A handful of azolla (Photo: Telma Sibanda, CIMMYT)
Often referred to as “green gold,” Azolla is a small, free-floating and fast-growing aquatic fern with immense potential in driving towards agriculture sustainability. Thriving in waterlogged environments, this hardy plant forms a symbiotic relationship with nitrogen-fixing cyanobacteria, making it a natural fertilizer for crops like rice. Rich in protein, Azolla is also an affordable, eco-friendly feed for livestock and fish, reducing reliance on commercial alternatives. Its rapid growth and carbon sequestration capabilities contribute to climate resilience and resource efficiency. The water in the pond is enriched with nitrogen and can be used to irrigate plants/crops, increasing its value to farmers. Farmers in low-income regions are embracing Azolla as a game-changer, unlocking opportunities to boost productivity, improve soil health, and transition toward more sustainable farming practices.
Recognizing Azolla’s potential, the CGIAR-funded Transformational Agroecology across Food, Land, and Water Systems Initiative, also known as the Agroecology Initiative (AEI) in Zimbabwe, is integrating it into agroecological approaches in Murehwa. This initiative, which operates through five work packages (WPs), is reimagining farming systems by combining innovative business models (WP3) with agroecological technologies (WP1).
Chicken fowl run in Murehwa, (Photo: Loveness Mudarikwa, CIMMYT)
In one of the districts in Murehwa, AEI Zimbabwe selected poultry business model working in collaboration with Hamara Chicks, focusing on resilient and dual-purpose Sasso chickens. Known for their resistance and ability to free-range, these chickens provide both meat and eggs, offering farmers diversified income streams. Hamara Chicks implemented a two-stage model: first the brooding stage, where farmers raise chicks up to four weeks old and then sell them to other farmers who raise them from juveniles to maturity. While promising, the first cycle faced challenges, including a lack of affordable, nutritious feed, and difficulties in securing a market post-brooding and after maturity. To address these issues, WP1 and WP3 identified Azolla as a potential supplemental or alternative feed to support the poultry business model.
The dilemma of Azolla: Two sides of the coin
Azolla farming offers a compelling mix of benefits for sustainable agriculture. Environmentally friendly and resource-efficient, Azolla farming requires minimal land, water, and inputs, making it particularly suitable for small-scale farmers seeking cost-effective solutions. Its rapid growth is one of its standout attributes; under optimal conditions, Azolla can double its biomass in just 3-5 days. This rapid growth allows farmers to produce significant quantities of forage with limited investment, significantly reducing feed costs and increasing overall profitability. Its ability to be harvested daily ensures a consistent and reliable feed supply.
Nutritionally, Azolla is a powerhouse. With a protein content of 25-30% (dry weight), it is packed with essential amino acids, vitamins such as A, B12, and beta-carotene, and essential minerals. When incorporated into livestock and poultry diets, Azolla contributes to improved health, faster growth rates, and better production results. For smallholder poultry farmers, these benefits translate into tangible gains in meat and egg production, providing a pathway to higher incomes. Moreover, Azolla’s agricultural utility extends beyond animal feed. Its nitrogen-fixing capability enriches soil fertility, reducing reliance on synthetic fertilizers and supporting sustainable crop production systems.
However, as promising as Azolla is, its cultivation is not without challenges. Water availability is a critical requirement, posing a potential barrier in regions with limited water resources. In Murehwa, Zimbabwe, where the CGIAR-funded Transformational Agroecology Initiative is promoting Azolla, horticulture farmers already have access to reliable water sources, alleviating this concern.
Another challenge is the maintenance of Azolla ponds. To thrive, Azolla requires well-managed conditions, including optimal pH levels and nutrient balance. Poorly maintained ponds can compromise growth and productivity. Recognizing this, farmers participating in the initiative have received extensive hands-on training to effectively manage and sustain these conditions effectively, ensuring that Azolla remains a viable and productive resource.
Empowering farmers through training and capacity building
The initiative partnered with KDV Consultancy to train 70 farmers, including 40 women in Murehwa, equipping them with essential skills for Azolla cultivation. The training sessions focused on pond construction, maintenance, and integration of Azolla into poultry feeding systems. This hands-on approach ensures that farmers can sustainably enhance their poultry value chains.
Training in progress in Murewa (Photo: Dorcas Matangi/CIMMYT)Training in progress in Murewa (Photo: Dorcas Matangi/CIMMYT)Training in progress in Murewa (Photo: Dorcas Matangi/CIMMYT)Training in progress in Murewa (Photo: Dorcas Matangi/CIMMYT)
By co-designing solutions with farmers, the initiative prioritizes their needs and challenges, and promotes practical, farmer-driven outcomes. Empowering farmers with the knowledge and tools to implement sustainable practices not only strengthens their resilience but also enhances the long-term sustainability of poultry production in Murehwa. This collaborative effort is laying the groundwork for a more robust and adaptive agricultural future.
The integration of Azolla farming represents a promising step towards achieving a more sustainable and resilient agricultural system in Murehwa. By addressing the feed challenges faced by poultry farmers, Azolla not only enhances poultry production but also contributes to the broader goals of food security and economic stability in the region. As the Transformational Agroecology across Food, Land, and Water Systems project progresses, the positive impacts of innovative practices like Azolla farming continue to support the well-being and livelihoods of farmers in Murehwa.
This image illustrates one of the SCASI’s practices – mulching – in the Wolaita Zone. Mulching is key to improving soil health, conserving moisture and increasing crop productivity in sustainable agriculture (Photo: CIMMYT)
Ethiopia faces increasing challenges from climate change, including erratic rainfall, soil erosion and longer dry seasons. With a rapidly growing population of more than 120 million, the country’s agricultural systems and natural resources are under considerable pressure. To address these challenges, the Scaling Conservation Agriculture-based Sustainable Intensification (SCASI) project, launched in March 2022 and implemented by CIMMYT and CFGB networks with the financial support from the Development Fund of Norway, offers a promising solution. SCASI integrates Conservation Agriculture-based Sustainable Intensification (CASI) practices to improve productivity while conserving natural resources.
The SCASI initiative is an exemplary model of how holistic agricultural approaches can enhance crop productivity, improve soil health, and build resilience to climate change in Ethiopia. Here’s an overview of the project’s key components and impacts.
Key components of CASI
CASI is a comprehensive production system in which conservation agriculture (minimum tillage, covering the soil surface with mulch and use of cereals and legumes in the form of intercropping or crop rotation) is combined with improved seeds, application of recommended organic and inorganic fertilizers, use of best management practices (recommended seed rate, timely weeding, proactive pest management, etc.) to increase productivity per unit area while improving the health of the production environment (soil, climate, fauna and flora and biodiversity). CASI also includes practices that help optimize the mixed crop-livestock systems by reducing the competition for crop residues through the promotion of alternative fodder crops, alley cropping, agroforestry and other locally adapted innovations.
Implementation across Ethiopia
Targeted Regions: The initiative was implemented in eight districts in the Amhara, Oromia, Benishangul-Gumuz, and South Ethiopia regions, each with unique agricultural contexts.
Direct Impact: Approximately 15,000 households (more than 75,000 smallholder farmers) have directly benefited, been capacitated, and gained access to sustainable practices that improved their productivity and livelihoods.
Partnership: Creates a unique partnership between national institutions, international organizations, and NGOs to support and strengthen national capacity to demonstrate and scale up CASI practices. Implements a collaborative and inclusive process in which partners contribute based on their expertise, capacity, and thematic focus.
How do we implement SCASI?
This is a well-managed plot in Baro village, Ura district, illustrates the key components of the SCASI project in Benishangul Gumuz. The effective implementation of sustainable agricultural practices is evident, reflecting the positive impact on productivity, diversification and soil health (Photo: CIMMYT)
The SCASI project uses an approach that integrates collaborative partnerships, with CIMMYT leading action research, the Ministry of Agriculture and regional offices aligning policy, and NGOs (CFGB, FHE, TDA, MSCFSO) engaging communities. It is supported by a comprehensive implementation framework that includes large-scale demonstrations to illustrate the benefits of CASI, action research to adapt practices to local needs, and capacity building to empower farmers and stakeholders for sustainable adoption and scalability.
CIMMYT’s researchers, provide action research findings that highlight the multifaceted approach of the SCASI initiative, which focuses on context-specific solutions to improve agricultural productivity and sustainability in Ethiopia. Birhan Abdulkadir, SCASI project leader and agronomist at CIMMYT, said, “We conducted a comprehensive participatory assessment to identify the major production constraints in the 40 kebeles and developed site-specific packages from the combinations of CASI practices. These were implemented in mega demonstrations on host farmers plots with close support from CGFB networks and BoAs. We facilitated access to inputs and provided technical backstopping.”
The project also uses farmer-centered approaches to promote the practices. Host farmers train other farmers and share knowledge and skills through farmer field schools (FFS), self-help groups (SHG), various farmer social networks and media. All these scaling efforts are coherent, inclusive and effective in different contexts and have played a crucial role in catalyzing the adoption and scaling up of CASI practices over the past nearly three years.
The merits of SCASI
The SCASI project has had a significant impact in Ethiopia, particularly in helping farmers improve productivity and soil health. As evidence of the project’s effectiveness in addressing the challenges farmers face, Birhan Abdulkadir noted that by adopting minimum tillage and using crop residues as mulch and compost, among other recommended practices, farmers have dramatically increased their maize yields. This approach not only improves productivity and soil health but also saves time on weeding and reduces production costs.
In August 2024, a delegation of donor representatives and implementing partners visited the Benishangul Gumuz Region and Wolaita Zone for a joint monitoring and evaluation field visit. This visit provided valuable insights into the impact of the project in Ethiopia. Interacting with technology adopters and government partners, the team observed positive results and encouraging examples of how the project is improving agricultural practices. These interactions highlighted the benefits of the interventions, reinforcing the project’s effectiveness in improving farmers’ livelihoods and promoting sustainable practices in the region. In total, 3,700 hectares of agricultural land in the Asosa zone are now using SCASI, demonstrating the project’s widespread impact.
Mr. Bobeker Holeta, Head of the Benishangul Regional State Bureau of Agriculture, emphasized the commitment to understanding the SCASI project over the past two years. He highlighted its effectiveness as a sustainable to improve farmers’ food security and climate resilience. As a result, the regional government has decided to expand the use of this technology to cover 50% of the region’s agricultural land. He believes this decision is an important step in supporting farmers and transforming the agricultural system, ultimately leading to a more resilient and productive agricultural landscape.
Mr. Beshir Hitman, a host farmer from Asosa Zone in Akendo Afafri village, has experienced significant benefits from adopting SCASI technology. Starting with just 0.4 hectares two years ago, he has now expanded his operations to 2.5 hectares. Previously, farmers relied on broadcasting and multiple tillage systems, which were effective but labour intensive. Mr Hitman points out that the SCASI methods have not only improved his crop production and productivity but have also saved him time and labor by minimizing weeding.
In Asosa zone, Ura District, Baro Village, farmer Rawda Mustefa stands proudly on her SCASI project plot. Her successful adoption of sustainable practices demonstrates the positive impact on her farming results (Photo: CIMMYT)
The thriving maize fields of farmer Fantan Karamala in Dunga Arumela village, Ura district, Asosa zone illustrate the effectiveness of the SCASI project. Her commitment has resulted in an impressive six quintals increase in maize yield. By incorporating mulching with crop diversification and expanding her demonstration to 2 hectares, she has successfully intercropped soybean with maize, significantly increasing her income.
Farmers in the Wolaita zone are also inspired by the principles and benefits of SCASI technology. Many have adopted sustainable practices that enhance productivity and improve soil health. The positive impact on yields and incomes has motivated these farmers to adopt innovative approaches, fostering a community-wide commitment to resilience and food security. Their shared experiences highlight the transformative potential of technology in their farming practices.
Farmer Adanech Bebiso in the Boloso Sore district of Wolaita Zone beams with joy as she reaps multiple benefits from her small plots of land managed under the SCASI project. Her positive experience reflects the transformative impact of sustainable agricultural practices on her livelihood (Photo: CIMMYT)
Adanech Bebiso shared her experience, stating, “We began using SCASI after the training we received in 2021. Along with inputs like improved seeds, ginger, taro, sweet potatoes, and forage plants, we also received regular technical support. Previously, using conventional techniques yielded minimal results for many years. SCASI has transformed our operations, and we are reaping the benefits. I started with a 60x40m plot, and my maize harvest increased dramatically from 6 to 16 quintals. This farm has improved our lives in many ways, and we are truly benefiting from this endeavor.”
The reduction of multiple tillage and the production of organic fertilizers, such as vermicompost, have empowered women to become more actively involved in farming. In addition, the availability of fodder has opened up new opportunities for farmers, allowing them to explore alternative businesses such as livestock fattening and dairy production. Many farmers are replacing local cows with improved varieties to enhance milk production and dairy quality.
These changes not only improve the farmers’ livelihoods but also foster social cohesion and build economic capital within the community. For example, the establishment of Self-Help Groups (SHGs) has become a valuable platform for technology transfer, financial savings, and access to credit, further supporting their agricultural and business endeavors.
Host farmers like Amarech Koricho play a key role in their communities by sharing their knowledge. She has trained around 50 fellow farmers in her area about SCASI practices. As a result, these farmers are thriving and actively adopting CASI practices to improve their land management and crop production. Their collective efforts are having a significant impact on sustainable agriculture in the region.
During the joint monitoring visit facilitated by CIMMYT, Tilahun Tadesse, Program Manager of the Terepeza Development Association (TDA), emphasized the advantages of the SCASI approach. He noted that farmers wereexperiencing higher yields per hectare and greater resilience during droughts compared to conventional methods. He attributed the success of these trials to farmers’ commitment, progressive learning, and increased awareness. The variety ofcrops grown onthe demonstration plots are producingimpressive results, further demonstratingthe effectiveness of the SCASI project.
Lessons and future directions
Action research conducted over two years in four regions of Ethiopia highlights the potential of SCASI to drive agricultural transformation. By integrating conservation agriculture with sustainable intensification principles, it effectively addresses immediate agricultural challenges while building resilience to the impacts of climate change. This initiative goes beyond increasing agricultural productivity and improving soil health; it also promotes the expansion of social capital and strengthens system resilience. The practices have effectively reached rural communities through various channels, including radio, demonstrating that targeted, long-term promotion efforts increase the uptake of CASI. The tangible successes experienced of early adopters motivate non-adopters to join the movement. Additionally, host farmers play a crucial role in cascading knowledge and practices to their peers, further facilitating the scaling up of CASI practices. By combining sustainable farming practices with community-based solutions, SCASI empowers farmers to overcome collectively address challenges.
Looking ahead, a sustained commitment to institutional capacity building, the integration of CASI-friendly policies into regional and national frameworks, and effective resource mobilization will be critical to sustaining the momentum of SCASI and expanding its benefits throughout Ethiopia. By expanding the initiative’s reach, CIMMYT and its partners aim to foster a more resilient, productive and sustainable agricultural future that adapts to the country’s diverse agro-ecological conditions. This collective effort will not only improve food security but also empower communities to thrive in the face of climate challenges.
Participants attended the opening ceremony at NAS Complex in New Delhi (Photo: CIMMYT)
CIMMYT, the Borlaug Institute for South Asia (BISA), and the Indian Council of Agricultural Research (ICAR) jointly organized a three-week training course on conservation agriculture (CA) and regenerative agriculture (RA). The program focused on the potential of sustainable farming methods as vital tools for managing risks in agrifood systems in both irrigated and rainfed areas.
Held from December 3–23, 2024, the training brought together farmers, scientists, and stakeholders to explore innovative solutions to agrifood challenges. Sessions were held at the ICAR Indian Institute of Maize Research and BISA in Ludhiana, Punjab; the ICAR-Central Soil Salinity Research Institute in Karnal, Haryana; and the ICAR-Indian Institute of Farming Systems Research in Meerut, Uttar Pradesh, India.
Building Resilient Agrifood Systems
Conservation agriculture (CA) and regenerative agriculture (RA) are approaches to land management that prioritize ecosystem health. These practices are based on three core principles: minimal soil disturbance, continuous soil cover, and crop diversification. Together, they improve yields, restore natural resources, reduce farming costs, and develop resilient agricultural systems that protect the environment, enhance climate resilience, and improve rural livelihoods, particularly in the Global South.
In South Asia, where rural communities rely heavily on natural resources, farmers face significant challenges, including loss of soil fertility, water scarcity, pollution, and the effects of climate change. These pressures are straining agricultural systems, particularly in irrigated and dryland farming areas.
Despite the clear benefits of CA, adoption remains limited due to barriers such as lack of knowledge on how to implement CA in different agro-ecologies, limited access to appropriate tools, insufficient policy support, and low awareness of the long-term benefits of CA. To address these challenges, training and capacity development are essential for scaling up CA technologies among smallholder farmers and ensuring their long-term impact.
The Advanced Course on CA/RA in Asia was launched in 2010 by CIMMYT in partnership with the Indian Council of Agricultural Research (ICAR) to address the challenges of sustainable agriculture. Since its inception, advanced training workshops have been held annually, and this is the 13th edition.
The training bridges cutting-edge scientific research and multidisciplinary strategies, equipping participants with skills in sustainable intensification, diversification of production systems, resilience-building, and natural resource conservation. To date, CA training has benefited more than 220 researchers, policymakers, and development practitioners from 20 countries.
The 13th edition, held in India, welcomed mid-career researchers from Uzbekistan, Morocco, and India. The course was coordinated by Mahesh Gathala, Cropping Systems Agronomist, and Alison Laing, Agroecology Specialist, both from CIMMYT; Madhu Choudhary, Senior Scientist at ICAR-CSSRI; and Raj Kumar Jat, Senior Scientist at BISA.
Key Highlights of the Advanced Conservation Agriculture Training Course
The Advanced Conservation Agriculture (CA) course was inaugurated on December 4, 2024, at the NASC Complex in New Delhi. The inaugural address was delivered by S.K. Chaudhari, Deputy Director General for Natural Resource Management at ICAR, who highlighted the importance of CA in addressing climate challenges and managing agronomic risks. Chaudhari emphasized CIMMYT’s leadership in promoting CA in India and reflected on the impact of the program, saying, “I have been watching this course for many years. Many young scientists have benefited from this course.” He also fondly recalled the inaugural training session held 13 years ago and extended his best wishes to all the participants. Watch his complete statement here.
Participants experiencing hands-on training at the BISA farm in Ludhiana.
During the course, participants explored a wide range of topics related to conservation agriculture (CA) and regenerative agriculture (RA) in different agro-ecologies. Key areas of focus included the role of emerging technologies such as drones, carbon credits, soil fertility, nutrient management, crop modeling, and soil testing in informing policy. Experts from various scientific disciplines provided valuable insights into cutting-edge research for both irrigated and dryland systems.
At BISA’s research station in Ludhiana, participants gained practical experience through hands-on training sessions conducted under the expert guidance of H.S. Sidhu and Manpreet Singh (both from Punjab Agricultural University), with the support of Pardeep Sangwal (BISA).
Participants learning new techniques at CSSRI, Karnal (Photo: CIMMYT)
The training included field visits to ICAR-CSSRI in Karnal, where Director R.K. Yadav, Madhu Choudhary, and Kailash Prajapat presented the Institute’s long-term conservation agriculture (CA) experiments. They also conducted hands-on demonstrations on soil biology and its role in generating evidence for policy decisions.
In addition, Mahesh Gathala conducted hands-on training in basic soil physical and chemical analysis techniques at joint ICAR-CIMMYT field plots in Karnal.
Special visits were organized to innovative agricultural machinery manufacturers, including Landforce and National Agroindustry, where participants observed advanced manufacturing techniques and explored the latest agricultural equipment.
Participants also interacted with the manufacturers’ association at the 5th India International Agri Expo in Ludhiana, gaining insights into emerging trends in agricultural machinery.
Participants visited the National Agro manufacturing unit in Ludhiana, Punjab (Photo: CIMMYT)
In addition, a village visit outside Karnal gave participants the opportunity to interact with farmers practicing conservation agriculture (CA). Farmers shared their experiences, giving participants a first-hand look at the practical benefits and real-world impact of CA on farming communities.
A visit to Golden Temple in Amritsar, Punjab (Photo: CIMMYT)
The success of the program underscores the importance of continued collaboration and training in advancing sustainable agricultural practices. By equipping participants with practical skills, cutting-edge knowledge, and opportunities to connect with peers across regions, the training was instrumental in advancing conservation agriculture (CA) and regenerative agriculture (RA).
Participants left the program with enhanced technical expertise, greater confidence in applying CA practices, and valuable insights into emerging areas such as carbon credit schemes and innovative agricultural technologies. These results underscore the critical role of capacity development in strengthening food security, building climate resilience, and promoting sustainable development in the Global South.
CIMMYT-ICAR Workshop on Long-Term Agricultural Experiments (Photo: CIMMYT)
CIMMYT and the Indian Council of Agricultural Research (ICAR), New Delhi, co-hosted a one-day workshop on Long-Term Experiments (LTEs) in agriculture, focusing on Conservation Agriculture (CA) and Regenerative Agriculture (RA) practices. The workshop aimed to explore strategies for researchers from the national systems to come together with CIMMYT colleagues and identify ways to increase productivity, improve food security, strengthen climate resilience of agricultural systems, and enable Indian farmers and researchers to take advantage of innovations and new research in LTEs.
The event was chaired by Dr Suresh Kumar Chaudhari, Deputy Director General for Natural Resource Management at ICAR. In his remarks, Dr Chaudhari highlighted the critical role of LTEs in understanding evolving agri-food systems. He emphasized the value of revisiting past research with fresh perspectives, taking into account new knowledge, and taking a long-term, strategic view of our agricultural research portfolios.
Dr. Prasanna Boddupalli, Regional Director for South Asia – CIMMYT, highlighted the importance of LTEs in generating knowledge for sustainable practices. He expressed hope that the workshop would inspire innovative ideas, such as the use of climate-resilient crop varieties like drought- and heat-tolerant maize, and the use of predictive analytics and machine learning to identify emerging trends
Dr Alison Laing chaired the workshop. She outlined the objectives of the workshop and emphasize the importance of collaborative discussions in formulating guidelines and recommendations for ongoing and future experiments on CA and RA. She also highlighted the need for resource mobilization and contributions from the participating institutions.
The opening session featured presentations by senior scientists, including Dr M.L. Jat (ICRISAT), Dr Rajbir Singh (ICAR-NRM ADG), Dr Rakesh Kumar (ICAR-RCER), Dr Madhu Choudhary (ICAR-CSSRI), Dr H.S. Jat (ICAR-IIMR) and Dr C.M. Parihar (ICAR-IARI). They provided insights into ongoing LTEs on CA and RA at their research institutions, including key research foci, discussed challenges and opportunities, and stressed the importance of ensuring the continuity of LTEs in the face of shifting priorities and donor fatigue.
All participants then engaged in group discussions to address emerging priorities, funding challenges and barriers to implementation, and to identify ways in which LTEs can generate data to demonstrate the long-term impacts of agricultural practices and the performance of different cropping systems. These breakout sessions culminated in a plenary session where participants consolidated key issues and reached consensus on actionable recommendations.
Dr Laing concluded the workshop by announcing that the recommendations would be compiled into a joint document to be submitted to ICAR-NRM, providing a roadmap for strengthening LTEs in India.
In his vote of thanks, Dr Mahesh Gathala (CIMMYT) commended the participants for their valuable contributions to the objectives of the workshop’s. He expressed confidence in the collective commitment of scientists and institutions – public and private – to the advancement of LTEs and their critical role in strengthening agricultural and food system science and research.
Soils are the bedrock for plant health and sustenance, but how do we protect and enhance them to maximize their nutritional potential? Years of conventional farming practices have left many soils depleted, raising urgent concerns about how to rejuvenate them. The recent El Niño event during the 2023/24 farming season in southern Africa, bringing extreme weather conditions—ranging from prolonged droughts to intense floods—has exposed the vulnerability of these soils. Poorly managed soils, already strained by years of excessive tillage and lack of cover, struggle to retain moisture under such stress, leading to crop failures even after rainfall.
However, conservation agriculture (CA) offers a vital solution. By improving soil structure and moisture retention, CA practices provide a lifeline for crops in challenging conditions. Recognizing this, CIMMYT scientists are actively promoting CA among smallholder farmers across sub-Saharan Africa, highlighting its critical role in sustaining soil health and resilience in the face of climate challenges.
Described as lumps of soil particles that bind together strongly, soil aggregates play a vital role in maintaining soil health, supporting plant growth, and sustaining agricultural productivity. Formed by the combined effects of biological, chemical, and physical processes, the structure and stability of soil aggregates are crucial for several soil functions—primarily water infiltration, root growth, and resistance to erosion. Soil aggregates consist of various soil particles, including sand, silt, clay, and organic matter. There are different types of soil aggregates, including macroaggregates (>0.25 mm) and microaggregates (<0.25 mm), with macroaggregates typically more stable and beneficial for soil structure and functions.
Demonstrating the value of soil aggregate stability
A CIMMYT researcher holding a soil aggregate from a CA field (CIMMYT)
Imagine three soil aggregate samples taken from the same field but under different management regimes—from virgin soil that has not been previously cropped, to land under conservation agriculture practices for the last 5 to 8 years, and soil conventionally ploughed annually before crop planting for many years. When these soil aggregates are gently immersed in clear water, stark differences can be noted. The aggregates from conventionally tilled soil, weakened by years of intensive cultivation, quickly disintegrate, turning the water murky and brown.
In contrast, the aggregates from virgin soil remain intact, preserving the water’s clarity even after several hours. The CA soil aggregates exhibit much better stability than those from the conventionally tilled soil but fail to remain as intact as those from the natural virgin soil. A simple lesson is drawn from this demonstration! Restoring degraded soils is a serious challenge. Even after 5 years of CA practices, soil organic carbon levels may only show modest improvement, and the aggregates, while more stable, still don’t match the condition of aggregates from virgin soil.
Soil recovery from a degraded state is a slow process that is not “a walk in the park.” Transitioning from conventional tillage to CA is challenging and slow, requiring years to rebuild organic matter and improve aggregate stability. Patience and careful soil management are vital, as degradation can occur rapidly, but recovery is a lengthy process. However, incorporating organic soil amendments like manure and compost, along with diversifying crops by introducing legumes such as cowpea, groundnut, soybean, mucuna, and pigeon pea, can accelerate this recovery. While degradation occurs rapidly, soil restoration demands a long-term commitment, but the rewards are worth the effort.
Exploring conservation agriculture as a source to improve soil health
Conservation agriculture is built on three key principles: reduced soil disturbance, permanent soil cover, and diverse crop rotation. Minimizing soil disturbance helps preserve soil structure, while permanent soil cover shields the soil against splash erosion and boosts microbial activity. Crop rotation enhances soil fertility, maintains aggregate structure, and disrupts pest and disease cycles. These principles are essential for soil recovery and the retention of organic matter.
Among these, permanent soil cover is often the most challenging for farmers to implement, yet it is critical for effective soil management. Demonstrating its importance, a simple test with water applied to soil samples with varying levels of cover illustrates splash erosion effects.
“Such a simple test mimics real-life conditions farmers face during rains. Soils without cover suffer significant erosion, while those with minimal or substantial cover show reduced erosion and improved water retention. This emphasizes the importance of maintaining permanent soil cover to foster microbial activity and enhance soil health,” highlighted Isaiah Nyagumbo, cropping systems agronomist.
In a nutshell, soil aggregate management is fundamental to climate resilience and agricultural sustainability. Through the adoption of conservation agriculture practices, smallholder farmers can significantly improve soil health, enhance water and nutrient retention, and increase crop resilience to climate stress. The journey from degraded to healthy soil is long and challenging, but with careful management and patience, the benefits are profound and lasting. By understanding and implementing these principles, farmers can build a more sustainable and resilient food system.
While agricultural food systems feed the world, they also account for nearly a third of the world’s greenhouse gas (GHG) emissions. Reducing the negative environmental footprint of agrifood systems while at the same time maintaining or increasing yields is one of the most important endeavors in the world’s efforts to combat climate change.
One promising mechanism is carbon credits, a set of sustainable agricultural practices designed to enhance the soil’s ability to capture carbon and decrease the amount of GHG’s released into the atmosphere.
Farmers generate these carbon credits based on their reduction of carbon released and then sell these credits in the voluntary carbon market, addressing the critical concern of sustainably transforming agricultural systems without harming farmers’ livelihoods.
Two is better than one
Conservation Agriculture (CA) is a system that involves minimum soil disturbance, crop residue retention, and crop diversification, among other agricultural practices. Its potential to mitigate threats from climate change while increasing yields has made it increasingly popular.
Using remote sensing data and surveys with farmers in the Indian states of Bihar and Punjab, four CIMMYT researchers quantified the effect on farmer’s incomes by combining CA methods with carbon credits. Their findings were published in the April 22, 2024, issue of Scientific Reports.
Previous CIMMYT research has shown that implementing three CA practices: efficient fertilizer use, zero-tillage, and improved rice-water management could achieve more than 50% of India’s potential GHG reductions, amounting to 85.5 million tons of CO2.
“Successfully implemented carbon credit projects could reward farmers when they adopt and continue CA practices,” said Adeeth Cariappa, lead author and environmental and resource economist at CIMMYT. “This creates a win–win scenario for all stakeholders, including farmers, carbon credit businesses, corporate customers, the government, and the entire economy.”
Farmers would enjoy an additional income source, private sectors would engage in employment-generating activities, the government would realize cost savings, and economic growth would be stimulated through the demand generated by these activities.
Less carbon and more income
The researchers found by adopting CA practices in wheat production season, farmers can reduce GHG emissions by 1.23 and 1.97 tons of CO2 per hectare of land in Bihar and Punjab States, respectively.
The researchers determined that CA practices, when combined with carbon credits, could boost farmer income by US $18 per hectare in Bihar and US $30 per hectare in Punjab. In Punjab, however, there is a ban on burning agricultural residue, which reduces potential earnings from carbon markets to US $16 per hectare.
“More farmers engaging CA methods is an overall positive for the environment,” said Cariappa. “But convincing individual farmers can be a struggle. By showing them that carbon credits are another potential source of income, along with increased yields, the case for CA is that much stronger.”
While the potential benefits are significant, there are challenges to linking CA and carbon credits.
“To achieve these potential benefits, carbon credit prices must rise, and projects must be carefully planned, designed, monitored, and implemented,” said Cariappa. “This includes selecting the right interventions and project areas, engaging with farmers effectively, and ensuring robust monitoring and implementation mechanisms.”
Local farmers have conversations with the CGIAR Initiative on Agroecology partners in Zimbabwe during the co-designing process. (Photo: CIMMYT)
In the rural districts of Mbire and Murehwa in Zimbabwe, the CGIAR Agroecology Initiative (AE-I) has embarked on a comprehensive strategy that places farmers’ opinions at the heart of interventions to tackle the multifaceted challenges of agroecosystems. Recognizing challenges such as pest and disease outbreaks, periodic drought, inadequate grazing lands, and limited access to quality seeds and livestock breeds, the AE-I team has initiated a collaborative process involving various stakeholders to develop tailored agroecological solutions.
This integrated approach emphasizes active participation and cooperation among agricultural extension services, including the Department of Agricultural Technical and Extension Services of Zimbabwe (AGRITEX), food system actors (FSAs), and technology providers. These organizations have collaborated to form Agroecology Living Landscapes (ALLs) to identify, test, and iterate relevant innovations.
“This collaborative innovation and ongoing co-designing cycle empower local communities and fosters agricultural sustainability, positioning Zimbabwe as a model for agroecology transition,” said Vimbayi Chimonyo, CIMMYT scientist and crop modeler. “With these efforts, the AE-I is improving current agricultural practices but also building a foundation for future resilience in Zimbabwe’s rural districts.”
A representation diagram of the co-designing cycle.
To ensure a well-informed process, the AE-I research team began its efforts by identifying dominant value chains in the two districts. In Murehwa, these included horticulture, maize, groundnuts, and poultry; while in Mbire, sorghum, cotton, and livestock. Challenges noted included production constraints (availability of improved seed and labor), biophysical constraints (water availability, increased incidents of fall armyworm), economic (market access) and social (agency).
Next, the AE-I research team, and the ALLs conducted a series of surveys, focus group discussions, and key informant interviews to understand existing opportunities that might address the challenges and aid in strengthening the value chains. The AE-I team discovered opportunities related to addressing labor shortages and improving access to improved technologies.
As a result, the research team introduced appropriate scale machinery, suggested seed and livestock fairs to increase access to agroecological inputs, established a series of demonstration plots to showcase technologies that improve water use, and increased mitigation efforts for fall armyworm. After introducing machinery, seed and livestock fairs, and testing the technologies during the 2022/23 season, AE-I returned to ALL members to discuss the impact the activities had on their production systems and determine if any modifications were necessary.
Participants suggested increased visibility of the new technologies and methods, so the AE-I team enhanced demonstration plots and added 100 baby plots during the 2023-24 farming season.
Integrating adaptive testing and feedback yielded valuable information from farmers, providing a strong base for further adaptations in the 2023-24 farming season. This continuous engagement promoted adaptive and context-specific solutions within the AE-I, ensuring that interventions aligned with evolving community needs.
Technologies being tested
To achieve the visions of each ALL, context-specific technologies are being tested to ensure synergy across the identified value chains and collaboration among different food system actors.
Technology/Innovation
Description
Demo plots
2022-23: Twenty mother plots were established to compare the performance of cereal planted in, push-pull, and conventional practices on productivity, rainwater use efficiency, and pest biocontrol.
2023-24: Additional treatments, including biochar, live mulch, and traditional treatments, were introduced. One hundred eleven baby plots were established where farmers adapted mother protocols to suit their contexts.
Farmer Field Days
Conducted for the established demonstration plots in Mbire and Murehwa, these field days showcased the technologies to a broader audience and acted as an agent of evaluation and feedback for the AE-I team.
Mechanization
A service provider model was adopted to introduce appropriate scale machinery, addressing the drudgery associated with farming operations. Equipment provided included threshers, basin diggers, two-wheel tractors, rippers, mowers, chopper grinders, and balers. Training on operation, repair, and maintenance was also provided.
Capacity building
Yearly work plans, co-designed by ALLs, identification of training needs, gaps, and priorities. Facilitated by AGRITEX, these trainings equip farmers with knowledge essential to facilitate agroecology transition and fulfil ALL visions.
Monitoring and evaluation is a valuable component in the co-designing process where the AE-I establishes a feedback loop, engaging farmers and government stakeholders in participatory monitoring and evaluation. This ongoing exercise analyzes various indicators across different experimental treatments, providing valuable insights into the effectiveness and suitability of these approaches within the agricultural context. This continuous analysis leads to further co-designing of tailored solutions for facilitating the agroecology transition.
Farmers and stakeholders from AGRITEX welcomed and appreciated the co-designing process, as they felt empowered by the entire process. They expressed how it gives them ownership of the technologies being implemented through the AE-I project.
The success of the AE-I in the Mbire and Murehwa districts hinges on active participation and collaboration among FSAs. By continuously evaluating and integrating feedback on innovations and addressing challenges through context-specific interventions, the initiative is paving the way for adopting agroecological practices in farming, enhancing the resilience of local food systems.
This original piece was written by Craig E. Murazhi, Telma Sibanda, Dorcas Matangi, and Vimbayi G. P. Chimonyo.
Twenty-twenty four is set to become one of the hottest years on record. Warmer temperatures are destabilizing ecosystems, threatening human life, and weakening our food systems. On Earth Overshoot Day, CIMMYT calls for increased attention to the interplay between environmental health and efficient, abundant food production through sustainable practices.
Food systems are one of the top contributors to greenhouse gas (GHG) emissions, accounting for one-third of all human-caused GHG emissions. While contributing to climate change, food production is also sorely impacted by it, undermining agrarian livelihoods and the ability to feed an increasing global population. Extreme and unpredictable weather is causing economic hardship, food and nutrition insecurity, and use of environmentally harmful practices.
In the Western Indo-Gangetic Plains of India, rice and wheat are the dominant staple crops, grown yearly in rotations covering more than 13 million hectares. But conventional tillage-based methods have been unable to increase yields. Some of these traditional methods based on intensive tillage have harmed the soil, exhausted aquifers, and increased GHG emissions, without raising crop yields. CGIAR soil and climate scientists and agronomists have partnered to find solutions that help increase rice and wheat production, while minimizing harmful environmental effects.
One of the CA-based practice research fields at ICAR-CSSRI. (Photo: Nima Chodon/CIMMYT)
At CIMMYT, we interviewed a group of CGIAR scientists who recently published a long-term study on sustainable intensification in the Western Indo-Gangetic Plains. Their work, conducted at the Central Soil and Salinity Research Institute (ICAR-CSSRI) in Karnal, India, demonstrates how integrating Conservation Agriculture (CA)-based principles into cropping systems can support climate-resilient and sustainable food systems.
“Today, agriculture faces many challenges, such as increasing input costs to maintain yield in the face of climate change and ensuring the sustainability of agricultural land,” said Mahesh Gathala, senior scientist at CIMMYT.
He mentioned that the collaborative research spanned over eight years, covering various crops and cropping cycles, and studying seven scenarios representing different farming practices. One scenario was based on farmers’ existing practices, while the other six involved combining and integrating the agronomic management practices and crop diversification options based on CA principles. The team collected data on yield, profitability, soil health, global warming potential, and fertilizer use, to name critical factors.
Gathala highlighted, “The findings are consistent with our previous research conclusions, while reinforcing the significant compounding impact of Conservation Agriculture-based cropping practices in the region, in the long-run.”
According to M.L. Jat, a former CIMMYT scientist who is global director for ICRISAT’s Resilient Farm and Food Systems Program, the CA-based measures that emerged from this research are applicable in much of the Western Indo-Gangetic Plains and beyond.
“Most of our research trials over some 2-5 years have provided substantial evidence in favor of Conservation Agriculture-based cropping diversification and sustainable intensification,” Jat said. “However, this study is one of very few long-term, collaborative research trials that provide strong evidence for policy decisions on resilient, climate-smart cropping system optimization to boost yields and nutrition, while improving soil health and fighting climate change.”
Other lead authors of the publication, Timothy Krupnik, principal scientist at CIMMYT and CGIAR South Asia, and Tek Sapkota, the Climate Change Science lead at CIMMYT, provided further explanation of important lessons from this eight-year study.
Two CA-based practice research scenarios at ICAR-CSSRI. (Photo: Nima Chodon/CIMMYT)
How does CA contribute to the sustainable and conscious use of natural resources? In what ways could CA be framed to governments to develop policies that do a better job of feeding us nutritious food while contributing to climate change adaptation and mitigation?
Tek Sapkota: Conservation Agriculture promotes the production of nutritious, diversified crops, sustainable yield improvements, climate change adaptation, economic benefits, and environmental protection. Governments can support these initiatives through financial incentives, subsidies, investment in research and extension services, and the development of supporting infrastructure and market access. This support further enables farmers to implement and benefit from sustainable agricultural practices.
CIMMYT and CGIAR-led projects in South Asia, like CSISA/SRFSI/TAFFSA, have already recorded some wins for CA implementation. What are some immediate implications of this study on CIMMYT’s ability to deliver this knowledge to more smallholders in the region?
Timothy Krupnik: The ICAR-CIMMYT partnership establishes long-term experiments, or living labs, across diverse ecologies to build trust among smallholder farmers, extension workers, and stakeholders. These initiatives aim to demonstrate CA’s benefits, as part of sustainable intensification. The science-based evidence generated will be co-owned by partners, through their extension networks, and shared with farm communities to highlight CA’s advantages. Additionally, the study supports reducing carbon footprints, contributing to climate change mitigation and sustainable agricultural practices and potentially used by carbon market players to disseminate CA.
Apart from climate resilience, could you explain what are the economic benefits of diversification in the rice-wheat dominant systems?
Tek Sapkota: Diversifying away from rice-wheat cropping systems provides significant economic benefits beyond climate resilience. It enhances income stability, improves resource use efficiency, maintains soil health, reduces production costs (such as irrigation expenses and water usage), and opens up new market opportunities. Diversification contributes to the creation of more sustainable and profitable farming systems.
How can CGIAR and national agricultural research and extension systems promote more widespread adoption of these technologies by farmers in South Asia and beyond?
Tek Sapkota: By establishing a multi-stakeholder platform for learning, knowledge sharing, and developing adoption pathways, CGIAR Research Centers could work together with national partners to create programs that support capacity building and knowledge transfer. Another crucial step would be to collaboratively adapt and customize the technology to local production conditions ensuring smooth implementation at the grassroots level. Additionally, it is important to encourage innovations in policies, markets, institutions and financial mechanisms to facilitate scaling.
Florence Mutize’s thriving fields of maize, in Bindura, a small town in Mashonaland Central region of Zimbabwe, serve as living proof of the successes of Conservation Agriculture (CA), a sustainable cropping system that helps reverse soil degradation, augment soil health, increase crop yields, and reduce labor requirements while helping farmers adapt to climate change. The seeds of her hard work are paying off, empowering her family through education and ensuring that a nutritious meal is always within reach.
“I have been dedicated to these CA trials since 2004, starting on a small plot,” said Mutize. “Now, with years of experience and adaptation to changing climates, I’ve seen my yields increase significantly, harvesting up to a tonne of maize on a 30 by 30m plot using direct seeding and ripping techniques together with crop residue to cover the soil and rotating maize with soybean.”
Mutize is one of many mother trial host farmers implementing CA principles through the CGIAR Ukama Ustawi regional initiative in Bindura. A mother trial is a research approach involving testing and validating a suite of climate-smart agriculture technologies to identify the best-performing ones which can then be adopted on a larger scale.
Nestled in the Mazowe valley, Bindura experiences a subtropical climate characterized by hot, dry summers and mild, wet winters, ideal for agricultural production. But the extremes of the changing climate, like imminent dry spells and El Niño-induced threats, are endangering local farmers. Yet, smallholder farmers like Mutize have weathered the extremes and continued conducting mother trials, supported by the agriculture extension officers of the Agricultural and Rural Development Advisory Services (ARDAS) Department of the Ministry of Lands, Agriculture, Fisheries, Water and Rural Development.
“Where I once harvested only five bags of maize, rotating maize with soybeans now yields 40 bags of maize and 10 bags of soybeans,” Mutize proudly shares.
The UU-supported CA program also extends to farmers in Shamva, like Elphas Chinyanga, another mother trial implementer since 2004.
Elphas Chinyanga and his son inspect maize cobs in their field. (Photo: CIMMYT)
“From experimenting with various fertilization methods to introducing mechanized options like ripping and direct seeding, these trials have continuously evolved,” said Chinyanga. “Learning from past experiences, we have gotten much more benefits and we have incorporated these practices into other fields beyond the trial area. I am leaving this legacy to my children to follow through and reap the rewards.”
Learning has been a crucial element in the dissemination of CA technologies, with CIMMYT implementing refresher training together with ARDAS officers to ensure that farmers continue to learn CA principles. As learning is a progressive cycle, it is important to package knowledge in a way that fits into current training and capacity development processes.
Pre-season refresher training with mother trial host farmers and extension in Hereford, Zimbabwe. (Photo: CIMMYT)
This process could also be labelled as “scaling deep” as it encourages farmers to move away from conventional agriculture technologies. Reciprocally, scientists have been learning from the experiences of farmers on the ground to understand what works and what needs improvement.
Inspired by the successes of his peers in Shamva, Hendrixious Zvomarima joined the program as a host farmer and saw a significant increase in yields and efficiency on his land.
“For three years, I have devoted time to learn and practice what other farmers like Elphas Chinyanga were practicing. It has been 14 years since joining, and this has been the best decision I have made as it has improved my yields while boosting my family’s food basket,” said Zvomarima.
The longevity and success of the initiative can be attributed to committed farmers like Mutize, Chinyanga, and Zvomarima, who have been part of the program since 2004 and are still executing the trials. Farmer commitment, progressive learning, and cultivating team spirit have been the success factors in implementing these trials. CIMMYT’s long-term advocacy and learning from the farmers has been key to a more sustainable, resilient, and empowered farming community.
Walking methodologies for CIMMYT’s South Pacific hub (Photo: CIMMYT)
“We know about what CIMMYT has done with the hubs here in Mexico, so we’re trying to understand how this methodology works, what happens within the research platforms, in the parcels, the relationship between these two spaces, the technological menus, and how that menu is reaching up to farmers,” says Emmanuel Ekom, from the Ernest and Young team (organization which in the framework of Excellence in Agronomy, a CGIAR initiative) studies how innovation is rising in agriculture.
“We understand that CIMMYT in Mexico has been able to create an innovation approach that prioritizes the farmer. I came from Nigeria with my team, and we are delving ourselves into this approach to comprehend its functioning and see if we can replicate these brilliant ideas in several other countries of the Global South. So, we have visited many interesting hubs in all Mexico,” says Emmanuel.
“One of the most interesting things we were able to experience in one of the hubs was that the mayor from a small town was trained by CIMMYT staff. He understood what the agriculture conservation involves and had contributed to share this knowledge to his people”, mentions Emmanuel who also highlights the participation and inclusion from both private, public, and teaching institutions in the operation of the hubs.
“You could see their faces fill with excitement, especially farmer women when they were talking about how much time they could have saved if they had used the technology developed by CIMMYT and its collaborators. Such methodology is not only making life easier, but it’s also driving farmer women to increase their incomes and helping them save time so that they concentrate on other things. Just the same, I was able to see how the gender-based approach is coping with CIMMYT’s goal and that’s impressive”, says Emmanuel.
“I saw first-hand how the hubs’ function had made an impact on farmers lives, but the most interesting part was seeing both hubs’ managers and farmers get along very well. Every time we went to a parcel, our plan was to only visit one farmer but sometimes we ended up visiting 10 or 15, and the manager would go and chat with them. And I think that’s amazing”, says Emmanuel, for whom the experience of the hubs in Mexico will allow him to draw up the path to replicate this methodology in other latitudes.
CA in action at the farmer level. (Photo: Christian Thierfelder/CIMMYT)
For decades, smallholder farmers in Southern Africa have battled the whims of a changing climate—from withered crops to yield reductions and looming food insecurity concerns. And the outlook is not improving. Based on the latest available science, the sixth assessment report of the Intergovernmental Panel on Climate Change (IPCC) reaffirms the projected negative impacts of climate change on livelihoods in Southern Africa.
Conservation Agriculture (CA) has been considered as an important step to make smallholder farming systems climate smart and resilient. The principles of CA are simple yet potent: minimal soil disturbance, crop cover, and diverse rotations, which tend to have lasting implications on rebuilding soil health, conserving moisture, and nurturing a thriving ecosystem. A strong evidence base from on-farm and on-station trials show that CA has the potential to build the adaptive capacity and resilience of smallholder farming systems to climate stress.
Yet, despite the positive results, significant scaling gaps remain. Key questions arise on what can be done to turn the tide, scale, and encourage uptake. What institutional, policy and economic incentives would enable scaling? Could mechanization be the missing link? The Understanding and Enhancing Adoption of Conservation Agriculture in Smallholder Farming Systems of Southern Africa (ACASA) project responds to these questions. With funding from the Norwegian Agency for Development Cooperation (NORAD) and implemented by the International Institute of Tropical Agriculture (IITA), and CIMMYT, the ACASA project goes beyond the narrow focus on promotion and technology delivery of past and ongoing interventions on CA in Southern Africa.
ACASA was designed to help stakeholders gain deeper understanding of the interactions between the socio-economic, biophysical, and institutional constraints and opportunities for adoption of CA practices. To do this, the project has undertaken extensive surveys aimed at understanding incentives, drivers, and barriers of CA adoption across Zambia, Malawi, and Zimbabwe.
Dialogues for change
Participants from across the region during the reflective meeting. (Photo: CIMMYT)
In December 2023, CIMMYT collaborated with IITA and the Ministry of Lands, Agriculture, Fisheries, Water and Rural Development of Zimbabwe to convene a highly engaging, reflective, and learning meeting, with the participation of government representatives, the private sector, and research institutes, among others. The primary objective was to share valuable insights accumulated over years of research and development on conservation agriculture in southern Africa. These insights are a result of collaborative efforts in social science, scaling, and mechanization work by CIMMYT, IITA, and extension and research partners in Malawi, Zambia, and Zimbabwe. Conversations centered on tracing the historical pathway of CA, leveraging mechanization, and identifying key enablers to transform smallholder agriculture.
Tracing the pathway of conservation agriculture
For decades, CIMMYT has been a leading force in promoting Conservation Agriculture. From the early stages in the 1990s, CIMMYT introduced CA principles and practices through on-farm and on-station field days, to undertaking robust research on biophysical impacts and developing adapted technologies in collaboration with national and global partners. As this research progressed and matured, efforts were made to integrate and focus on understanding the social and economic factors influencing CA adoption, while recognizing the significance of enabling environments. To date, linkages with mechanization and other innovations promoting CA-friendly equipment have been strengthened, ensuring inclusivity and empowerment. Questions remain around policy and institutional innovations to nudge and sustain adoption. In a nutshell, there is scope to borrow tools and methods from behavioral and experimental economics to better study and facilitate behavioral change among smallholder farmers. This snapshot highlights global efforts, grounded in scientific evidence, farmer centric approaches, and collaborative partnerships.
Insights from the field
Described as a data and evidence driven process, a notable highlight was the detailed gathering and analytical efforts using a large multi-country household survey involving 305 villages and 4,374 households across Malawi, Zambia, and Zimbabwe. The main thrust was not only to harvest data but listen to farmers and better understand their context while deciphering their decision-making processes concerning CA adoption, across the three countries. A compelling and hopeful story unfolds from the results. The adoption of CA practices such as crop residue retention, minimum tillage, crop rotation, and intercropping is much higher than previously thought, highlighting a crucial need for better targeted surveys. Key enablers to strengthen adoption include access to CA extension, hosting demonstrations, and access to credit. In addition, age, and extension in the case of Zambia were identified as important drivers of the speed and persistence of adoption. Demand for mechanization is rising, which is key to address drudgery associated with CA and to raise production efficiencies. Key recommendations centered on the need for investments in a dense network of farmer-centric learning centers that allow for experiential learning, facilitating equitable access to mechanization, promoting private sector participation, and developing integrated weed management options as weeds remain the Achilles Heel of CA adoption in the region. [1]
Emerging lessons
A deep dive on the findings reveals critical considerations for the widespread adoption of Conservation Agriculture (CA). Firstly, weed-related labor challenges pose a significant obstacle, with around 75% of farmers in three countries citing weeds as the most constraining issue during initial CA adoption. Addressing this weed management challenge is essential, emphasizing the need for environmentally safe, non-chemical solutions as a research priority. Secondly, there is a noticeable gap between scientific research on CA and farmer practices, primarily attributed to limited technical knowledge. Bridging this gap requires innovative approaches to translate scientific information into practical, farmer-centered products. Thirdly, incentivizing CA adoption through complementary input support programs, like payments for environmental services, may encourage farmers, especially when private returns are not immediate.
Fourthly, strengthening extension systems is crucial to facilitate farmer learning and bridge the awareness-to-know-how gap. Lastly, investing in improved machinery value chains can alleviate high labor costs and drudgery associated with CA practices, with economic estimates suggesting farmers’ willingness to pay for machinery hire services. These insights collectively highlight the multifaceted nature of challenges and opportunities for scaling up CA adoption.
Moving forward
ACASA’s research findings are not just numbers — they are seeds of hope. They point towards a future where CA adoption among smallholder farmers can transform the breadbasket of the three African countries, and beyond. CIMMYT and its partners remain committed to continuous learning, refining their approaches, and working hand-in-hand with farmers to nurture the CA revolution.
It will not be a pipe dream to transform agriculture in Southern Africa through CA by cultivating seeds of resilience, one at a time. This is because the experience from the region suggests that with the right political will, it is possible to mainstream CA as a critical adjunct to climate-smart agriculture strategies and resilience building. This broader institutional and political buy-in is important since CA programming cannot succeed without sector-wide approaches to removing systemic constraints to technology adoption. A classic example is the Government-backed Pfumvudza program in Zimbabwe, which has seen adoption of planting basins conditioned on receipt of input subsidies soar to more than 90%.
[1] CIMMYT/IITA Scientists explore the weed issue in detail in a paper just accepted and forthcoming in Renewable Agriculture and Food Systems – Unanswered questions and unquestioned answers: The challenges of crop residue retention and weed control in Conservation Agriculture systems of southern Africa.
I am Grace Malaicha, a proud native of the Zidyana Extension Planning Areas in Central Malawi, where my journey with Conservation Agriculture (CA) began. In 2005, I observed neighboring farmers practicing CA techniques on their land. Intrigued and inspired, I decided to embark on this path myself, joining the CA program initiated by CIMMYT and Total LandCare in 2006. I started practicing it on my demonstration plot and observed that yields were getting higher from the second year onwards.
My dedication to CA has changed not only myself but also influenced other members of my farming community. As a mother trial host farmer under the CGIAR Initiative: Diversification for resilient agribusiness ecosystems in East and Southern Africa today, I have been implementing different treatments, which include maize doubled-up legume system and improved drought-tolerant maize varieties planted under CA on flat land and comparing it to the traditional ridge tillage system that involves substantial soil movement.
But what does CA mean to me? It is more than just a set of principles that I apply like minimum soil disturbance, mulching, and crop rotation. CA reduces drudgery, secures yields, and maintains productivity in times of climate change. CA has changed my approach to farming, transforming my once conventional maize monocrop into a diverse maize-legume system. By intercropping with two crops, I have spread the risk of unanticipated crop failure, while incorporating groundnut, cowpeas, and pigeon pea into the mix, which are more drought tolerant. I increased the land area under CA and tried it on many other crops including different legumes as rotation or intercrops, birds-eye chili, vegetables, and cassava.
Over the years, I have witnessed firsthand the harsh realities of a changing climate in central Malawi, from intense heat to prolonged droughts and erratic rainfall patterns. This year, 2024, has even been worse due to the prolonged dry spells between January and February, and the erratic rainfall during this time. Despite these challenges, our CA plots have continued to thrive, showcasing the resilience and adaptability of climate-smart farming practices.
Grace trains farmers on Conservation Agriculture. (Photo: Christian Thierfelder/CIMMYT)
Recognizing the power of knowledge sharing and from the encouragement by CIMMYT and Total LandCare, I started to train fellow farmers, both locally and across borders. At first, I worked with women groups around my homestead and trained about 100 female farmers on the principles of CA. I was fortunate to be given the opportunity to train other farmers in other districts of Malawi. Since 2008, I have also trained farmers in eastern Zambia and from Mozambique where all farmers speak my language Chichewa. Farmers believe other farmers more and are now realizing the benefits of implementing CA in their own fields.
I enrolled to be a local trainer in CA within my community in 2016. My passion for teaching and catalyzing change has led to the adoption of CA by numerous farmers. I embrace my commitment to ongoing learning through carefully implementing these CA trials and playing an active role during awareness meetings.
My life had changed so much. I was speaking on the radio and television. In 2012, the Minister of Agriculture visited my plot, and I was asked to speak in front of a Parliamentary Committee about my experiences as a smallholder woman farmer in Malawi. I spoke about what women can do in agriculture and what changes I made on my land. From representing my country at high level meetings, each step has shaped me into a resilient and empowered woman.
However, my journey has not been without obstacles, including hardships in my personal relationship. In 2012, I made the decision to join my husband in South Africa where I took up menial jobs to earn a living, abandoning my plot back home. But my true passion lay in farming, and I decided to make the bold decision to come back home, leaving my husband and continue with farming. Through perseverance and determination, I have overcome these challenges, and I am now much stronger.
Grace Malaicha stands in her field. (Photo: Christian Thierfelder/CIMMYT)
Today, I stand with pride in front of my CA plot, not only sustaining my family but also sending all my children to school. I now converted all my land to conservation agriculture, 3ha are under maize and 2ha under groundnuts. Beyond farming, I have investments in housing, claiming rentals in the nearby town of Salima to sustain my financial income and expand in farming.
I will continue on this path as I learned so much over the years and believe that CA may be the only climate-smart agriculture response in reach of smallholder farmers that everybody can apply, and I will continue to support others as a champion of CA.
Over the past few decades, Conservation Agriculture (CA) has moved from theory to practice for many farmers in southern Africa. CA is a system that involves minimum soil disturbance, crop residue retention, and crop diversification among other complimentary agricultural practices. One reason for its increasing popularity is its potential to mitigate threats from climate change while increasing yields.
However, there are limits to the adaptation of CA, especially for smallholder farmers. Challenges are both agronomic (e.g. lack of sufficient crop residues as mulch, weed control, pest and disease carryover through crop residues), socio-economic, and political (both locally and regionally).
For crop residue, the two most prevalent actions are using leftover crop residue for soil cover or feeding it to livestock. Currently, many farmers allow livestock to graze on crop residue in the field, leading to overgrazing and insufficient ground cover. This tradeoff is further challenged by other multiple household uses of residues such as fuel and building material. The most common way to control weeds is the application of herbicides. However, inefficient and injudicious herbicide use poses a threat to human health and the environment, so the research team set out to identify potential alternatives to chemical weed control as the sole practices in CA systems.
“The answer to the question ‘how should farmers control weeds?’ has always been herbicides,” said lead author Christian Thierfelder, CIMMYT principal cropping systems agronomist. “But herbicides have many negative side effects, so we wanted to question that answer and examine other potential weed control methods.”
What to do with crop residue
Previous research from the region found that ungrazed areas had long-term positive effects on soil fertility and crop yields. However, it is common practice for many farmers in Malawi, Zambia, and Zimbabwe to allow open grazing after the harvest in their communities. Livestock are free to graze wherever they wander, which results in overgrazing.
“Open grazing systems help keep costs down but are very inefficient in terms of use of resources. It leads to bare fields with poor soil,” said Thierfelder.
Maize on residues. (Photo: CIMMYT)
While it is easy to suggest that regulations should be enacted to limit open grazing, it is difficult to implement and enforce such rules in practice. The authors found that enforcement is lacking in smaller villages because community members are often related, which makes punishment difficult, and there is an inherent conflict of interest among those responsible for enforcement.
Controlling weeds
Weeding challenges in CA systems have been addressed worldwide by simply using herbicides. However, chemical weeding is often not affordable and, sometimes, inaccessible to the smallholder farmers and environmentally unfriendly.
Using herbicides, though effective when properly applied, also requires a degree of specialized knowledge, and without basic training, this may be an unviable option as they may pose a risk to the health of the farmers. Thus, alternatives need to be identified to overcome this challenge.
Some alternatives include mechanical methods, involving the use of handheld tools or more sophisticated tools pulled by animals or engines. While this can be effective, there is the possibility of high initial investments, and intercropping (a tenet of CA) forces farmers to maneuver carefully between rows to avoid unintended damage of the intercrop.
Increasing crop competition is another potential weed control system. By increasing plant density, reducing crop row spacing, and integrating other crops through intercropping, the crop competes more successfully with the weeds for resources such as light, moisture, and nutrients. When the crop seed rate is increased, the density of the crops increases, providing more cover to intercept light, and reducing the amount of light reaching the weeds thereby controlling their proliferation.
A holistic approach
“What we learned is that many of the crop residue and weed challenges are part of broader complications that cannot be resolved without understanding the interactions among the current scientific recommendations, private incentives, social norms, institutions, and government policy,” said Thierfelder.
Continuing research into CA should aim to examine the social and institutional innovations needed to mainstream CA as well as strengthen and expand the research on weed control alternatives and focus on the science of communal grazing land management to enhance their productivity.
Sub-Saharan Africa (SSA) has experienced the worst impacts of climate change on agriculture over the past decades and projections show such effects are going to intensify in the coming years. Diminished agricultural production has been the primary impact channel given the high reliance on rainfed agriculture in the region. Combined with a growing population, food security for millions of people is threatened.
Conservation Agriculture (CA) is a sustainable cropping system that can help reverse soil degradation, augment soil health, increase crop yields, and reduce labor requirements while helping smallholder farmers adapt to climate change. It is built on three core principles of minimum soil disturbance, crop residue retention, and crop diversification.
CA was introduced in southern Africa in the 1990s, but its adoption has been patchy and often associated with commercial farming. A group of researchers, led by Christian Thierfelder, principal cropping systems agronomist at CIMMYT, set out to understand the reasons why smallholder farmers adopt CA, or why they might not or indeed dis-adopt. Their results were published in Renewable Agriculture and Food Systems on March 12, 2024.
Conservation Agriculture plot. (Photo: CIMMYT)
“Conservation Agriculture can cushion farmers from the effects of climate change through its capacity to retain more soil water in response to high water infiltration and increased soil organic carbon. It is therefore a viable option to deal with increased heat and drought stress,” said Thierfelder. However, even with these benefits, adoption of CA has not been as widespread in countries like Malawi.
“There are regions within Malawi where CA has been promoted for a long time, also known as sentinel sites,” said Thierfelder. “In such places, adoption is rising, indicating that farmers are realizing the benefits of CA over time. Examining adoption dynamics in sentinel sites can provide valuable lessons on scaling CA and why some regions experience large rates of non- or dis-adoption.”
Thierfelder and his co-authors, Innocent Pangapanga-Phiri of the Center for Agricultural Research and Development (CARD) of the Lilongwe University of Agriculture and Natural Resources (LUANAR), and Hambulo Ngoma, scientist and agricultural economist at CIMMYT, examined the Nkhotakota district in central Malawi, one of the most promising examples of widespread CA adoption.
Total LandCare (TLC), a regional NGO working in Malawi has been consistently promoting CA in tandem with CIMMYT in the Nkhotakota district since 2005.
Results from both individual farmer interviews and focused group discussions revealed that farmers that implement CA saw higher yields per hectare than those who practiced conventional tillage practices. In addition, farmers using CA indicated greater resilience in times of drought, improved soil fertility, and reduced pest infestation.
Why adopt CA?
The primary factors enhancing CA adoption in the Nkhotakota district were the availability of training, extension and advisory services, and demonstration plots by the host farmers. Host farmers are farmers that have been trained by a TLC extension officer and have their own plot of land to demonstrate CA methods. In addition, host farmers train other farmers and share knowledge and skills through farmer field days and other local agricultural exhibitions.
“Social networks among the farmers serve a vital role in CA adoption,” said Ngoma. “Seeing tangible success carries significant weight for non-adopter farmers or temporal dis-adopters which can persuade them to adopt.”
Maize demonstration plot. (Photo: CIMMYT)
During focus group discussions facilitated by the authors, farmers indicated that demonstration plots also removed fear for the unknown and debunked some myths regarding CA systems, for example, that practitioners show ‘laziness’ if they do not conventionally till their land.
“This suggests that CA uptake could be enhanced with increased, targeted, and long-term promotion efforts that include demonstration plots,” said Ngoma.
Similarly, the longer duration of CA exposure positively influenced farmers’ decisions to adopt CA methods as longer exposure might allow farmers to better understand the benefits of CA practices.
Why not adopt CA?
Farmers reported socioeconomic, financial, and technical constraints to adopt CA. An example is that farmers might not have the labor and time available for weed control, a necessary step in the first few years after the transition to CA.
“Weed control is an important challenge during the early years of CA adoption and can be seen as the ‘Achilles heel’ of CA adoption,” said Thierfelder. CIMMYT scientists therefore focused a lot of research in recent years to find alternative weed control strategies based on integrated weed management (IWM) using chemical, biological, and mechanical control options.
Examining the stover in a maize plot. (Photo: CIMMYT)
In most cases, the benefits of CA adoption are seen only after 2 to 5 years. Having such a long-term view is not always possible for smallholder farmers, who often must make decisions based on current conditions and have immediate family obligations to meet.
As a contrast to adopters of CA, non-adopters reported a lack of knowledge about CA as a whole and a lack of specific technical knowledge needed to transition from more traditional methods to CA.
This scarcity of technical support is often due to the lack of strong agriculture extension support systems. Since CA adoption can be complex, capacity building of both farmers and extension agents can therefore foster adoption and implementation of CA. This reinforces that farmer-to-farmer approaches through host farmers could complement other sources of extension to foster adoption.
Next steps
The authors identified three policy recommendations to accelerate CA adoption. First, there is a need to continue promoting CA using farmer-centric approaches more consistently, e.g., the host farmer approach. Using a farmer-centered approach facilitates experiential learning and can serve as a motivation for peer-to-peer exchange and learning and can reduce misinformation. The host farmer approach can be augmented by mega-demonstrations to showcase CA implementation at scale. In addition, rapid and mass extension delivery can be enhanced by using digital technologies.
Second, CA promotion should allow farmers the time to experiment with different CA options before adoption. What remains unclear at the policy level is the types of incentives and support that can be given to farmers to encourage experimentation without creating economic dependence. NGOs and extension workers could help farmers deal with the weed pressure soon after converting from full to minimum tillage by providing herbicides and training.
Third, there is a need to build and strengthen farmer groups to facilitate easier access to training, to serve as conduits for incentive schemes such as payments for environmental services, and conditional input subsidies for CA farmers. Such market-smart incentives are key to induce initial adoption in the short term and to facilitate sustained adoption.
On the northern banks of the Ganges lies the city of Begusarai, in India’s Bihar State. Amid the expected structures of a city—temples and transit hubs—is a five-acre business hub dedicated to agriculture. This center, called the Bhusari Cold Storage Center, includes a 7,000-ton cold storage facility for vegetables, a dry grain storage area, outlets for farmer inputs and outputs, a farmer training center, a soil testing laboratory, and a farm implement bank. The brainchild of Navneet Ranjan, this facility works in collaboration with state partners, CIMMYT, and the Cereal System Initiative for South Asia (CSISA) project.
In the decade since its formation, the center has served nearly 100 villages in and around Begusarai, helping thousands of smallholder farmers access equipment, knowledge, and seeds they otherwise do not have access to.
“Since coming to the center I have not only benefited in using mechanized services at a small price but also learned about new schemes and incentives provided to smallholder farmers by the government,” said Ram Kumar Singh, a farmer from the village of Bikrampur. A similar story was related by Krishadev Rai from the village of Sakarpura, who said the laser land leveler machine at the center dramatically lowered costs associated with irrigation and other inputs, including information about different fertilizers and varietal seeds available at the market.
Farmers from the region have benefited immensely from the services of the center. According to Anurag Kumar, a CIMMYT senior research associate with CSISA, “The existence of the state-of-the-art center in the last decade has helped over 25,000 smallholder farmers avail themselves of services and information on farming and agriculture.” He said the center has also helped promote conservation agriculture technologies, implement climate-resilient farming practices, and build the capacity of smallholder farmers.
Ranjan, a native of the region, is a marine engineer by education but has diversified experiences from different sectors. A decade ago, Ranjan returned home after pursuing higher education and working in distant cities in India and abroad.
Ranjan met recently with CSISA representatives to share his motivation, hopes, and aspirations about the reach and impact of the Bhusari Center for farmers of Begusarai and beyond.
How did the Bhusari Agri-business center, popularly known as Bhusari Cold Storage, come into being?
In 2012, driven by a deep-rooted desire to bridge the significant societal gap between my professional advancements in the corporate world and the enduring struggles within my rural hometown in Bihar, I founded the Bhusari Agri-business Center. The name “Bhusari” was thoughtfully chosen, as it represents approximately 50 villages in the area, traditionally, and collectively known by this moniker, underscoring our commitment to the region’s agricultural heritage and community.
From the start, we knew we wanted our center, born from a combination of my family’s initial investment and funding secured through a State Bank of India loan alongside a significant subsidy from the Government of Bihar, to serve as a comprehensive agri-business solution. We designed this project not only as a business venture but as a social enterprise aimed at improving the livelihoods of local farmers by ensuring better returns for their produce, disrupting the traditional agricultural value chain that often left them exploited.
The establishment of Bhusari Cold Storage stands as a testament to the potential of marrying native understanding with professional management to foster socio-economic development in rural areas.
During an interactive session with progressive farmers, Ranjan listens to a farmer express his expectation from the Bhusari center. (Photo: CIMMYT)
What has been your biggest achievement with the establishment of Bhusari Cold Storage?
If I were to pinpoint our most significant achievement, it would be the creation of the farm implement bank. This initiative has helped revolutionize the agricultural landscape for the small-scale farmers in our area by providing them with access to modern farming equipment.
Before the inception of this bank, many farmers in our region faced challenges because of outdated farming techniques and the lack of access to modern machinery, which often resulted in inefficient farming practices and high operational costs. Introducing zero tillage, planters, harvesters, and especially the laser land leveler, has been a game-changer. This farm implement bank has also popularized the use of advanced agricultural technologies among the farming community. The positive effects of these modern farm implements have been many, including reduced labor costs, improved crop yields, and more sustainable farming practices.
How has a project like CSISA and other partners supported farmers and the efforts of agri-entrepreneurs like you in the region?
The support from CSISA and its partners has helped enhance the capabilities of farmers and bolster the efforts of agri-entrepreneurs in the region. CSISA’s contribution, particularly through its project scientists and field technicians, has been pivotal in training farmers. This collaboration has led to a significant increase in awareness and adoption of advanced agricultural implements and practices, including zero tillage and land levelers, among the farming community.
The center has conducted extensive training programs for many farmers, thanks to the resources, knowledge, and technology facilitated by CSISA, the State Department of Agriculture, and Krishi Vigyan Kendra (KVK). This partnership has enabled us to disseminate knowledge and tools to the farmers and drive the adoption of innovative farming techniques that lead to higher efficiency and reduced costs. The collaboration with CSISA and state partners has been a cornerstone in our mission to modernize agriculture in the region, making significant strides towards sustainable farming practices, and enhancing the livelihoods of the local farming community. Through these collective efforts, we have been able to empower farmers with the skills and technologies necessary to thrive in a competitive and evolving agricultural landscape.
Navneet Ranjan with Sarah Fernandes, CIMMYT global communications manager (2nd from left), during her visit to the Bhusari Cold Storage center with CSISA colleagues. (Photo: CIMMYT)
What do you hope for next for Bhusari or other endeavors in agri-business to support smallholder farmers?
Looking ahead, our vision for Bhusari and future agri-business endeavors deeply focuses on empowering smallholder farmers by enhancing their access to financial resources and tailored agricultural solutions. By addressing the financial barriers that often hinder farmers’ ability to invest in their operations, we aim to unlock new opportunities for growth and innovation in the agricultural sector. A key priority is to streamline the process so that these farmers can obtain credit lines and working capital more efficiently.
Additionally, recognizing farmers’ diverse needs and challenges in different regions, we are committed to making customized farm implements more readily available. These tailored tools are essential for increasing agricultural efficiency and productivity, as farming practices and conditions vary greatly across regions. To complement these efforts, we plan to expand our training programs and provide more customized knowledge to farmers.
Ultimately, the aim is to scale up this model and create several other replicable projects across Bihar and beyond. By demonstrating the success of these initiatives, we hope to inspire and facilitate similar transformations in other regions, fostering a more sustainable, efficient, and prosperous agricultural landscape for smallholder farmers.
Cover photo: Founder Navneet Ranjan (5th from right) and CIMMYT colleagues with beneficiary farmers at the Bhusari center in Begusarai, Bihar. (Photo: Nima Chodon/CIMMYT)
