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Location: Africa

CIMMYT’s work in Africa helps farmers access new maize and wheat systems-based technologies, information and markets, raising incomes and enhancing crop resilience to drought and climate change. CIMMYT sets priorities in consultation with ministries of agriculture, seed companies, farming communities and other stakeholders in the maize and wheat value chains. Our activities in Africa are wide ranging and include: breeding maize for drought tolerance and low-fertility soils, and for resistance to insect pests, foliar diseases and parasitic weeds; sustainably intensifying production in maize- and wheat-based systems; and investigating opportunities to reduce micronutrient and protein malnutrition among women and young children.

Can organic fertilizers rebuild Zimbabwe’s fragile soils?

Written by dmedina on . Posted in Blogs.

(Tracy Chokurongerwa and Atlas representative in her trial plot (Photo: CIMMYT)

“Our soils are exhausted. Even the best hybrid seed won’t yield much without nutrients. Organic fertilizers give us hope, but are they affordable and available? We need to understand our soils and make informed choices. This is an agrarian district; water isn’t scarce, but good soil is,” lamented Mrs. Munyoro, a district local authority official in Murehwa.

These words reflect a difficult reality confronting many smallholder farmers in Zimbabwe’s dryland farming regions: the urgent need to restore soil health in an increasingly fragile climate. With nearly 70% of the soils in districts like Murehwa and Mutoko classified as sandy, low in organic carbon, and prone to nutrient leaching, the potential for long-term productivity is steadily declining. Compounding this challenge is a decline in livestock populations due to disease, which reduces access to cattle manure, once a dependable source of organic nutrients.

To respond to these issues, the Resilience Building through Agroecological Intensification in Zimbabwe (RAIZ) project, led by the research consortium CIMMYT, is conducting field trials targeting soil fertility enhancement strategies that align scientific rigor with local practicality. These trials explore how conservation agriculture (CA) techniques and various organic fertility inputs—ranging from traditional manure to market-supplied products like Bokashi, Atlas orgfert (organic D), Orgfert, and Vermicompost—can sustainably improve soil fertility, structure, microbial health, and ultimately yield outcomes.

But why do these trials matter? The market is increasingly saturated with organic fertilisers, which offer both opportunities and dilemmas for smallholder farmers. From ZimEarthworms’ vermicompost, Bokashi, Orgfert, and Atlas orgfert (organic D) gaining visibility, questions remain around their affordability, accessibility, and context-specific performance. Farmers continue to rely on cattle manure where available, but rising livestock mortality, including from theileriosis (commonly referred to as January disease), is limiting this resource.

The RAIZ trials go beyond measuring yield data—they also evaluate farmer appreciation, labor requirements, and cost-effectiveness. Moreover, local authorities emphasize the importance of understanding how different organic inputs influence nutrient cycling, soil microbial activity, and overall soil fertility dynamics over time.

With several companies producing organic inputs, and cattle manure being a traditional staple, the big questions remain: What works best? What can farmers afford? And how can the findings shape broader adoption? This integrated approach is critical for guiding broader adoption of sustainable practices in Zimbabwe’s farming systems, where poor granite-derived sandy soils of low organic matter and low pH constitute up to 60% of the country’s arable land.

Insights from the Field

The farmer-led trial by Tracy Chokurongerwa in Murehwa offered compelling insights into the comparative value of organic inputs under both conventional and CA management, including intercropping setups such as maize–cowpea combinations. Treatments across plots were standardized to include five organic amendments: Vermicompost, Orgfert, Atlas orgfert (organic D), Bokashi, and cattle manure.

An aerial view of the experimental plot on organic soil amendments in Murehwa Ward 28 (Photo: CIMMYT)

Bokashi showed notable improved performance compared to the previous season, while Atlas orgfert (organic D) emerged as the preferred input by farmers based on visual crop vigor and yield observations. ZimEarthworms’ vermicompost performed particularly well when combined with Compound D fertilizer, suggesting synergistic effects between organic and synthetic inputs. However, challenges with land topography and water retention reinforced the need for supporting practices such as contour ridges, stormwater diversion channels, and timely land preparation.

In another trial, one farmer tested intercropping with pigeon pea and echoed the preference for Atlas orgfert (organic D). A separate rate trial examined the impact of increasing organic input volumes, revealing a positive yield response under CA systems, although erosion risks on sloped terrain were a concern—emphasizing once again the importance of land and water management.

In Mutoko, trials faced additional variables. Termite infestation was notable in one plot, aggravated by water runoff and poor mulch management. However, plots that utilized decomposed leaf litter mulch showed better moisture retention and stronger crop establishment under conservation agriculture practices. At some sites, the differences between CA and conventional till plots were striking to all visitors, clearly demonstrating the regenerative capacity of CA-based systems.

These examples illustrate how site-specific conditions—such as slope, soil type, and mulch availability—heavily influence the outcomes of soil fertility interventions. Importantly, researchers noted that marginal land allocation for trials (often the only land farmers can offer) can limit replicability and yield potential, highlighting the tension between field research conditions and real-world farming constraints.

Highlights of the 2023/24 Season

The 2023/24 season was a year of experimentation and learning for the RAIZ project, as farmers diligently undertook the targeted trials with recommended organic fertilizer rates and conservation agriculture (CA) methods. A total of 51 farmers participated in farmer-led experiments, with 30 testing standard or recommended rates of organic amendments under CA techniques, and 21 evaluating different organic fertilizer rates. Six decentralized learning centers hosted demonstrations on maize variety performance, CA principles, sorghum, and manure use, providing a platform for peer learning and knowledge exchange.

Despite erratic rainfall ranging from 250 to 500 mm, the trials delivered critical insights into what works and where. Results showed limited maize harvests, while the trials emphasized understanding which soil amendments are most effective across different areas. This approach helps farmers avoid costly fertilizer investments by identifying locally affordable and sustainable soil enhancement options. The need for early land preparation and strategic planning at the start of the season was a key takeaway, particularly in the face of climate unpredictability and ongoing soil degradation.

Reflections from the Ground

One of the strongest messages from both farmers and stakeholders was a call for continuity. Participants appreciated the way research was embedded within farmer realities and stressed the importance of scaling the initiative. Farmer engagement from the outset, coupled with co-implementation of trials, has fostered a sense of ownership and trust.

A particularly telling observation was the presence of witchweed in conventional maize plots, reinforcing the importance of integrated soil fertility management and diversified cropping systems. Such findings not only validate CA and organic input combinations but also contribute to a growing body of evidence on how to manage parasitic weeds through ecological approaches.

With community trust, scientific insight, and early success stories in hand, the pathway to broader adoption of organic-based soil restoration strategies is becoming clearer. However, sustained support, adaptive extension services, and inclusive learning platforms will be critical to maintain momentum. For districts like Murehwa and Mutoko, soil health is the limiting factor—but with the right inputs, the right knowledge, and continued collaboration, smallholder farmers can rebuild the fertility foundation of their lands, and with it, secure the future of rural livelihoods.

Jonathan Odhong

Written by dmedina on . Posted in Uncategorized.

Jonathan Odhong is a Kenyan national specializing in agricultural innovation outreach, scaling, and impact pathways within the SAS Africa Program. He has over 13 years of experience in agricultural research and development across 15 African countries, with a strong focus on facilitating stakeholder collaboration to scale validated technologies for inclusive agricultural transformation. Before joining CIMMYT, he worked with the International Institute of Tropical Agriculture (IITA) with postings in both Nigeria and Ghana. His research interests lie at the intersection of gender, equality, social inclusion, and agricultural innovation systems.

Kamaluddin Tijjani Aliyu

Written by dmedina on . Posted in Uncategorized.

Kamaluddin Tijjani is a cropping systems agronomist conducting research across a diverse range of tropical crops. His research interests include cropping systems, soil health and fertility management, plant nutrition, and digital extension advisories. He joined CIMMYT in 2023 to support various aspects of cropping systems and soil health research in the Southern Africa region.

Prior to joining CIMMYT, Kamaluddin worked at the Center for Dryland Agriculture in Nigeria and later at the International Institute of Tropical Agriculture, also in Nigeria. He holds a Bachelor of Science in General Agriculture, a Master of Science in Agronomy, and a Doctorate in Agronomy (specializing in crops and cropping systems in drylands), all from Bayero University, Kano, Nigeria.

Retraining Trialists: Enhancing Capacity for Quality Data Collection

Written by dmedina on . Posted in Blogs.

The Zambia Agriculture Research Institute (ZARI) recently conducted a comprehensive retraining program for trialists, led by Lloyd Mbulwe, Lead Breeder, with support from CIMMYT. The initiative was driven by a growing demand for enhanced capacity in field book management, DNA sampling, and quality control measures. 

A group photo of the training participants (Photo: ZARI)

The well-attended training brought together triallists and assistant breeders from across the country, representing various research programs, including sorghum, finger millet, and pearl millet. The platform offered a valuable opportunity to harmonize data collection procedures, ensuring consistency and accuracy in research efforts collected. 

The training covered the full spectra of trial management- from planting to harvest– alongside robust guidance on data collection. Participants also received instruction on data analysis and interpretation, enabling them to extract meaningful insights from their field data. A focused session on DNA leaf sample preparation for fingerprinting emphasized the importance of accuracy and integrity in genetic research. The training introduced key concepts in quality assurance and quality control (QAQC), essential for upholding rigorous scientific standards.  

Participants in the field during a hands-on evaluation session of sorghum varieties (Photo: ZARI)

A key highlight of the training was the practical session on field book management. Participants had the opportunity to work with the field book, identifying challenges and opportunities associated with its use in the field. This hands-on experience enabled them to develop a deeper understanding of the field book’s capabilities and limitations, ultimately sharpening their field-based data skills enhancing their field-based data skills.  

To complement the classroom and practical sessions, participants also visited the Plant Pathology Laboratory at ZARI Headquarters, where they gained insights into disease diagnosis, sample preparation, and QAQC procedures used in laboratory settings. The visit reinforced the importance of accurate field data and proper sample handling to support robust laboratory analysis and research outcomes. 

Participants at the Plant Pathology Laboratory at ZARI Headquarters, , exploring ongoing research activities (Photo: ZARI)

The training aimed to equip triallists with the necessary skills and knowledge to collect high-quality data, manage DNA samples effectively, and apply QAQC measures to ensure the reliability of research outcomes. 

By enhancing the capacity of trial lists, ZARI aims to improve the overall quality of research outputs-ultimately contributing to the development of improved crop varieties and enhanced agricultural productivity in Zambia. 

Building trust, bridging divides: How Zambia’s digital champions are paving the way for inclusive farming

Written by dmedina on . Posted in News.

Digital champions participating in a training activity in Choma (Photo: Moono Mwiinga Sekeleti)

In Zambia’s Southern Province, CIMMYT’s Atubandike[1] initiative is reshaping agricultural extension – moving beyond traditional top-down, one-size-fits-all models that have historically favored the well-resourced farmers. Instead, Atubandike promotes a more inclusive, demand-driven model that centers the voices of all farmers, regardless of gender, age, literacy level, or economic status. This shift is driven by a ‘phygital’ platform that blends the strengths of in-person support with the efficiency of mobile technology.

At the heart of Atubandike’s phygital platform are 84 local digital champions (DCs), half of whom are women, and 42% are under the age of 35. Selected by their communities, these champions embody the demographic shift that represents the future of agriculture. They are not external experts; but trusted peers and neighbors who serve as vital links between digital agricultural platforms and the people who need them most: the farmers. Their credibility, rooted in shared experience and local knowledge, is what enables them to build trust and drive meaningful change.

Ireen Chibilika practicing how to deliver a talk during the communications aspect of the trainings in Choma  (Photo: Moono Mwiinga Sekeleti)

While mobile technology holds immense potential to sustainably boost agricultural productivity[2], many farmers remain digitally excluded.  Barriers such as low literacy, limited phone access and entrenched social norms continue to hinder widespread engagement with digital advisory services [3]. That’s where the DCs step in – not only to introduce new tools, but to help dismantle these barriers; ensuring that no one is left behind.

A foundation of trust

In October and November 2024, Digital Champions from 14 Zambian communities gathered for a two-day, in-person workshop. This training, which complemented previous digital skills sessions, focused on co-developing two pivotal strategies: (1) building trust with farmers through effective communication and (2) addressing the complex gender, diversity, and inclusion (GDI) challenges affecting the DCs as well as the farmers they support.

Why begin with trust? Because trust is foundational to meaningful engagement. For farmers to adopt new climate-smart agriculture (CSA) practices and digital platforms like Atubandike, they must have confidence-both in the messengers and the technology itself. This insight shaped the training design, which was grounded [4] in empirical studies and further contextualized through in-depth interviews with 36 farmers in November 2023. The resulting curriculum emphasized care, communication, and competence – not only to help DCs build trust as messengers, but also to support farmers in using their phones with confidence. By strengthening both interpersonal and digital trust, DCs play a critical role in closing the gap between farmers and the tools that can transform their livelihoods.

The training was designed and delivered through a dialogical approach encouraging open conversation and engagement by the participants throughout the learning process. Through role plays, group discussions, and real-life scenario analysis, DCs engaged deeply with the material, facilitated peer-to-peer learning, and developed a strong sense of ownership and confidence in applying their new skills.

The session explored what it means to connect meaningfully with farmers and as one female participant shared, “the interactive nature of the training, with role plays and real-life scenarios, have given me the confidence and desire to go on and apply what I have learned in the field.”

Trust-building exercises, such as active listening and respectful communication, fostered empathy. These practices not only enhanced the DC’s ability to effectively engage with farmers – they reinforced the values that form the bedrock of inclusive community engagement.

Challenging norms and building inclusion

Trust, however, is only part of the story. True inclusion requires confronting the systemic biases that have long shaped rural agricultural systems. In Zambia, deeply rooted cultural norms often determine who gets to speak, who leads and whose voice is heard. Women, youth and the elderly frequently face significant barriers to leadership roles and are often excluded from participating in community dialogues. and their opinions often pushed aside.

Participants demonstrating how gender roles can be challenged using a drama skit (Photo: Moono Mwiinga Sekeleti)

To address this, the Gender, Diversity, and Inclusion (GDI) curriculum tackled exclusion head-on. Rooted in insights from 13 community engagement meetings held in mid-2024, the course content reflected the lived realities of local communities.  These were not abstract concepts-they were honest, community-led conversations about barriers people face and the solutions they envision.

One male Digital Champion reflected: “In our communities, farming tasks like milking, planting, and weeding are often tied to gender. But moving forward, we will encourage our fellow farmers to see these as shared responsibilities.”

Female DCs also shared their personal experiences of exclusion and resilience. “Being a woman, I have faced challenges in earning recognition as a leader,’ one participant shared. “But this training has given me confidence to lead in my community.”  Another young mother brought her newborn to the training – an act that symbolized the very inclusion the program espouses. “You didn’t just teach about inclusion,” she said expressing her gratitude to CIMMYT. “You demonstrated it, making sure I had support for my child so that I could focus and learn.”

An extension officer assisting a mother with her child during the training in Choma (Photo: Moono Mwiinga Sekeleti)

As the training came to a close, the DCs moved beyond theory. Together, they co-created practical strategies to address cultural resistance, promote inclusive participation, and support marginalized farmers in accessing essential agricultural resources.  Empowered by new skills and a strong sense of ownership, they left not only informed but ready to act.

From insight to impact

Some of the most meaningful learning moments came from lived experience. In one session, a DC recounted how a shift in approach – simply listening – changed her relationship with a skeptical farmer. “He told me that no one had really listened to him before. That act marked the moment we started working together.”

Breakthroughs emerged during the sessions on gender dynamics. Initially met with hesitation, the role-play exercises and open dialogue gradually opened space for reflection and growth. Male DCs began to recognize the value of women’s perspectives, while female participants found renewed confidence to speak up and voice their opinions. These seemingly small shifts in mindset marked important steps toward broader social change, grounded in empathy, understanding and mutual respect.

The training also brought logistical challenges, such as the high cost of reaching remote farmers, limited phone access, and the digital divine within some households. In response, the Atubandike program introduced practical solutions, including airtime and data allowances for DCs, encouraging people to share their phones or advising farmers to borrow handsets from trusted neighbors.

To sustain this momentum, CIMMYT launched regular one-on-one check-in calls with each DC. These touchpoints offer mentorship, reflection and tailored support as DCs continue to embed trust-building and inclusive practices into their everyday work.

Looking ahead: a story of empowerment

As the sessions concluded, a new energy and sense of purpose took hold.  DCs left not only with new skills, but with a clear commitment to act. They pledged to attend and host regular community meetings, conduct home visits for farmers unable to attend meetings and use WhatsApp groups to foster ongoing peer learning and collaboration.

This is just the beginning. The next chapter is about turning plans into practice ensuring that the digital revolution in agriculture is truly inclusive and leaves no farmer behind.

The story of digital champions in Zambia is one of empowerment. It is not only about their growth as leaders, but also about the transformation they are catalyzing in their communities. As they challenge social norms, build trust, and amplify unheard voices, they are shaping a more inclusive and resilient agricultural future.

 

[1]Atubandike, meaning “let’s chat” in Tonga, a local language spoken in Zambia’s Southern Province.

[2] Fabregas, Raissa, Michael Kremer, and Frank Schilbach. 2019. “Realizing the Potential of Digital Development: The Case of Agricultural Advice.” Science. American Association for the Advancement of Science. https://doi.org/10.1126/science.aay3038.

[3] Sterling, R. (2021, January 14). “Why Women Aren’t Using Your Ag App.” Agrilinks. https://agrilinks.org/post/why-women-arent-using-your-ag-app

[4] Examples include: Buck, Steven, and Jeffrey Alwang. 2011. “Agricultural Extension, Trust, and Learning: Results from Economic Experiments in Ecuador.” Agricultural Economics 42 (6): 685–99. https://doi.org/10.1111/j.1574-0862.2011.00547.x. Greene, Jessica, and Christal Ramos. 2021. “A Mixed Methods Examination of Health Care Provider Behaviors That Build Patients’ Trust.” Patient Education and Counseling 104 (5): 1222–28. https://doi.org/10.1016/j.pec.2020.09.003.

 

 

Fingerprinting bioinformatics pipeline cuts seed purity testing from days to clicks

Written by dmedina on . Posted in Blogs.

A new bioinformatics-driven tool dramatically accelerates seed purity testing, offering fast, automated parental purity checks and hybridity verification—thereby increasing the effectiveness of breeders, seed companies, and regulators.

Waiting days—or even weeks—to analyze Single Nucleotide Polymorphism (SNP) assay data to verify the genetic purity and hybridity of seeds and crosses may soon be a thing of the past. A new bioinformatics-driven seed purity testing pipeline significantly reduces the time required to confirm seed identity, bringing it down to just a few clicks.

The new pipeline uses DNA fingerprinting with SNPs in a fast, accurate, and scalable automated genetic analysis.

Modernizing Genetic Purity and Hybridity Testing

Traditionally, seed producers and certification agencies have relied on grow-out tests and morphological analysis to assess genetic purity. These methods are labor-intensive and time-consuming, often requiring weeks or months of field or greenhouse work by trained technicians.

Although CIMMYT has long used molecular markers to verify parental purity and hybridity, challenges remained—particularly the lack of automated tools and integrated platforms to make the process seamless and accessible.

That is changing, thanks to software developed by Abhishek Rathore and team. The pipeline automatically compares each sample’s genetic profile to its expected reference using a custom algorithm. Based on user-defined thresholds, the tool confirms parental purity, identifies putative F1 hybrids, and flags failed crosses.

“We wanted a tool that breeders and seed companies can use without needing specialized bioinformatics skills,” said Abhishek Rathore, bioinformatics specialist at CIMMYT. “Once the DNA data is generated, the analysis is push-button. The software quickly interprets the SNP results and produces an easy-to-read report on seed purity. It’s about making advanced bioinformatics accessible and routine for parental purity and F1 verifications.”

Speedy, Automated, and User-Friendly

Early implementation of the pipeline has demonstrated large gains in speed and efficiency. What previously required extensive manual effort can now be completed in minutes.

The system is designed with user-friendliness in mind: lab technicians simply upload SNP assay results into an intuitive interface, and the pipeline returns clear metrics—such as “% purity”—while flagging any off-type individuals. With the computational workload fully automated, even seed companies and labs with minimal informatics infrastructure can benefit.

“Automation is key,” added Rathore. “By reducing manual steps and subjective interpretation, we save time and minimize human error. You can process dozens of seed samples overnight and receive a comprehensive genetic report by morning.”

To make this automation accessible to stakeholders across NARS, CIMMYT’s biometrician Roma Das developed a user-friendly web interface, while Peter Kimathi, a bioinformatics and software developer, developed a custom report and deployed the pipeline as a web service on CIMMYT’s servers (link below).

Widespread Adoption Across Africa

Since its rollout, the pipeline has been widely adopted by CIMMYT and partners through the Africa Dryland Crops Improvement Network (ADCIN). Mohan Chejerla, Genomics Expert at CIMMYT, has already applied the pipeline to over 23,000 samples, ensuring quality assurance and quality control (QA/QC) for breeding pipelines across Kenya, Uganda, Mali, Senegal, Burkina Faso, Ethiopia, Tanzania, Niger, Togo, Zambia, and Ghana.

This broad uptake underscores the demand for reliable, scalable seed purity testing—and the pipeline’s value for enhancing crop breeding and seed system integrity.

Additional Information:
🔗 Pipeline Source Code
🔗 CIMMYT Pipeline Implementation

Decades of on-station conservation agriculture trials reveal key farming insights for Zambia’s changing climate

Written by mcallejas on . Posted in Blogs.

Aerial view of one of the long-term, on-station trials on conservation agriculture, CIMMYT (Photo: CIMMYT).

Long-term research rarely offers quick fixes. More often, it is a patient pursuit, marked by seasons of uncertainty, occasional setbacks, and gradual, hard-won insights. Yet, when carefully managed, its outcomes can redefine farming systems and adaptation strategies to long-term climate trends.  

This is the story of CIMMYT‘s persistence, working alongside Zambia’s Ministry of Agriculture to maintain some of Southern Africa’s most critical long-term Conservation Agriculture (CA) experiments for over two decades. 

Scattered across Zambia’s contrasting agro-ecological zones, from the high rainfall Northern province to the drought-prone Southern Province, and the tropical savanna climate in the Eastern province, the Misamfu Research Station, Monze Farmer Training Centre, and Msekera Research Station have hosted these long-term trials, with Monze being established in 2005, Msekera in 2011, and Misamfu in 2016. Through searing droughts, erratic rainfall, floods, pest outbreaks and changing policy landscapes, these stations have systematically tested CA principles over multiple seasons, focusing on crop productivity, economic viability, and soil health, pest and disease dynamics, soil moisture and climate resilience among other aspects, to adapt CA to local farming conditions. More importantly, they have adapted these principles to Zambia’s diverse socio-economic realities and contexts. 

 

Testing CA under Zambia’s climate gradients

At the core of these trials is a simple, but essential question: “Can CA systems be adapted to Zambia’s smallholder farmer conditions to improve productivity, soil health, and resilience under climate variability?” 

Each research station offers a unique window into answering this question. For instance, Monze Farmer Training Centre located in Zambia’s Southern Province, hosts one of the oldest CA trials in the region. In addition, originally set up with eight main treatments and 32 trial plots, it has since expanded to 48 plots consisting of 12 treatments, testing CA under no-tillage against conventional plough-based systems with maize, cotton and sun hemp rotations of varying sequences. The plots have accumulated invaluable data, owing to the detailed and precise monitoring of yields, soil moisture, infiltration rates, pest and disease dynamics, soil quality indicators, and soil organic matter, year after year. 

Christian Thierfelder, CIMMYT’s Principal Cropping Systems Agronomist and founder of all long-term experiments reflects, “When we started, CA was a hot topic in Zambia. We wanted to know its benefits if you persist with these systems under Zambia’s conditions, not just for three or five years, but over decades”. 

Two decades later, key findings from these trials reveal that rotations that include cotton and/or sun hemp consistently outperform others in maize yields due to the nitrogen-fixing and soil-improving effects of the legume and deep-rooting cotton. CA plots, especially those combining minimum tillage, residue retention, and rotations, also demonstrate better soil moisture retention and infiltration, even in drought years. In fact, one striking observation has been that during intense rainfall events, water infiltration under CA plots is dramatically higher than under conventional systems, reducing flooding, erosion, and surface run-off. CA plots absorb and retain more moisture, a significant advantage as rainfall patterns become more erratic. 

However, the trials have also revealed complex trade-offs that researchers alike must accommodate. For example, while the maize-cotton-sun hemp rotation delivers exceptional yields, its economic viability hinges on market dynamics. When sun hemp seed and cotton commanded reasonable prices in the past, the system was highly profitable; in its absence, farmers risk sacrificing income for soil benefits alone. Another surprising insight comes from long-term soil organic carbon (SOC) trends. While CA systems reduce erosion and improve infiltration, the anticipated build-up of SOC has remained elusive, except at one long-term trial site outside Zambia at the Chitedze Research Station in Malawi. Thierfelder notes, “Declining rainfall, declining biomass, and declining soil carbon levels are interconnected. CA alone may not reverse these trends unless combined with complementary practices like manure application or agroforestry species.” 

A snapshot of different trials being implemented at Monze FTC and Misamfu Research station, CIMMYT (Photo: CIMMYT).

Adapting CA for high-rainfall areas

Misamfu Research Station, in Zambia’s wetter Northern Province, has wrestled with another challenge: CA’s performance under high-rainfall conditions. Since 2016, Misamfu has hosted the long-term CA systems trial. Originally designed to conserve moisture, CA systems, especially when planted on the flat, struggle with too much moisture, leading to waterlogging, and here, not drought, is the problem. CA plots without drainage interventions have underperformed in very wet years. Yet, new innovations are emerging. Permanent raised-beds and permanent ridges, two promising CA systems developed under irrigated systems, are showing promise by improving drainage while retaining CA’s soil health benefits. 

 “In relatively dry years, CA systems shine,” explains Thierfelder, “but under waterlogged conditions, we now know that permanent raised beds or ridges could be the missing link.” “Over the long-term, CA systems planted on the flat are capable of buffering high rainfall effects, probably due to improved infiltration”, remarked Blessing Mhlanga, CIMMYT’s Cropping Systems Agronomist.  

Capturing cumulative effects over time

Since 2011, the CA long-term experiment at Msekera Research Station in Eastern Zambia has revealed how CA performs beyond short-term seasonal gains. Unlike seasonal experiments, these trials capture the gradual, cumulative effects of CA on soil health, water use, weed and pest dynamics, and crop yields under real-world conditions. With ten treatments, including conventional tillage, ridge and furrow systems, and CA practices- such as direct seeding, residue retention, and crop rotations, the trials provide critical evidence. So far, results from Msekera show that no-tillage systems with crop residue retention, especially when combined with crop rotations, significantly improve soil moisture retention and structure, leading to more stable crop production over time. 

Why long-term matters

Long-term trials are essential to fully understand the benefits and limitations of CA across a full spectrum of climate conditions. Such trials require consistent donor support, strong partnerships with research station managers, and effective field management. Unlike short-term experiments, long-term trials capture the cumulative effects of CA practices across diverse seasons, including droughts and floods.  

These trials also show that CA is not a one-size-fits-all solution — its success hinges on continuous application over time. Since to date, rainfall patterns cannot be predicted precisely, deciding to adopt CA only in dry years is ineffective. Instead, long-term trials reveal how CA builds resilience and improves productivity year after year. 

This body of work is more than just a collection of experiments. It is a living archive, many years of climate, crop, and soil interactions, yielding insights impossible to capture through short-term trials. “We learned, for example, that infiltration rates under CA improved noticeably within just two years,” says Thierfelder. “But understanding yield trends, soil fertility dynamics or the role of rotations takes decades.” Moreover, these trials have shown that CA is not a one-size-fits-all solution. Its benefits are context-specific, often requiring adaptive management depending on rainfall, soil type, and market conditions. 

From plots to farmers’ fields

The value of this long-term work extends beyond research stations. Field days and exposure visits have allowed farmers and extension officers to engage directly with these trials, drawing lessons for their own fields. In some regions, farmers are already adapting lessons, adopting rotations, maintaining residues, experimenting with raised beds and permanent ridges, and tailoring CA to their realities. Importantly, the trials continue to evolve. While core treatments remain unchanged to preserve data integrity, small innovations, such as integrating manure or testing alternative rotations, are helping to sharpen recommendations for the next generation of CA practitioners. 

An aerial view of a mother trial implementer in Zambia, SIFAZ (Photo: CIMMYT).

The road ahead

As climate variability intensifies, the value of long-term research becomes even more critical. These trials offer answers to one of agriculture’s most urgent questions: How can CA be fine-tuned to deliver resilience and productivity? This is not just a scientific quest; it is about securing the future of Zambia’s smallholders, helping them navigate a more uncertain climate future, and ensuring their fields remain productive for the next generations. 

Small grains and new methods bring resilience to Zimbabwean farmers

Written by mcallejas on . Posted in In the media.

In Zimbabwe, farmers are turning to conservation agriculture and climate-resilient crops such as millet, sorghum and cowpeas in order to combat the growing threat of drought, which has been exacerbated by El Niño. Traditional farming methods have left soils degraded and yields diminished, prompting many farmers, such as Memory Mukototse from Kaidza village, to adopt new techniques through programmes like the R4 Rural Resilience Initiative, which is led by the World Food Programme.

By comparing conservation and conventional farming methods, farmers have discovered that practices such as minimal soil disturbance, crop rotation and maintaining ground cover can greatly enhance harvests and improve water retention. Backed by CIMMYT, this farmer-driven research and peer-to-peer knowledge exchange, facilitated through seed fairs, group coordination and exchange visits, has not only enhanced food security, but also empowered communities to adapt and flourish in the face of challenging climatic conditions.

Read the full story.

When the worm won’t wait: Battling Fall Armyworm with science, seeds and farmer-led solutions

Written by mcallejas on . Posted in Blogs.

The destructive Fall armyworm in a farmer’s field (CIMMYT)

Farmers in southern Africa face a double tragedy: drought in one season or flooded fields in another. Shredded leaves, twisted tassels, and frizzled maize cobs reflect more than just a failed harvest; they signal a deepening threat to food security and livelihoods. Compounding this hardship is the growing threat of pests and diseases, many of which are fuelled by climate change. Chief among them is the fall armyworm (FAW) (Spodoptera frugiperda), an invasive pest that arrived in Africa nearly a decade ago and continues to undermine smallholder farmers’ resilience, devouring crops stalk by stalk. 

Maize is central to food security in Zambia and Malawi, where it occupies up to 80% of cultivated land and accounts for over half of the daily calorie intake. In Zambia alone, more than 90% of smallholder households grow maize, underscoring its economic and political weight. Yet, in recent years, farmers have had to contend with losses not just from erratic rainfall and poor soils, but from pests and diseases that seem to multiply with each season. 

A recent CIMMYT-led study across 1,100 farming households in Malawi and Zambia, as part of the Southern African Accelerated Innovation Delivery Initiative (AID-I) Rapid Delivery Hub, highlights the long-recognized challenge of FAW damage. The study confirms that FAW is not only persistent but also costly. During 2023/2024 season, 70% of surveyed farmers reported FAW damage to their maize fields. On average, FAW infestations resulted in a 13.5% to 30% reduction in maize yields, translating to more than 230 kg of lost grain per hectare. Other crops were also heavily affected, with the rosette virus reducing groundnut yields by 27% and soybean rust causing up to 25% losses in soybean fields. 

The effects of FAW extend beyond crop harvests. It has also been shown to significantly undermine household income and food security. Although the 2023/2024 losses are slightly lower than earlier estimates, which ranged from 22% to 67% across Africa, they are still substantial enough to affect food security and livelihoods. Furthermore, the combined effects of FAW, rosette disease and rust had large income and food security impacts.  Households facing the triple burden of these pests and diseases – FAW, groundnut rosette virus and soybean rust on their three most important crops are twice as likely to experience food insecurity as compared to experiencing just one of these threats.  

In response, many farmers are turning to pesticides, improved seeds and crop rotation. However, as the data indicates, pesticides alone are far from being a comprehensive solution. They are often costly, frequently misapplied, and carry significant risks to both human and the environment. Moreover, FAW is increasingly developing resistance to commonly used pesticide formulations. Access to agricultural extension services remains limited: only 27% of surveyed farmers in Zambia and 54% in Malawi reportedly receiving such support. Without proper guidance on when and how to apply pesticides, their misuse can end up doing more harm than good. 

These findings highlight a broader challenge: the urgent need for sustainable, science- and data-driven solutions that are practical for farmers. At the core of the response is a new generation of maize hybrids with tolerance to FAW. CIMMYT in collaboration with its partners using conventional breeding has developed new generation of hybrids with native genetic (non-transgenic) tolerance to FAW. The breeding process is complex, requiring years of field testing across diverse agroecological zones to ensure adaptability and performance. 

In 2023, three FAW tolerant maize varieties developed by CIMMYT were officially released by the Zambia Agriculture Research Institute (ZARI) and sub-licensed to seed companies for commercialization. With support from AID-I and the CGIAR Sustainable Farming program, CIMMYT and partners are actively promoting these hybrids among smallholder farmers. The AID-I project has provided critical support to accelerate seed production of these hybrids. Zamseed and AfriSeed are leading efforts to bring these varieties to market. 

Mebby Chipimo Munyemba, a proud farmer showcasing her FAW-tolerant maize field in Mazabuka, Zambia (CIMMYT)

Through the Sustainable Farming program, on-farm trials have been established across three agroecological gradients in Siavonga, Mazabuka, and Mbala districts to test the performance under farmer conditions and understand their impact on farmer outcomes. There are two treatments, which include growing the FAW-tolerant maize variety alone, and intercropping it with other legumes. Rather than assuming a one-size-fits-all solution, CIMMYT is using randomized control trials (RCTs) to assess the real-world performance of these varieties under varying conditions. The goal is not only to validate the science but to build a stronger case for scaling. 

In Siavonga, where high temperatures and erratic rainfall create ideal conditions for FAW outbreaks, early results show promising benefits from using FAW-tolerant maize varieties. Preliminary foliar damage assessment indicates significantly reduced infestation levels compared to susceptible varieties. In contrast, the benefits in Mazabuka are less pronounced, while in Mbala – a cooler, higher-altitude location with lower pest pressure- no major gains have yet been observed. These location-specific findings are critical for informing hyperlocal, evidence-based policymaking.  Equally important is building awareness and trust among farmers, ensuring they know these improved varieties exist and understand how to grow them applying good agronomic practices. Through AID-I, CIMMYT is working to close that gap, demonstrating the business case for investing in FAW tolerant maize seed to the private sector, and equipping farmers with knowledge that goes beyond what is in the bag.  

For example, a survey carried out in Malawi, Tanzania and Zambia revealed that awareness of FAW-tolerant maize varieties remains low, with only 19% of farmers in Malawi, 34% in Tanzania and 39% in Zambia had heard of FAW-tolerant maize varieties. This underscores the urgent need to scale up awareness campaigns and initiatives to stimulate demand. Encouragingly, among the farmers who are aware of these varieties, the majority expressed a willingness to purchase them at prices comparable to those of other hybrid maize varieties. This indicates a strong business case for private sector investment in seed multiplication and distribution to meet potential demand and expand access to FAW-tolerant maize hybrids. 

For many farmers in Southern Africa, the FAW remains a persistent threat. However, through science, strong partnerships, and a commitment to field-based evidence, the tide is turning, one trial, one variety, one growing season at a time. 

IMIC-Africa Field Day 2025: Where science meets collaboration to accelerate maize innovation in Africa

Written by dmedina on . Posted in News.

Regional partners in front of the CIMMYT maize lines displayed during field day. (CIMMYT)

Every year, public and private sector partners participate at The International Maize Improvement Consortium for Africa (IMIC-Africa) Field Day for Southern Africa, a unique event that seeks to transform the maize sector. The 2025 field day, hosted at the University of Zimbabwe farm on April 9th, brought together an eclectic blend of partners from seven African countries, including long-standing collaborators and new entrants such as AMAC Seeds and Grow Trade Seeds. Moving beyond just showcasing key achievements and new germplasm to partners, the field day fostered critical and meaningful discussions and experience sharing among partners, from lab to farm.

By offering access to both early- and advanced-generation maize lines, the event was a critical intersection point where public and private players align to tackle the continent’s most pressing agricultural challenges. In addition, members have the opportunity to test their pre-commercial hybrids through CIMMYT-led multi-location trials, ensuring that the products are carefully evaluated across diverse agroecologies and for essential traits such as drought tolerance, pest resistance and high yield potential. It also provides an avenue for suggesting improvements to the demonstrations, ranging from labelling.

We took time to get a clear perspective from CIMMYT scientists, private and public sector representatives.

Q: How important is the IMIC-Africa Field day in addressing maize sector challenges?

“Success of breeding programs is hinged on injection of new genetics that drive gains. Developing high value inbred and donor lines is an expensive process and platforms such as IMIC Africa help reduce product development costs in maize breeding programs of the partners and reduce time taken to deliver solutions to farmers,” emphasized Aparna Das, Senior Technical Program Manager for the Global Maize Program.

“It is rare to get an opportunity to observe and select hundreds of lines in one location as it offers each participant an opportunity to see the performance potential of each line at a glance” said James Gethi, southern Africa Seed Systems Specialist and IMIC Africa southern Africa coordinator.

Mainassara Zaman-Allah, CIMMYT’s Country Representative for Zimbabwe, reflected on the core strengths of the consortium, “It has been 8 years since the launch of the initiative, and one of the core strengths of IMIC-Africa is its inclusivity. Whether from a national agricultural research institution, maize seed company or international agricultural research organizations, IMIC-Africa opens its doors for all involved in maize breeding for the African market. This diversity enables us to leverage a broad range of expertise and resources, to articulate the challenges faced by African farmers.”

Q: What impact have the maize lines had on breeding programs?

“We have seen major improvements in the vigor of materials displayed that open a new frontier for single cross hybrid varieties development” commented Oswell Ndoro from AMAC seeds, a new member of IMIC Africa, signalling optimism for the future.

Walter Trevisan, consultant for Helix Seeds, praised CIMMYT’s Zimbabwe scientists for their collaborative support in selections, “Thank you very much for this outstanding work! We sure appreciate the help of the CIMMYT Zimbabwe scientists in helping us with this task.”

Davison Chaingeni from ARISS, formerly DR&SS Zimbabwe, echoed this, “We continue to see value in getting more DH-based lines. We hope the vigor translates to yield.”

 

 

 

 

 

 

 

 

 

Q: Take us through on what was on offer in the field, where science meets need and demand.

“An array of 624 CIMMYT maize lines were on display, which consisted of 614 new lines from 4 different product profiles providing insights into the performance of different materials. The materials span early-, intermediate, and late- maturity groups to nutritious maize breeding pipelines. A critical component of the field display was trait donor lines where 5 lines were on display for selection. The traits donor lines on display were for drought, drought & heat and Low N & MLN tolerance. This comprehensive showcase enabled seed companies and NARS partners to make informed selections, tailored to their breeding needs,” Gethi explained.

Development of provitamin A-enriched maize (PVA) addresses one of the emerging challenges in combating hidden hunger and animal feed. He further adds, “On display were 126 lines originating from the PVA-enriched maize breeding pipeline. The efforts underscore CIMMYT’s commitment to address regional nutritional needs through targeted breeding initiatives.”

 

IMIC-Africa lines on display showing differences in phenotype for exploitation by partners (CIMMYT)

Q: What improvements would partners like to see moving forward?

Amsal Tarekegne, head of breeding at Zamseed Seed Company, pointed to a practical bottleneck, “It is a challenge understanding the pedigree information provided in the field book due to its length.”

 

 

 

 

 

 

 

 

 

 

Yet, the road ahead still demands refinement.  Lubasi Sinyinda from Zambia Agricultural Research Institute (ZARI), one of the NARS partners in IMIC-Africa since its inception, noted, “I would like to see more fall armyworm (FAW) and heat-tolerant lines displayed.”

For new entrants like Petros Guveya of Grow Trade Seed company, navigating CIMMYT’s updated heterotic groupings was a challenge, underlining the need for improved orientation for first-time participants.

On the brighter side, Themba Mutuvira complimented the design of the fields by indicating they were easy to navigate through. “The fields were well labelled, and we had no challenges at all identifying the materials”

A living laboratory for Africa’s Maize future

The 2025 IMIC-Africa Field Day was not just an event, but a living laboratory of innovation, critique, and partnership. In the face of mounting climate pressures, pest threats, and nutritional gaps, such platforms offer a rare and invaluable opportunity for the maize breeding community to align, adapt, and accelerate. As IMIC-Africa evolves, the call from partners is clear: deepen inclusivity, enhance clarity, and continually refine the experience to ensure that each plot, each line translates into impact on the farm and food on the table. The future of Africa’s maize sector will be built not in silos, but in such collaborative spaces where science meets the lived realities of farmers and seed companies alike.

How Crops to End Hunger is transforming CGIAR crop breeding from the ground up

Written by dmedina on . Posted in Blogs.

When crop breeding succeeds, the impact is dramatic: improved varieties reach farmers, productivity increases, and resilience to climate change and disease improves. But breeding success doesn’t happen by chance. It relies on modern facilities, cutting-edge tools, and the ability to test and select for complex, evolving traits. That’s where Crops to End Hunger (CtEH) comes in. At CGIAR Science Week, the project team and beneficiaries demonstrated how.  

A project designed for exponential impact 

Launched in 2019, CtEH aimed to support the modernization of CGIAR’s crop breeding infrastructure, with support from GIZ, the Gates Foundation, the US government, DFID, and ACIAR. As it nears the end of the most recent two-year GIZ funding cycle, the project has made targeted investments in upgrading breeding station infrastructure, equipping them with advanced tools, building capacity across CGIAR and national breeding teams, and developing the foundational systems needed to accelerate the entire breeding process. 

Supporting CGIAR Centers’ core functions 

At CGIAR Science Week, Bram Govaerts, CIMMYT Director General, explained: “CtEH is crucial for implementing CIMMYT 2030 strategy. Support has increased our breeding capacity for maize, wheat, and newly added dryland crops that complement maize and wheat cropping systems.” 

One example is the Groundnut Biotic Stress Screening Network, established with CtEH support. The network has strengthened the capacity of partners in Uganda and Malawi to screen for groundnut rosette disease; a devastating disease spread by aphids can result in 100% crop loss, with annual losses of over $150 million. The screening network will enable development of resistant varieties. 

In Kenya, a $2.5 million worth infrastructure upgrade at the KALRO–CIMMYT Crop Research Facility in Kiboko, has accelerated breeding cycles. This investment is enabling the development of new varieties tailored to the needs of East African farmers. Drought-tolerant maize varieties developed through work in Kenya and Zimbabwe have expanded dramatically, from just 0.5 million hectares in 2010 to 8.5 million hectares across sub-Saharan Africa today. 

The Kiboko station is also a regional leader in pest and disease resistance. Its advanced screening capabilities for fall armyworm have led to the release of three tolerant maize hybrids, benefiting farmers in Kenya, Malawi, Zambia, Zimbabwe, South Sudan, and Ghana. The development of maize varieties resistant to maize lethal necrosis further demonstrates the station’s critical role in enhancing food security across the region. 

Operational improvements: more than bricks and mortar 

CtEH isn’t just about infrastructure; it’s also about operational transformation which profoundly change the breeding work. For instance, as Gustavo Teixeira explains, “The installation of reliable irrigation systems, one of CtEH’s key priorities, improves breeding efficiency in several ways. It enables off-season trials, allowing breeders to conduct multiple generations per year. It promotes plot control, ensuring uniformity across trial plots and data quality. Finally, it improves the ability to breed for drought tolerance.” 

In Ghana, Maxwell Asante of CSIR-CRI described how CtEH brought crop-neutral upgrades that have encouraged teams to strategically plan and align resources, enabled cost attribution to specific breeding programs, improving accountability, and fostered cross-location collaboration by making centralized services possible.  

These operational improvements are helping CGIAR and national systems move toward truly modern breeding programs that can operate with greater precision, speed, and coordination. 

Building for regional collaboration and innovation 

Bram Govaerts also emphasized that collaboration is central to the future of breeding, and that CtEH is helping to make that possible. 

“Strategic collaborations enhance our impact by leveraging diverse resources and expertise, especially through public-private partnerships that scale research and technology transfer for agricultural transformation.” 

Facilities and systems funded by CtEH are helping CGIAR foster cross-disciplinary innovation and strengthen ties with governments, donors, and technology companies. This makes it easier to bridge the gap between research and real-world application – exactly what’s needed to accelerate impact. 

Empowering women in breeding 

Infrastructure improvements under CtEH have considered inclusivity and gender equity. 

Aparna Das, CIMMYT Technical Lead, explained that modernized stations have been upgraded to better support women in breeding roles – such as providing restrooms and expression rooms in remote research stations, often located far from urban centers, which help attract talent. 

Why does this matter? Women breeders bring valuable perspectives, particularly in identifying gender-relevant traits, like cooking time, seed size, and ease of harvesting. Diverse, balanced breeding teams also tend to be more dynamic and innovative, leading to better science and more relevant products for farmers. 

Targeting the right traits 

Breeding for traits farmers need starts with the ability to test and measure those traits under real-world conditions. This can require specialized equipment. 

Maxwell Asante emphasized that this is where CtEH makes a difference: 

“Testing for traits is fundamental. And now, we’re not just selecting for yield – we’re breeding for disease resistance, climate resilience, cooking quality, and more. The only way to do this efficiently is through modern breeding infrastructure and processes.” 

Modern breeding enables scientists to combine multiple traits in a single variety and identify the best candidates with greater accuracy and confidence. This is made possible through CtEH investments in equipment and data analytics, such as Bioflow, the CtEH-funded breeding analytics pipeline developed for CGIAR and its partners. 

Long-term impact through smart design 

What makes CtEH unique is its sustainability-by-design approach. The project was structured to build long-lasting capacity and to leverage investments from across CGIAR Initiatives, amplifying both the quality of upgrades and their outcomes. 

Whether it’s enabling year-round trials, supporting new partnerships, or empowering a more diverse generation of breeders, CtEH is not just upgrading infrastructure, it’s also reshaping CGIAR and partners’ breeding. 

As CGIAR continues to respond to climate, nutrition, and food security challenges, projects like CtEH are making sure we have the tools, systems, and people in place to breed for tomorrow – starting today. 

To learn more about Crops to End Hunger, check out other stories here.