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.”
CIMMYT contributes to Mars’ sustainability efforts by equipping Mexican maize producers with tools and training through the Next Generation Soil program. This collaboration supports Mars’ climate-smart agriculture initiatives, reducing agricultural greenhouse gas emissions, which make up 60% of its total GHG footprint. By promoting regenerative agriculture practices, CIMMYT helps Mars work towards a 50% GHG reduction by 2030 and achieving net-zero emissions by 2050.
A practical demonstration at Jabalpur. (Photo: CIMMYT)
Agriculture feeds the world. Yet traditional cycles of ploughing, planting, and harvesting crop and biomass products is inefficient of labor and other scarce resources and depletes soil health while emitting greenhouse gases that contribute to climate change.
One effort to ameliorate the negative effects of farming is a set of practices referred to as conservation agriculture (CA), based on the principles of minimal mechanical soil disturbance, permanent soil cover with plant material, and crop diversification.
To deliver advanced, high-level instruction on current innovative science around important aspects of cropping and farming system management to scientists from India, Bangladesh, Egypt, and Morocco, the 12th Advanced Conservation Agriculture Course hosted by the Indian Council of Agricultural Research (ICAR), CIMMYT, and the Borlaug Institute for South Asia (BISA) took place in India from December 10 to 24, 2023.
SK Chaudhari, deputy director general for Natural Resource Management, ICAR; HS Jat, director of the Indian Council of Agricultural Research-Indian Institute of Maize Research (ICAR-IIMR); Arun Joshi, country representative for India and BISA managing director, CIMMYT-India; Mahesh K. Gathala, senior systems agronomist and science lead, CIMMYT-Bangladesh; and Alison Laing, agroecologist, CIMMYT-Bangladesh, all attended the opening ceremony at the National Agricultural Science Complex in New Delhi, India.
This CA course integrated scientific advancements and multidisciplinary techniques to sustainably develop agricultural systems, restore natural resources, and improve climate resilience in agriculture throughout Asia and North Africa. It was held at leading research centers throughout India.
SK Chaudhari welcomed delegates to the course and stressed its practical character and efficacy in promoting CA management innovations, as evidenced by the significant achievements and international reputations of many former attendees and resource personnel.
“As climatic variability and change increase, the need to manage agronomic risks grows, and CA is an effective tool for farmers and scientists in both irrigated and rainfed systems,” said Chaudhari.
Twenty rising scientists from such fields as agronomy, soil science, plant protection, agricultural engineering, plant breeding, and extension, took part in the workshop where they gained a better understanding of all aspects of conservation agricultural methods in rainfed and irrigated ecosystems, as well as exposure to wide networks with prominent international scientists. Organizers prioritized the inclusion of female scientists, who made up 40% of attendees.
The workshop empowered participants to act as conservation agriculture ambassadors and champions of modern, novel agronomic methods when they return to their home institutions.
Rajbir Singh, ICAR assistant director general for Natural Resource Management, and ML Jat, global research program director of Resilient Farm and Food Systems, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) provided keynote addresses at the closing ceremony, held at the ICAR-Central Soil Salinity Research Institute in Karnal, Haryana, India.
The 2023 UN Climate Change Conference (COP 28) took place from November 30 to December 12, 2023, in Dubai, UAE. The conference arrived at a critical moment when over 600 million people face chronic hunger, and global temperatures continue to rise at alarming rates. CIMMYT researchers advocated for action into agriculture’s mitigating role in climate change, increasing crop diversity, and bringing the tenets of sustainability and regenerative agroecological production systems to a greater number of farmers.
Directly addressing the needs of farmers, CIMMYT proposed the creation of an advanced data management system, training, and protocols for spreading extension innovations such as digital approaches and agronomic recommendations to farmers via handheld devices to harmonize the scaling in Africa of regenerative agriculture—diverse practices whose outcomes include better productivity and environmental quality, economic feasibility, social inclusivity, and nutritional security.
CIMMYT presented research showing that in times of fertilizer shortages, targeting nitrogen supplies from inorganic and organic sources to farms with minimal access to nitrogen inputs can improve nitrogen-use efficiency and helps maintain crop yields while limiting harm from excesses in fertilizer use. Examining how food production is driving climate change, CIMMYT promoted ways to lessen climate shocks, especially for smallholder farmers who inordinately suffer the effects of climate change, including rising temperatures and extended droughts. Improved, climate-resilient crop varieties constitute a key adaptation. Boosting farmer productivity and profits is a vital part of improving rural livelihoods in Africa, Asia, and Latin America.
When asked about CIMMYT’s contribution to COP 28, Bram Govaerts, CIMMYT’s director general, highlighted the inclusion of agriculture in the COP28 UAE Declaration on Sustainable Agriculture, Resilient Food Systems, and Climate Action as part of various potential solutions for climate change, an effort that CIMMYT supported through advocacy with leaders and government officials.
“Our participation addressed some of the pressure points which led to this significant recognition. It further cleared our role as an active contributor to discussions surrounding the future of food and crop science,” said Govaerts.
Sarah Hearne presents on the potential of crop diversity to help combat climate change impacts on agrifood systems. (Photo: Food Pavilion/COP 28)
Hearne explained the process that characterizes plant DNA to identify the ideal, climate-adaptable breeding traits. This classification system also opens the door for genetic modeling, which can predict key traits for tomorrow’s climatic and environmental conditions.
“Our thinking must shift from thinking of gene banks to banks of genes, to make vibrant genetic collections for humanity, opening up genetic insurance for farmers,” said Hearne.
Working towards a food system that works for the environment
With an increased strain on food production, sustainability becomes critical for long-term human and environmental health. Sarah Hearne and Tek Sapkota, agricultural systems and climate change senior scientist, from CIMMYT participated in a panel discussion: Responsible consumption and sustainable production: pathways for climate-friendly food systems. They shared how progress in genetic innovation and fertilizer use can contribute to sustainable consumption and a resilient food system.
Fertilizer use remains highly skewed, with some regions applying more fertilizer than required and others, like sub-Saharan Africa, not having sufficient access, resulting in low crop yields. However, to achieve greater food security, the Global South must produce more food. For that, they need to use more fertilizer. Just because increased fertilizer use will increase greenhouse gases (GHGs) emissions, institutions cannot ask smallholder farmers not to increase fertilizer application. Increased GHGs emission with additional fertilizer application in low-input areas can be counterbalanced by improving Nutrient-Use Efficiency (NUE) in high-output areas thereby decreasing GHGs emissions. This way, we can increase global food production by 30% ca with the current level of fertilizer consumption.
Tek Sapkota speaks on how sustainable and efficient fertilizer use can contribute to a resilient food system. (Photo: Food Pavilion/COP 28)
“This issue needs to be considered through a holistic lens. We need to scale-up already proven technologies using digital extensions and living labs and linking farmers with markets,” said Sapkota.
On breeding climate-resilient seeds, Hearne addressed whether farmers are accepting new seeds and how to ensure their maximum adoption. Hearne detailed the partnership with CGIAR and NARS and the numerous technologies advancing the selection of ideal breeding traits, considering shortened breeding cycles, and responding to local needs such as heat or flood tolerance, and traditional preferences.
“Drought-tolerant maize, developed by CIMMYT and the International Institute of Tropical Agriculture (IITA), has benefited over 8 million households in sub-Saharan Africa, which proves that farmers are increasingly receptive to improved seeds. With a better selection of appropriate traits, we can further develop and distribute without yield penalties,” said Hearne.
Regenerative and agroecological production systems
Researchers have studied regenerative and agroecological production systems for decades, with new and old research informing current debates. These systems restore and maintain ecosystems, improving resource use efficiency, strengthening resilience, and increasing self-sufficiency. In his keynote presentation, Sapkota presented 3 examples of regenerative agriculture and agroecological systems: conservation agriculture, cropping system diversification and site-specific nutrient management and their impact on food production, climate change adaptation and mitigation.
“As the science continues to develop, we need to harness digital capacity to co-create sustainable solutions alongside local, indigenous knowledge,” said Sapkota. “While we should continue research and innovation on cutting-edge science and technologies, we should also invest in knowledge sharing networks to spread access to this research; communication is fundamental for further adoption of these practices.”
To address agriculture’s 25% contribution to global greenhouse gas emissions, researchers created AGREE. This user-friendly tool, which UC Davis and CIMMYT developed, helps estimate emissions from various agricultural activities.
Millions of rural Indians, mostly farmers, are at the mercy of changing weather and climate change. Rising temperature and heat stress, unpredictable rainfall patterns, increasing drought-like situations, soil erosion and depleting water tables are leading to poorer yields and reduced income for farmers. While the agricultural sector and farmers are most affected by the adverse impacts of climate change, it is also one of the sectors significantly responsible for greenhouse gas emissions, contributing about 14% of the total greenhouse gas emissions in the country.
Farmer Rahul Rai prepares his field for wheat plantation with zero tillage – Buxar, Bihar (photo: Deepak K. Singh/CIMMYT)
Good agronomy and soil management through conservation agriculture practices such as no-till farming, crop rotation, and in-situ crop harvest residue management are resource efficient and help reduce greenhouse gas emissions significantly. The intensification of these conservation agriculture practices by the Cereal Systems Initiative for South Asia (CSISA)—a regional project led by CIMMYT to sustainably enhance cereal crop productivity and improve smallholder farmers’ livelihoods in Bangladesh, India, and Nepal—and partners is helping smallholder farmers to improve their yield and income with less input costs.
Climate smart agriculture
Over 70% of Bihar’s population is engaged in agriculture production, with wheat and rice as the two major crops grown in the state. Bordering Uttar Pradesh, Buxar, is one of the many rural districts in Bihar, with over 108,000 hectares of land used for agriculture. The area is plain, fertile and has good irrigation facilities. The rice-wheat cropping system forms the dominant practice here, and pulses and other non-cereal crops are grown additionally during winters.
CSISA began promoting zero tillage in wheat cultivation in the area in 2010. Along with Krishi Vigyan Kendras (KVKs), and local agriculture departments, awareness and frontline demonstrations on different best management practices were conducted to inform farmers of alternative approaches to cultivating wheat and rice sustainably. Farmers were used to conventional farming methods, with more input costs and labor-intensive practices. In addition, as farmers were growing long-duration rice varieties, they typically sowed wheat in late November to early December, which meant harvesting in late April/May. Harvesting wheat this late caused yield losses due to terminal heat stress at the grain filling stage. With increasingly hot temperatures in recent years due to climate change, yield loss in wheat is imminent.
To help curb these yield losses, researchers and officials began promoting early sowing of wheat through a technology called zero tillage in the region, with sowing recommended before mid-November. As expected, this helped farmers to escape high temperature stress at the time of the dough stage, thus, saving grain shrinkage and yield loss at harvest. Zero tillage technology is a tested method with the potential to increase crop productivity through better time management and reduced input cost.
Deepak Kumar Singh, scientist at CSISA who has been supporting agri-extension efforts in the region for nearly a decade recalled how CSISA and partners were able to get more farmers on board with zero tillage and early wheat sowing:
“The best practices of zero till technology and early wheat sowing were encouraged widely through exposure visits, demonstration trials on progressive farmers’ fields, and providing support from local KVKs for machines and quality seeds, including the promotion of private service providers,” he said.
As more farmers were reached through field events, with visible on-field results during public harvest activities held at demonstration fields by CSISA and KVKs, the region gradually adopted early wheat sowing, zero tillage and direct seeded rice technologies. Currently, in the district, it is estimated that over 40% of wheat cultivation under the rice-wheat system is through zero till, helping farmers obtain better yield and profits.
Rice-wheat cropping systems, resilient and sustainable in increasingly changing climate
Rajapur, a small village in Buxar district, boasts 100% adoption of zero tillage in wheat cropping. We met farmer Rahul Rai whose family has been involved in farming for generations. The family owns over thirty acres of land with agriculture as the primary source of income. His father and his siblings were used to conventional farming methods. The produce from their farm was sufficient for household consumption and with the little extra left, they sold and made some income. On the significance of agriculture and farming for his family, Rahul Rai says, “this farmland has been feeding and supporting 17 members in our joint household.”
When young Rahul Rai got down to work in the family fields in the early 2000s, he was keen to explore possibilities to improve the income generated from the farm. Initially, like many others, he was engaged in intensive farming. According to Rai, “with the input costs rising daily, including scarce labor and soil health deterioration, bringing in some extra income seemed unsustainable”.
He first met researchers from the CSISA project and local KVK scientists in early 2011 in the neighboring village. The team was there to inform farmers about conservation agriculture practices and how to better manage yield and maintain soil health. Rai soon became more curious about the benefits of adopting these new methods over conventional practices. He started with a few acres with zero tillage and began sowing wheat by early November, as recommended by the scientists. In Rabi 2022-23, his wheat fields were sown by November 11, compared to the early years when the sowing date was around December.
Wheat yield data gathered meticulously over a decade from Rahul Rai’s fields (Data: CSISA MEL team)
With more participation and engagement with CSISA, in 2017, he joined other farmers from the region on an exposure visit to Patna organized by the CSISA-KVK network. In Patna, at the Indian Council of Agri Research – Research Complex for Eastern Region (ICAR-RCER), Rai and the visiting farmers were introduced to conservation agri-technologies for rice-wheat and other cropping systems. During the visit, they were informed about crop rotation and diversification, new seed varieties that are resilient and adaptable to changing climates, efficient use of plant protection chemicals and fertilizer and various subsidies from the center/state government to farmers. He later accompanied other progressive farmers on a CSISA-led travel seminar to Gorakhpur in 2017, where he observed acres and acres of wheat fields cultivated through zero tillage and early sowing that had yielded 6-7 tons per hectare (t/ha) on average.
At present, Rai’s family cultivates only zero till wheat in their fields and direct seeded rice on a few acres where irrigation facilities are well established. Rai asserts that until 2014, the wheat yield was about 10-15 quintals per acre (3.5-4 t/ha), rising to around 20-25 quintals per acre on average (5.5 t/ha in 2023) in recent years, thanks to conservation agriculture practices.
Today, the CSISA team has system optimization and demonstration trials on fields owned by Rai’s family where they conduct trials to demonstrate the importance and feasibility of different agri-practices and compare yields at harvest. Rai, a champion farmer who has been involved with CSISA for nearly a decade, said, “I am a collaborator with CSISA now. The data gathered from my fields on the compounding benefits of conservation agriculture technologies is used to promote the best practices and technology adoption across our district and state.”
One village at a time
Presently, Rajapur village has 100% zero tillage adoption. Despite most farmers being smallholders, this level of zero tillage adoption in wheat is impressive. Zero-till-based crop establishment, with appropriate diversification in crops grown, is economically beneficial and improves soil health. All these practices and technologies ensure lower greenhouse emissions and support climate change mitigation efforts. Above all, smallholder farmers are food secure and contributing in their small way to national and global food security.
To scale the adoption of conservation agriculture practices, CSISA and partners are collaborating with farmers in the district/state – many of whom are already 50-80% in zero tillage adoption. The team on the ground are conducting system optimization trials on farmers’ fields to generate data and evidence to support and strengthen policies and assist in integrating market intelligence to support access and availability of technology to all smallholders. Every year steadily, through a smallholder farmer, a village, a district, the effort is to slowly expand the area under conservation agriculture across the state and region and ensure increased system productivity and sustainability of agriculture.
