When a non-farmer looks upon a field, they might just see it as an expanse of dirt and give no more thought to it. But to a farmer, that dirt is soil, the lifeblood of agriculture. Among other things, soil delivers necessary nutrients to crops, allowing them to grow and flourish.
About 95% of the food consumed around the world grows from soil, which is rapidly deteriorating because of unsustainable human activity. Around 33% of all soils around the world are degraded, meaning they can no longer sustain the same level of agricultural activity. This leads to lower crop yields, which potentially leads farmers to increase their use of fertilizer to overcome the damaged soil. But increased nitrogen fertilizer use has profound climate change effects, as poor fertilizer management, including overuse, can lead to nitrous oxide (a greenhouse gas) leaking into the air and nitrates into groundwater, rivers, and other water systems.
Sampling points in the state of Celaya, Guanajuato Mexico. (Photo: CIMMYT)
An important implement in the effort to preserve soil fertility is the practice of soil mapping, a process which produces detailed physical and chemical soil properties within a region. Things like the amount of nutrients, acidity, water conductivity, and bulk density, help guide decision making from individual farmers all the way to regional and national stakeholders.
The Sustainable Productivity Growth Coalition, a United Nations initiative which aims to accelerate the transition to more sustainable food systems through a holistic approach to productivity growth to optimize agricultural sustainability, featured soil mapping as an innovative, evidence-based approach for accelerating sustainable productivity growth in its 2023 report.
A global soil mapping initiative is underway led by the Food and Agriculture Organization of the United Nations (FAO) and the Global Soil Partnership with important contributions from CIMMYT scientist working in Mexico.
“Soil mapping of an agricultural region for chemical and physical soil properties offers a range of benefits that can significantly improve agricultural practices, land management, and overall productivity,” said Ivan Ortiz Monasterio, CIMMYT principal scientist.
Map for Phosphorus Bray 1. (Photo: CIMMYT)
Soil maps = blueprints
Using up-to-date soil information at the national scale can help to plan agricultural and land planning interventions and policies, by excluding areas with higher carbon content or fertility from urbanization plans, or by planning the implementation of irrigation schemes with high-quality water in salt-affected areas.
For farmers, there are many benefits, including the creation of nutrient management plans, which are perhaps the most important. These plans guide decisions about application rates and timing of inputs like fertilizers, help avoid over-application, and reduce the risk of runoff and pollution. This supports sustainable agriculture while reducing costs and minimizing nutrient pollution.
Map for zinc. (Photo: CIMMYT)
“There are many other benefits,” said Ortiz Monasterio. “From improved irrigation management, to informed crop decisions, to things like climate resilience because more fertile soils are better able to cope with the challenges of climate variation.”
Healthy soybean fields. (Photo: Peter Setimela/CIMMYT)
Soybeans are a significant source of oil and protein, and soybean demand has been increasing over the last decade in Malawi and Zambia. Soybean contributes to human nutrition, is used in producing animal feed, and fetches a higher price per unit than maize, thus serving as a cash crop for smallholder farmers. These are among the main factors contributing to the growing adoption of soybean among smallholder producers. In addition, soybean is a vital soil-fertility improvement crop used in crop rotations because of its ability to fix atmospheric nitrogen. To a large extent, soybean demand outweighs supply, with the deficit covered by imports.
Soybean production in sub-Saharan Africa is expected to grow by over 2% per annum to meet the increasing demand. However, as production increases, significant challenges caused by diseases, pests, declining soil fertility, and other abiotic factors remain. According to official government statistics, Zambia produces about 450,000 tonnes of soybean per annum, with an estimated annual growth of 14%. According to FAOSTAT, this makes Zambia the second largest soybean producer in the southern African region. Although soybean was traditionally grown by large commercial farmers in Zambia, smallholders now account for over 60% of the total annual soybean production.
Production trends show that smallholder soybean production increased rapidly in the 2015–2016 season, a period that coincided with increased demand from local processing facilities. As smallholder production continued to increase, in 2020, total output by smallholder farmers outpaced that of large-scale farmers for the first time and has remained dominant over the last two seasons (Fig 1). However, soybean yields among smallholder farmers have remained low at around 1 MT/HA.
Figure 1. Soybean production trends by smallholders and large-scale farmers. (Photo: Hambulo Ngoma/Zambia Ministry of Agriculture, Crop Forecast Survey)
Soybean production in the region is threatened by soybean rust caused by the fungus Phakopsora pachyrhizi. The rust became prevalent in Africa in 1996; it was first confirmed in Uganda on experimental plots and subsequently on farmers’ fields throughout the country. Monitoring efforts in the U.S. have saved the soybean industry millions of dollars in fungicide costs due to the availability of accurate disease forecasting based on pathogen surveillance and environmental data.
Soybean rust disease is spread rapidly and easily by wind, and most available varieties grown by farmers are susceptible. The above-normal rainfall during the 2022–2023 season was conducive to the spread of the fungus. A recent survey of over 1,000 farm households shows that 55% and 39% of farmers in Zambia and Malawi, respectively, were affected by soybean rust during the 2022–2023 season. The lack of rust-tolerant varieties makes production expensive for smallholder farmers who cannot afford to purchase fungicides to control the pathogens. It is estimated that soybean rust can cause large yield losses of up to 90%, depending on crop stage and disease severity. Symptoms due to soybean rust infection may be observed at any developmental stage of the plant, but losses are mostly associated with infection from the flowering stage to the pod-filling stage.
Soybean plants affected by soy rust. (Photo: Peter Setimela)
Mitigation measures using resistant or tolerant varieties have been challenging because the fungus mutates very rapidly, creating genetic variability. Although a variety of fungicides effective against soybean rust are available, the use of such fungicides is limited due to the high cost of the product and its application, as well as to environmental concerns. Due to this restricted use of fungicide, an early monitoring system for detecting rust threats for steering fungicide might only be relevant for large-scale producers in eastern and southern Africa. With the massive increase in the area under soybean production, soybean rust is an important disease that cannot be ignored. Host-plant resistance provides a cheaper, more environmentally friendly, and much more sustainable approach for managing soybean rust in smallholder agriculture that characterizes the agricultural landscape of eastern and southern Africa.
To advance the use of rust-tolerant varieties, the Southern Africa Accelerated Innovation Delivery Initiative (AID-I) Rapid Delivery Hub, or MasAgro Africa, is presently concluding surveys to assess farmers’ demand and willingness to pay for rust-tolerant varieties in Malawi and Zambia. The results from this assessment will be valuable to seed companies and last-mile delivery partners to gain a better understanding of what farmers need and to better serve the farmers. This coming season AID-I will include rust tolerant varieties in the mega-demonstrations to create awareness about new varieties that show some tolerance to rust.
Staff of the Nepal Seed and Fertilizer (NSAF) project conducted a three-day “training of trainers” workshop on integrated soil fertility management and related practices for commercial rice farming, for 50 agricultural technicians from 50 farm cooperatives in districts of mountainous midwestern Nepal and its lowland Terai Region.
Held in Nepalgunj, midwestern Nepal, the workshop focused on the “4Rs” for soil fertilization—right source, right rate, right time, and right place—along with other best farming and soil nutrient stewardship practices for rice-based farming systems.
“Subject matter was comprehensive, covering variety selection, transplanting, weeding, management of nursery beds, fertilizer, irrigation, controlling pests and diseases and proper handling of rice grain after harvest,” said Dyutiman Choudhary, NSAF project coordinator and scientist at CIMMYT. “Topics relating to the integrated management of soil fertility included judicious application of organic and inorganic fertilizer, composting and the cultivation of green manure crops such as mungbean and dhaincha, a leguminous shrub, were also included.”
Support to sustainably boost Nepal’s crop yields
With funding from the United States Agency for International Development (USAID), the NSAF project promotes the use of improved seeds and integrated soil fertility management technologies, along with effective extension, including the use of digital and information and communication technologies.
Agriculture provides livelihoods for two-thirds of Nepal’s predominantly rural population, largely at a subsistence-level. Rice is the nation’s staple food, but yields are relatively low, requiring annual imports worth some $300 million, to satisfy domestic demand.
Workshop participants attended sessions on digital agri-advisories using the Geokrishi and PlantSat platforms and received orientation regarding gender and social inclusion concerns and approaches—crucial in a nation where 70% of smallholder farmers are women and exclusion of specific social groups remains prevalent.
“Topics in that area included beneficiary selection, identifying training and farmer field day participants, and support for access to and selection of improved seed and small-scale farm equipment,” explained Choudhary. “The participants will now go back to their cooperatives and train farmers, local governments and agrovets on improved rice production.”
Nepal scientists and national research programs have partnered with CIMMYT for more than three decades to breed and spread improved varieties of maize and wheat and test and promote more productive, resource-conserving cropping systems, including rotations involving rice.
Thomas A. Lumpkin, talks to China Today about his views on global coordination and cooperation, and reiterates his belief that China and the U.S. should play a leading role by working together. Lumpkin also discusses his interest in China’s traditional farming techniques and calls for stronger bilateral cooperation to address common global challenges.
Leveraging the leadership, science, and partnerships of the Mexico-based CIMMYT and the funding and research capacity of Mexico’s Secretariat of Agriculture and Rural Development (SADER) during 2010-21, the program known as “MasAgro” has helped up to 500,000 participating farmers to adopt improved maize and wheat varieties and resource-conserving practices on more than 1 million hectares of farmland in 30 states of Mexico.
Tlaltizapan Experimental Station in Morelos, Mexico is used through the winter for drought and heat trials and through the summer for yield-trials and biofortification. (Photo: Alfonso Cortés/CIMMYT)
As a result of MasAgro research hubs operating across Mexico’s multiple and diverse agroecologies to promote the sustainable intensification of maize and wheat farming systems — including improved varieties and resource-conserving, climate-smart practices — yields of project participants for maize were 20% higher and for wheat 3% higher than local averages. Similarly, average net incomes for participating maize farmers were 23% greater and 4% greater for wheat farmers, compared to local averages.
The MasAgro biodiversity component gathered and analyzed one of the world’s largest-ever samplings of maize and wheat genetic diversity, including CIMMYT’s own vast seed bank collections, to help identify and characterize new genes of interest for breeding. As one result, more than 2 billion genetic data points and over 870,000 data entries from associated field trials are freely available to the scientific community, via the project’s online repository.
MasAgro has involved national and local research organizations, universities, companies, and non-government organizations working through more than 40 research platforms and 1,000 demonstration modules, while building the capacity of thousands of farmers and hundreds of technical and extension experts who serve them.
State-level partners sign on to MasAgro
Through MasAgro, CIMMYT entered into research and development partnerships with 12 Mexican states. An example is the mountainous, central Mexican state of Guanajuato, home to the El Bajío region, one of Mexico’s most productive farm areas but which also suffers from soil degradation, water scarcity, and climate change effects — challenges faced by farmers throughout Mexico. The governor of Guanajuato visited CIMMYT headquarters in Mexico in June 2023 to review progress and agree on follow-up activities.
MasAgro generated more sustainable production and irrigation systems in Guanajuato, Mexico. (Photo: ACCIMMYT)
CIMMYT has worked with Guanajuato state and local experts and farmers themselves to test and promote innovations through 7 research platforms reaching nearly 150,000 hectares. As of 2020, new crop varieties and resource-conserving, climate-smart management practices had helped underpin increases of 14% in irrigated wheat production and, under rainfed farming systems, improved outputs of 28% for beans, 150% for local maize varieties and 190% for hybrid maize, over state averages.
An integral soil fertility initiative has included the analysis and mapping of more than 100,000 hectares of farmland, helping Guanajuato farmers to cut costs, use fertilizer more effectively, and reduce the burning of crop residues and associated air pollution.
Service centers for the rental and repair of conservation agriculture machinery are helping to spread practices such as zero tillage and residue mulches. Supported by CIMMYT advisors, Guanajuato farmers are entering into equitable and ecologically friendly production agreements with companies such as Nestle, Kellogg’s, and Heineken, among other profitable and responsible public-private arrangements.
Acclaim and interest abroad for MasAgro
MasAgro has received numerous awards and mentions as a model for sustainable agricultural development. A few examples:
Dignitaries applaud MasAgro launch at CIMMYT. (Photo: Xochiquetzal Fonseca/CIMMYT)
The Inter-American Development Bank (IDB) mentioned the program as an example of successful extension.
The Organization for Economic Cooperation and Development (OECD) cited MasAgro for promoting productive and sustainable agriculture.
The United Nations Development Program (UNDP) lauded MasAgro for promoting climate-resilient agriculture.
During the 2018 G20 summit in Argentina, MasAgro was considered a model for coordinating agricultural research, development, innovation, technology transfer, and public-private partnerships.
Bram Govaerts, now Director General of CIMMYT, received the 2014 Norman Borlaug Field Award for his work at the time as leader of MasAgro’s farmer outreach component.
MasAgro research hubs were recently used as a guide by USAID for efforts in Sudan and Eastern Africa. They have also been replicated in Guatemala and Honduras.
Moving out and beyond
In Central America and Mexico, the inter-connected crises of weak agri-food systems, climate change, conflict, and migration have worsened, while small-scale farmers and marginalized sectors remain mired in poverty.
Capitalizing on its experience in MasAgro, CIMMYT is a major partner in the recently launched CGIAR initiative, AgriLAC Resiliente, which aims to build the resilience, sustainability, and competitiveness of agrifood systems and actors in Latin America and the Caribbean, helping them to meet urgent food security needs, mitigate climate hazards, stabilize vulnerable communities, and reduce forced migration. The effort will focus on farmers in Colombia, El Salvador, Honduras, Mexico, Nicaragua, and Peru.
Farmer Marilu Meza Morales harvests her maize in Comitán, Mexico. (Photo: Peter Lowe/CIMMYT)
As described in a 2021 science journal article, CIMMYT also helped create the integrated agri-food system initiative (IASI), a methodology that was developed and validated through case studies in Mexico and Colombia, and leverages situation analysis, model predictions, and scenarios to synchronize public and private action toward sustainable, equitable, and inclusive agri-food systems.
“CIMMYT’s integrated development approach to maize system transformation in Mexico and Colombia laid the foundations for the IASI methodology by overcoming government transitions, annual budget constraints, and win-or-lose rivalries between stakeholders, in favor of equity, profitability, resilience and sustainability,” said Govaerts.
The 2021 Global Agricultural Productivity (GAP) report “Strengthening the Climate for Sustainable Agricultural Growth” endorsed IASI, saying it “…is designed to generate strategies, actions and quantitative, Sustainable-Development-Goals-aligned targets that have a significant likelihood of supportive public and private investment.”
The Coalition on Sustainable Productivity Growth for Food Security and Resource Conservation (SPG Coalition) brings together researchers, non-governmental organizations, and private sector partners to advance a world with greater access to nutritious food and affordable diets. The Coalition recognizes that increasing the productivity of natural resources through climate adaptation and mitigation is instrumental to reaching this goal.
In a recent report, the SPG Coalition provides a path forward for NGOs, research institutions, and government agencies to strengthen agrifood and climate policies. The report contains real-life, evidence-based examples to further the sustainable production and conservation of natural resources, detailing the potential impacts on social, economic, and environmental conditions.
CIMMYT features prominently in the report as a leading organization focused on 4 main areas: climate-smart agriculture, nutrient-use efficiency (NUE), and pest and fertilizer management.
Nutrient-use efficiency and fertilizer management
While chemical fertilizers increase crop yields, excessive or improper use of fertilizers contributes to greenhouse gas emissions (GHG) and increases labor costs for smallholders. Efficient NUE is central to nutrient management and climate change mitigation and adaptation.
Women using spreader for fertilizer application. (Photo: Wasim Iftikar/CSISA)
In India, CIMMYT, along with the Borlaug Institute for South Asia (BISA), CGIAR Research Centers, and regional partners, tested digital tools like the Nutrient Expert (NE) decision support tool which measures proper fertilizer use for optimized yields and provides nutrient recommendations based on local soil conditions.
The majority of smallholders who applied the NE tool reported higher yields while emitting less GHG emissions by 12-20% in wheat and by around 2.5% in rice as compared with conventional fertilization practices. Farmers also recorded double economic gains: increased yields and reduced fertilizer costs. Wider government scaling of NE could enhance regional food security and mitigate GHG emissions.
The Feed the Future Nepal Seed and Fertilizer (NSAF) project, led by CIMMYT and USAID, advocates for climate-smart agriculture by linking smallholders with improved seed, providing capacity-building programs, and promoting efficient fertilizer use. With a vast network established with the support from the Government of Nepal, NSAF successfully provides smallholders with expanded market access and nutritious and climate-resilient crop varieties.
Climate-smart maize breeding
Since its arrival to sub-Saharan Africa (SSA) in 2016, fall armyworm (FAW) has devastated maize harvests for countless smallholders on the continent. Economic uncertainty caused by unstable yields and climate stressors like drought coupled with this endemic pest risk aggravating food insecurity.
Fall armyworm. (Photo: Jennifer Johnson/CIMMYT)
CIMMYT and NARES Partner Institutions in Eastern and Southern Africa are spearheading a robust pest management project to develop, screen, and introduce genetically resistant elite maize hybrids across SSA. South Sudan, Zambia, Kenya, and Malawi have already deployed resistant maize varieties, and eight other countries in the region are projected to release their own in 2023. These countries are also conducting National Performance Trials (NPTs) to increase awareness of host plant resistance for the sustainable control of FAW and to sensitize policymakers on accelerating the delivery of FAW-tolerant maize varieties.
The establishment of FAW screening facilities in Africa permits more rapid detection and breeding of maize varieties with native genetic resistance to FAW, facilitating increased deployment of these varieties across Africa. The sustainable control of FAW demands a rapid-response effort, overseen by research organizations and governments, to further develop and validate genetic resistance to fall armyworms. Achieving greater impact for maize smallholders is critical to ensuring improved income and food security in Africa. It is also paramount for biodiversity conservation and removing labor burden on farmers applying additional synthetic pesticides to prevent further losses by the pest.
“The SPG Coalition report emphasizes the power of partnership to enhance financial and food security for smallholder communities in the Global South. This is fully in line with the recently launched CIMMYT 2030 strategy. It’s also an important reminder to assess our strong points and where more investment and collaboration is needed,” said Bram Govaerts, CIMMYT director general.
Balancing the application of fertilizers based on the characteristics of soil leads to increased crop productivity, income, and fertilizer use efficiency unlike former “one size fits all” recommendations, said Bedu Ram Bhushal, Nepal’s Minister of Agriculture and Livestock Development (MoALD) during a press briefing earlier this month in Nepal’s capital Kathmandu.
Participants from the press release (Photo: Deepa Woli/CIMMYT)
“I congratulate NARC for this historical work on updating the fertilizer recommendations after 46 years,” Bhushal said. “Now, we should support the large-scale adoption of these new recommendations by farmers for sustainable soil fertility management.”
Earlier recommendations developed by the Agricultural Chemistry and Soil Science Service Section under the Department of Agriculture (DoA) in 1976 did not take into account soil diversity, biophysical conditions, and agronomic management. Nutrients recommended for a particular crop were the same for terai lowlands, hills, and mountains.
In general, soil fertility changes over time due to deployment of continuous intensive cropping systems. The new recommendations consider the indigenous nutrient supply of soils, target yields, and the amount of nutrients removed by crops at harvest.
Senior officials and dignitaries endorsed new fertilizer recommendation (Photo: Deepa Woli/CIMMYT)
It took six years for NSSRC of NARC in partnership with NSAF, to update the recommendations through nutrient omission and optimum nutrient rate trials in various locations. By using advanced analytical methods and machine learning tools for extrapolating data across different agroecological zones and domains, they were able to make them site-specific.
Other factors considered, included attainable yield at a particular farm, soil fertility status, agro-climate, crop management practices, and the amount of nutrients to be supplied to fill the gap between crop nutrient removal and soil nutrient supply of nitrogen, phosphorus, and potassium. Micronutrients and organic inputs were also considered.
These recommendations were presented to leading soil scientists and agronomists from NARC and MoALD and were validated at national meetings in July and October 2022.
The Honorable Minister of MoALD, Bedu Ram Bhusal reviewed the press release (Photo: Deepa Woli/CIMMYT)
The new recommendations were included in the DoA’s agriculture extension guidelines in 2023, to achieve potential yield at the farm level and to link with the extension system through the three-tier of governments for its extensive use throughout the country. The new approach is part of CIMMYT’s efforts to support the NARC, MoALD, provincial agriculture ministries, and farmers to build indigenous soil fertility management resources and capabilities and promote locally adapted strategies for long-term resilience by using integrated soil fertility management approaches.
Samantha Power, Administrator for USAID, in an interaction with colleagues from SSSC and CIMMYT in Nepal. (Photo: Kaji Ram Bhatta/CIMMYT)
On February 7, Samantha Power, Administrator for the United States Agency for International Development (USAID), visited SEAN Seed Service Centre (SSSC) in Thankot, Nepal. Her time at the seed company — which is supported by the Nepal Seed and Fertilizer (NSAF) project — provided an opportunity to learn more about how private sector support for agribusiness can help accelerate Nepal’s agricultural transformation.
The event began with a tour of the company’s facilities and seed lab, where Power met with breeders and employees responsible for sorting and grading seeds. Other stops on the visit included meetings with SSSC management and researchers from the International Maize and Wheat Improvement Center (CIMMYT), who explained the important role the private sector plays in the country’s seed sector, from the development of climate stress tolerant varieties to facilitating seed access and distribution.
The Administrator and USAID officials at a round table with private sector on transforming Nepalese agriculture. (Photo: Kaji Ram Bhatta/CIMMYT)
Later in the day, Power participated in a round table discussion with agribusiness entrepreneurs from seed and agricultural production companies, fertilizer manufacturers and distributors, and farmers cooperatives to better understand the key challenges and opportunities in fostering agricultural transformation in Nepal. The talks focused on the need for reforms on seed and fertilizer markets and elimination of market distorting policies such as unplanned subsidies, as well as the need to facilitate access to finance to boost investments and insurance to manage risks.
Key recommendations from participants included increased use of technologies — such as improved seeds, machineries, improved soil fertility management and digital tools — as well as the creation of a more enabling environment for attracting private sector investment and increasing agricultural participation among youth and disadvantaged communities in Nepal. The private sector plays a critical role in bolstering national food security, increasing economic growth, and creating transformative change in the country’s agricultural sector so it can be more commercial, competitive, and inclusive. Participants provided suggestions on how the Government of Nepal could further support the sector, allowing agribusinesses to develop and grow in order to cater to the needs of smallholder farmers and consumers.
CIMMYTs Nepal Seed and Fertilizer (NSAF) project is funded by the United States Agency for International Development (USAID). It aims to develop competitive and vibrant seed and integrated soil fertility management (IFSM) systems for inclusive and sustainable growth in agricultural productivity, business development, and income generation in Nepal.
Farmer applying urea with a spreader in a rice field. Photo Uttam Kunwar/ CIMMYT
After four decades, new site-specific fertilizer recommendations for rice have been introduced in Nepal that will help farmers increase the crop’s productivity by 10-30%, compared to their current practices.
The Ministry of Agriculture and Livestock Development (MoALD) endorsed the new fertilizer recommendations for rice crop at a consultative workshop in July 2022 held in Kathmandu. Developed by the International Maize and Wheat Improvement Center (CIMMYT), in close collaboration with the Nepal Agriculture Research Council’s (NARC) National Soil Science Research Center (NSSRC) and International Fertilizer Development Center (IFDC), the new regime replaces the existing blanket approach of recommendations to help increase crop yields and fertilizer use efficiency.
The blanket approach assumed the whole country as one domain despite the heterogeneity in soils, other biophysical conditions and agronomic management practices, including crop varieties. As a result, fertilizers were under-utilized in low fertile soils or overused in farms with high soil fertility status, thereby farmers were not able to obtain the achievable yield.
Unlike the generic recommendations, the site-specific fertilizer management will help farmers to determine the crop’s fertilizer requirements based on soil fertility status of a particular farm, attainable yield target of the selected crop variety, crop’s yield response to fertilizers and agronomic management practices, such as irrigation, cropping systems etc. In other words, this new regime allows farmers to produce more with less fertilizers through a balanced application of fertilizers based on available soil properties.
Old is not always gold
Generally, soil fertility status changes every 3-5 years when there is continuous nutrient removal from soils due to an intensive cropping system with the adoption of high nutrient demanding improved and hybrid varieties. Thus, soil fertility management recommendations should be updated periodically but the existing recommendations were not updated since 1976.
Realizing the limitations, CIMMYT through the Nepal Seed and Fertilizer (NSAF) project, supported by USAID, worked with NSSRC and IFDC to formulate fertilizer recommendations for major cereal crops and vegetables for specific domains of the country.
Under NSSRC’s leadership, a ‘Fertilizer Recommendation Committee’ comprising of a dedicated team of soil scientists within NSSRC and NSAF experts was formed to develop site-specific fertilizer recommendations using the Soil-SMART framework for delivering balanced fertilizers to farmers. Based on soil fertility status, agro-climate, irrigation regimes and geography, the country was divided into six soil fertility domains — four in the Terai region (Eastern, Central, Western and Far-western), one in inner Terai and one in the hills. Under each domain, recommendations were based on the attainable yield, crop variety, and irrigation regime.
This approach was first tested for rice crop.
Formulating new recommendations for rice
Three fundamental steps were used to develop site-specific fertilizer recommendations, which included: i) selection of yield goal, ii) estimation of crop nutrient requirement, and iii) estimation of indigenous nutrient supplies. To collect this information, NSAF and the committee designed field trials on nutrient omission and nutrient rates to determine the yield limiting nutrients and their optimum rate, respectively. Data from fertilizer trials conducted by different research institutes and universities, including trials from the project sites were collected and analyzed by the team to see the crop’s yield response to fertilizers. A modeling approach called Quantitative Evaluation of fertility of the tropical soils (QUEFTS) was also used to estimate the indigenous nutrient supply and attainable yield target of rice for different soil fertility domains. This model was applied as an alternate to extrapolate recommendations in areas where field data were not available, considering large financial and human resources required otherwise to conduct numerous field trials across different soil types and agro ecological zones. The model was validated with field trial data before making extrapolation of the recommendations. The QUEFTS model used soil properties from Nepal’s first digital soil map to identify nutrient status and deficiency.
In addition to agronomic optimum rate, an economic analysis was also conducted to see economic variability of the recommendations.
The newly developed recommendations provide guidance for balanced fertilization as it includes micronutrients zinc and boron, and organic inputs in addition to three major nutrients —Nitrogen, Potassium and Phosphorous (NPK). Results from field trials suggested that the new recommendation could increase rice productivity by 10-30% compared to existing farmers’ practice.
Infographic on developing domain specific fertilizer recommendations.
Advocating for endorsement
A three-day workshop was organized by CIMMYT and NSSRC to primarily share and approve the recommended fertilizer dose for rice crop as well as its relevance to achieve potential yield at farm level. Rajendra Mishra, joint secretary of MoALD inaugurated the event that was chaired by the Director of NARC’s Crop and Horticulture Research. Workshop attendees included MoALD, NARC, Department of Agriculture, USAID Nepal, secretaries from the Province Ministry of Land Management, soil scientists, university professors, agronomists and other high-level government officials.
During the workshop, NSAF explained the application of QUEFTS model with reference to the case of rice based on the field trial data for domain specific fertilizer recommendations. Shree Prasad Vista, soil scientist at NSSRC, summarized the results for rice as the approach and facilitated its approval from MoALD. The participants also discussed on strategies to link with the extension system to reach a large number of farmers through the three-tier governments. Fourteen research papers on nutrient management for major cereal crops were also reviewed at the event.
“I congratulate NARC for this historical work on updating the fertilizer recommendations after 46 years. Now, we are moving towards sustainable soil fertility management by adopting site-specific fertilizer recommendations,” said MoALD Secretary Govinda Prasad Sharma.
Although the recommendation for rice was a significant output of the workshop, fertilizer recommendations for other major crops will be carried out following a similar process.
NARC’s Executive Director Deepak Bhandari commented, “It is our pleasure to move from a blanket approach to site-specific approach. This is a milestone for agricultural research in the country and I would like to thank all the scientists, NSAF project and USAID’s support for this notable achievement.”
Similarly, speaking at the event, Jason Seuc, Director of Economic Growth Office at USAID Nepal, emphasized the importance of soil fertility management for achieving food security targets set by the Government of Nepal. Seuc remarked that a sustainable soil fertility management is critical not only for food security but also for reducing the environmental pollution.
