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Nepal Government endorses new site-specific fertilizer recommendations for rice

Written by Sarah Fernandes on August 9, 2022. Posted in Blogs.

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.

Worsening food insecurity calls for stress-tolerant seeds

Written by Sarah Fernandes on August 9, 2022. Posted in In the media.

From chemical fertiliser shortages to lack of irrigation, farmers in Nepal have been facing a multitude of human-induced problems every year. The most urgent concern is the climate crisis.

Erratic weather patterns, untimely and uneven rainfall and rapidly rising temperatures have got farmers by the scruff of their necks.

For the farmers, such dramatic climate change manifests in the form of floods, droughts and landslides, directly hitting their agriculture-dependent livelihoods. For the nation as a whole, the climate crisis worsens food insecurity.

The tales of the climate crisis are petrifying. However, not all hope is lost.

Interventions such as climate resilient seeds that are tolerant to extreme climatic stresses like drought, flooding or submersion have been discovered and implemented in phases, according to scientists, to help sustain agricultural productivity.

“Due to the increasing climate change impacts, farmers are facing challenges to produce traditional seeds used during normal situations,” says AbduRahman Beshir Issa, seed systems lead at the International Maize and Wheat Improvement Centre, South Asia Office.

“In Nepal, farmers are witnessing both drought stress and excess moisture during the summer cropping season. In the spring season, high temperatures, coupled with drought stress, make it difficult for normal seeds or varieties to grow.”

With an increasing number of mouths to feed, and more pronounced effects of climate change yet to present themselves, climate-resilient seeds can help sustain Nepal’s agricultural productivity, according to crop development experts.

“Climate resilient seeds are crucial for food security. In addition, these crops are nutritionally important,” said Prakash Acharya, a senior crop development officer at the Seed Quality Control Centre. “With changing climate, not all crops and seeds can endure even two-three days of drought or submergence or extreme heat.”

Approximately 3 million hectares of land is cultivated in Nepal, which is 21 percent of the total land area. Rice, maize and wheat constitute more than 80 percent of cereal acreage and production.

The overall cereal yield in Nepal is 2.6 tonnes per hectare, which is far lower than the regional and global average of 4.1 tonnes per hectare, indicating an overall low productivity.

Paddy constitutes the highest production, commanding a 20.8 percent share in the agriculture gross domestic product (AGDP).

Nepal’s economic wellbeing is intimately linked with the monsoon. Water from the skies is the lifeblood of Nepal’s Rs4.85 trillion economy which is farm-dependent, as nearly two-thirds of the farmlands are rain-fed.

A large part of the country gets nearly 80 percent of its annual rainfall during the four months—June to September.

The production of food grains, mainly rice, depends on the amount and distribution of monsoon rainfall over the country. The monsoon rains also replenish ground water and reservoirs critical for drinking and power generation.

Analysing data from the past 33 years of minimum and maximum temperatures and rainfall, scientists predict drought to be the most important limiting factor for crop production, including paddy.

As paddy is sensitive to drought due to its high water requirement, scientists say there is a need for promoting “climate change-ready rice” that can tolerate drought for up to months.

For instance, research in Nawalparasi in the central Tarai found that the existing paddy varieties would not sustain the yield potential of the present level after 2020.

In October 2021, unusual weather patterns led to a torrential downpour lasting three days, causing massive loss of agricultural harvests and physical infrastructure across many parts of Nepal.

In 2020, in East Rukum, continuous rainfall from January to September decreased maize yield. The drought that followed then destroyed the wheat crop. Right after, the heavy rains also wiped out potatoes and maize.

Climate projections further suggest changes in precipitation during the monsoon period (with variations from 14 percent to 40 percent), as well as the increased likelihood of heavy precipitation events.

Experts are concerned that such unpredictable changes in weather patterns will lead to a decline in agricultural productivity, further worsening food insecurity in the region.

“We aren’t food secure right now as well. And with climate change, it is only getting worse. In the long run, the condition of food security in Nepal will be alarming,” says Yamuna Ghale, agriculture and food security policy analyst who is also research director at the Nepal Centre for Contemporary Research.

Around 65 percent of Nepal’s population depends on agriculture for its livelihood, which accounts for 25 percent of the GDP.

With the increasing population and declining agricultural productivity, experts say that Nepal could sooner or later face food insecurity.

“Everyone has the right to food. But the current situation indicates that a food shortage is looming,” said Ghale, who is also an expert at the Food Security Coordination Committee under the Ministry of Agriculture and Livestock Development. “We have to focus on climate-smart alternatives now, beginning with climate-resilient seeds.”

Climate-resilient seeds can withstand extreme conditions brought about by climate change. For example, drought-tolerant seeds can sustain periods of dry conditions, and submergence-tolerant seeds can withstand flood stress.

For example, improved varieties like Sukkhaa Dhan 4, Sukkhaa Dhan 5 and Sukkhaa Dhan 6 have an average yield of 4-4.5 tonnes per hectare, and under good irrigation conditions, the output can go up to 5.5 tonnes per hectare on an average.

Sukkhaa 6 has the ability to re-grow even two weeks after submergence.

Swarna Sub-1, Sambha Mansuli Sub-1, Cherang Sub-1, Gangasagar-1, and Gangasagar-2 are submergence-tolerant paddy varieties.

Rice varieties like Bahuguni-1 and Bahuguni-2 are both drought and submergence tolerant.

Similarly, maize varieties that are drought tolerant, such as Deuti, Manakamana-5 and Manakamana-6 are also available. Rampur hybrid-10 and Rampur hybrid-12 are heat-tolerant varieties.

Seto Kaguno is a promising variety of foxtail millet that is drought-tolerant and extremely climate-resilient.

Paddy varieties which possess the “Sub1A” gene remain dormant during submergence, and conserve energy until the floodwaters recede. Paddy plants with the “Sub1A” gene can survive more than two weeks of complete submergence. The plant recovers well from drought by growing new shoots.

“A character is incorporated into existing rice varieties to make them stress-tolerant or climate-resilient. This makes them fare better than traditional crops,” said Acharya.

“In very recent years, because of climate change, we have begun researching drought- and submergence-tolerant seeds,” said Acharya.

These climate-smart varieties, which can survive under stress and retain desirable grain qualities, can create positive impacts on the lives of farmers, scientists say.

Since 1966, Nepal has released and registered 144 varieties of paddy seeds, according to the Agriculture Ministry.

Scientists say that a majority of these stress-tolerant varieties do not demand excess fertilisers or tillage methods.

The Nepal Agriculture Research Council (NARC) is spearheading various projects for producing and popularising drought- and submergence-tolerant seeds.

“Under USAID’s support, Nepal Seed and Fertiliser Project, paddy seeds which are drought and submergence tolerant are being produced and marketed in Nepal in partnership with the government and the private seed companies,” Issa said in an email.

The National Maize Research Programme of NARC has released heat stress-tolerant maize hybrids that can survive at high temperatures compared to traditional varieties.

Likewise, under the National Grain Legumes Research Programme of NARC, field testing of waterlogging-tolerant lentil varieties is being done to come up with varieties that can withstand excess moisture from unusual winter rains during the lentil growing season, according to Issa.

Despite the availability of stress-tolerant seeds, farmers are not much aware of the new varieties and are hesitant to adopt such seeds easily.

Due to lack of awareness, farmers hardly adopt new varieties and they prefer traditional varieties. Local governments too have failed to create awareness.

According to experts, Sukhaa Dhan 3, Samba Mansuli Sub-1 and Cherang Sub-1 are popular among farmers in the Tarai and mid-hills.

However, varieties like Bahuguni-2 have been rejected by farmers because “Nepali consumers prefer non-sticky, fluffy rice as opposed to sticky varieties,” experts say.

Despite being both drought and submergence tolerant, such varieties are not adopted by farmers.

“Farmers are enthusiastic about using new ways and techniques of farming, but local governments have completely ignored investing in agriculture,” said Ujjal Acharya, freelance researcher on climate change and environment economics.

“They have been more focused on building infrastructure, roads, bridges, temples and so on. Food security, climate resilient agriculture, organic farming—all do not fall within the priorities of local governments,” he said.

However, scientists acknowledge that climate resilient crop varieties are only a part of the solution of the bigger climate-resilient agricultural system.

“It is extremely important to develop climate-resilient crop varieties that can withstand extreme weather conditions, but seeds are just one part among the various solutions,” says Issa.

This piece by Aakriti Ghimire, was originally posted on The Kathmandu Post.

Women harvest wheat in India. (Photo: J. Cumes/CIMMYT)

Earlier wheat planting will boost yields in eastern India

Written by Sarah Fernandes on August 3, 2022. Posted in Blogs.

“For several years, we’ve been building dense data sets with colleagues from the Indian Agricultural Research Council, which have allowed us to unravel complex farm realities through big data analytics, and to determine what agricultural management practices really matter in smallholder systems,” said Andrew McDonald ’94, M.S. ’98, Ph.D. ’03, associate professor of soil and crop sciences in the College of Agriculture and Life Sciences. “This process has confirmed that planting dates are the foundation for climate resilience and productivity outcomes in the dominant rice-wheat cropping systems in the eastern sector in India.”

McDonald is first author of “Time Management Governs Climate Resilience and Productivity in the Coupled Rice-Wheat Cropping Systems of Eastern India,” published July 21 in Nature Food with a consortium of national and international partners, including scientists from the International Maize and Wheat Improvement Center (CIMMYT).

The research was conducted through the Cereal Systems Initiative for South Asia (CSISA). CSISA, which is led by CIMMYT with the International Rice Research Institute and the International Food Policy Research Institute as research partners, was established in 2009 to promote durable change at scale in South Asia’s cereal-based cropping systems.

Researchers found that farmers in eastern India could increase yield by planting wheat earlier – avoiding heat stress as the crop matures – and quantified the potential gains in yields and farm revenues for the region. They also found that the intervention would not negatively impact rice productivity, a key consideration for farmers. Rice alternates with wheat on the cropping calendar, with many farmers growing rice in the wet season and wheat in the dry season.

The study also provides new recommendations for rice sowing dates and types of cultivars, to accommodate the earlier sowing of wheat.

“Farmers are not just managing single crops. They are managing a sequence of decisions,” said McDonald, who has a joint appointment in the Department of Global Development. “Taking a cropping systems approach and understanding how things cascade and interlink informs our research approach and is reflected in the recommendations that emerged from this analysis. Climate resilient wheat starts with rice.”

The research is the result of years of collaboration with international groups and government agencies in India, which have identified the Eastern Ganges Plain as the area with the most potential growth in production. The region will become essential, McDonald said, as the demand for wheat grows, and climate change makes production more difficult and unpredictable; just this year, record heat waves in March and April and food shortages caused by the war in Ukraine – both of which prompted India’s government to instate a ban on wheat exports – have highlighted the need for increased yields and more sustainable farming practices.

“In the bigger sense, this research is timely because the hazards of climate change aren’t just a hypothetical,” McDonald said. “Many of these areas are stress-prone environments, and extreme weather already constrains productivity. Identifying pragmatic strategies that help farmers navigate current extremes will establish a sound foundation for adapting to progressive climate change.”

Poverty is endemic in the Eastern Ganges Plain, and the region is dominated by small landholders, with varying practices and access to resources. The breadth and specificity of the data collected and analyzed in the study – including field and household survey data, satellite data, and dynamic crop simulations – allowed researchers to understand regional small farms’ challenges and the barriers to change.

“At the end of the day, none of this matters unless farmers opt in,” McDonald said. “There’s a spatial dimension and a household dimension to opportunity. If we can target approaches accordingly, then we hope to position farmers to make management changes that will benefit the entire food system.”

The study was co-authored with researchers from the Australian Department of Primary Industries and Regional Development, the International Rice Research Institute, the International Maize and Wheat Improvement Center, the International Food Policy Research Institute, the Indian Council of Agricultural Research and Bihar Agricultural University. The research was supported by the Bill and Melinda Gates Foundation and the U.S. Agency for International Development through grants to the Cereal Systems Initiative for South Asia, which is led by the International Maize and Wheat Improvement Center.

This piece by Caitlin Hayes, was originally posted on the Cornell Chronicle website.

CIMMYT enumerators hold booklets with vignettes before their interaction with family farmers Kiran Devi (second from left) and Rishikesh Ram (third from left). (Photo: Nima Chodon /CIMMYT)

Researchers use storytelling to evaluate women’s agency in agricultural production

Written by Nima Chodon on July 12, 2022. Posted in News.

Researchers from the International Maize and Wheat Improvement Center (CIMMYT) are conducting a study in the state of Bihar, India, to improve our understanding of women’s and men’s contributions to decision-making around wheat crop management. The results will help reach women with new varieties that meet their needs and priorities.

The study seeks to overcome a big challenge for research organizations and national policymakers: to design a better framework for faster turnover of improved varieties and increased access to women and marginalized farmers.

Wheat is the second-largest crop grown in Bihar after rice, with a production of 5-6 million tonnes of it every year. Despite women’s contributions to farming activities, from sowing to harvesting, traditional gender norms can undermine their access to productive resources and influence household decisions. Additionally, women’s workload in wheat agriculture is increasing, due to men’s departure to non-agricultural jobs, but women are still not necessarily recognized as capable farmers.

Gender exclusion in agriculture

Given social norms and household-and-farm labor division based on gender, women are often confined to specific roles in the agricultural production system. In smallholder farming communities of South Asia like Bangladesh, India, and Nepal, men’s increasing involvement in non-agricultural activities has increased women’s workloads in every sphere of agricultural production. However, these long-held assumptions of their role can lead to exclusion from decision-making, limiting their control over what, how, and how much a crop is produced, their economic wellbeing, including household food security.

The CIMMYT study on “Intra-household gender dynamics in decision-making for wheat crop management in India (Bihar)” investigates women’s and men’s roles in production decisions. Led by Hom Gartaula, Gender, and Social Inclusion Specialist at CIMMYT, it covers eight villages — four in Darbhanga and four in Madhepura district — with 25 houses considered in each village.

As part of the Accelerating Genetic Gains in Maize and Wheat for improved livelihoods in Asia and Africa (AGG) project, the research study will help gain deeper insights into the intra-household gender dynamics. It will also help in untangling who does what, how wheat cultivation and management decisions are organized within the households and the perceptions of the male and female farmers around why decisions are made in such a way.

Farmer Devi points at the vignette that aligns with her household decision-making process. (Photo: Nima Chodon /CIMMYT)

Storytelling through household decision-making scenarios

In traditional rural societies, survey-based data collection might not be the best way to evaluate women’s agency, as the deeply rooted cultural restrictions might not allow them to talk openly about sensitive issues, like their relationship with a spouse. This study uses an innovative storytelling approach to data collection: using vignettes, farmers are given short stories to relate to their household circumstances. Stories are also easier to remember and help build a connection with the characters quickly.

The vignettes approach was first applied in the context of smallholder maize production in Kenya under the AGG project. According to Rachel Voss, the leader of the Kenyan study, “Using vignettes to explore decision-making in both East Africa and South Asia allows us to learn and compare across these regions and across crops. Gender relations in Indian wheat and Kenyan maize production might look similar in some ways, but very different in other ways, and our research and programming will need to respond to those differences.”

In this study, five vignettes with fictitious husband and wife characters are presented to participants to represent the different ways production and consumption decisions are made in the household. These vignettes describe how they engage in key decisions like seed procurement, labor hired, and harvest used for consumption or sale. With guidance from evaluators, respondents identify which scenario best aligns with the decision-making process in their household.

Researchers feel this qualitative data, gathered through a storytelling approach, could guide the reach of gender interventions in a more effective way. Gartaula and the team explained that the participants can build connections to a character in the story without biases, expressing their experiences in household decision-making through vignettes. They also observed that sometimes what the participant shared is the opposite of their assumption of women being excluded from decisions.

Rethinking gender roles

Traditional gender roles are deeply entrenched in the region. In the farming communities of rural Bihar, one might assume that who does what in wheat-rice cultivation is obvious, and it has been well studied in the past. However, investigating the stereotypes around gender to understand practices within households is an innovative aspect of this study.

For example, landless couple Pappu Paswan and Kamini Devi of village Kamtaul in Darbhanga district have been cultivating wheat on leased farm plots for many years. Devi is engaged in every aspect of decision-making. “We cultivate in leased plots of different sizes, spread across, requiring more effort and time in attending to them. We discuss additional labor during harvest and if there is money enough to pay them,” said Devi pointing her finger at the vignette illustrating ‘cooperation’ in household decision-making. They produce enough for their consumption, but when possible, “I advise my husband to sell some for income,” she added.

Despite contributing to decisions jointly with Pappu when it comes to farm labor and household finances, Devi has little or no knowledge of seed varieties and access. Her husband informs that it was UP262 (wheat seed variety) they have been cultivating for the last two years.

In Rishikesh Ram’s household, land ownership and livelihood specialization were factors in decision-making. He owns the land and makes all farming decisions, including how much will be saved for consumption at home. His wife, Kiran Devi, a nurse at the village primary health center, is hardly involved in any farming work. “As the income from her job contributes to expenses at home, decisions about loans or payment for labors on the farm are joint decisions,” Ram said.

“In these two households of the diverse decision-making process, different approaches to messaging and relevant extension services must be explored to address the issues of exclusion, access, and knowledge gaps in these households,” Gartaula observed.

Bridging the gender gap in agri-food systems

With the feminization of agriculture in the region, women’s contribution to agricultural production is likely to increase. Policy and research interventions must recognize this growing population and support their full economic and social contributions as cultivators, entrepreneurs, and laborers. However, whether women’s growing role in wheat production leads to increased decision-making authority and empowerment is still unknown. But hope is that AGG-supported gender research in South Asia and East Africa will help guide actions on gender and social inclusion in agri-food systems and support cross-learning between the regions.

Cereal seed value chains in Nepal

Written by Sarah Fernandes on July 7, 2022. Posted in Publications.

Cereals cover around 80% of Nepal’s cultivated land area, with a low level of productivity. The country’s commercial cereal seed sector development has been rather slow as more than 83% of seed comes from the informal system. The formal sector cannot produce adequate seeds to meet the farmers’ needs. Moreover, the formal market is largely driven by public seed varieties. To catalyze the sector’s development and enhance productivity, building a well-performing seed system that produces and timely supplies quality seeds at affordable rates to farmers is integral.

The adoption of a federal system of governance since 2018, creating new structures within the system, along with the after-effects of COVID-19 has impacted the public sector seed production and distribution with implications on private seed business. A recent assessment conducted by the International Maize and Wheat Improvement Center (CIMMYT) examines the current functions in the cereal value chain in Nepal and identifies upgrading strategies to bring efficiency and competitiveness in the cereal seed market systems, specifically for rice and maize.

An agrovet owner sells improved varieties of maize and rice locally produced by GATE Nepal Seed Company, a partner of CIMMYT in Banke, Nepal (Photo: Bandana Pradhan/CIMMYT)

The study provides a detailed analysis of the market size and trends for the various hybrid and open-pollinated varieties of rice and maize seeds as well as their production, distribution and margins in seed business.

A majority of rice and maize seeds, especially high-yielding hybrids, sold to farmers are brought in by importers and wholesalers who directly sells them to farmers or indirectly through agro-dealers. Nepali hybrid varieties are lagging because farmers, grain producers and millers have low awareness and information on new and improved varieties produced by local seed companies and cooperatives. A significant supply gap of rice and maize seeds was found in all the seven provinces of Nepal.

The study reviews the nature of inter-business relations in the seed value chain and provision of services by the government, NGOs and others for the development of the cereal seed value chain. In the context of federalism, the study assesses the seed policies and actions under the Revised Seed Act (2020) to establish provincial seed systems. Considering migration-induced feminization of agriculture in Nepal, the study identifies approaches to promote inclusive seed systems and youth engagement in seed value chains. Strategic measures to build a resilient seed system that can respond to abrupt market and mobility disruptions, as caused by the COVID-19 pandemic, is also taken into account. However, it also details out the various challenges and risks encountered by the value chain actors that hinders seed business and the sector’s growth overall.

CIMMYT designed seed packets of maize and rice to enhance branding and marketing of local products displayed in an agrovet in Banke district, Nepal (Photo: Bandana Pradhan/CIMMYT)

Some of the strategies to address these bottlenecks include strengthening value chain functions in research and development, hybrid seed production, seed processing and innovative approaches for market promotion and sales. Creating an enabling environment for seed companies in areas of variety testing and release, quality assurance in seed production and commercialization, financial and business management services, seed extension services and promotion of new domestic varieties are also fundamental propositions to achieve Nepal’s National Seed Vision (2013-2025) targets.

How does CIMMYT’s improved maize get to the farmer?

New CIMMYT maize hybrid available from the Latin America Breeding Program

Written by Sarah Fernandes on June 22, 2022. Posted in News.

CIMMYT is proud to announce a new improved subtropical maize hybrid that is now available for uptake by public and private sector partners, especially those interested in marketing or disseminating hybrid maize seed across mid-altitudes of Mexico and similar agro-ecologies. National agricultural research systems (NARS) and seed companies are invited to apply for a license to commercialize this new hybrid to bring the benefits of the improved seed to farming communities.

The deadline to submit applications is 15 August 2022. Applications received after that date will be considered during the following round of product allocations.

The newly available CIMMYT maize hybrid, CIM20LAPP2B-2, was identified through rigorous trialing and a stage-gate advancement process that culminated in the 2020 Stage 5 trials for CIMMYT’s Latin American tropical mid-altitude maize breeding pipeline (LA-PP2B). While individual products will vary, the LA-PP2B pipeline aims to develop maize hybrids fitting the product profile described in the following table:

Product Profile	*Basic traits*	*Nice-to-have / Emerging traits*
Latin America Product Profile 2B (LA-PP2B)	Intermediate-maturing, yellow kernel, high-yielding, drought tolerant, resistant to FSR, GLS, and ear rots	TSC, TLB

Information about the newly available CIMMYT maize hybrid from the Latin America breeding program, application instructions, and other relevant material is available in the CIMMYT Maize Product Catalog and the links provided below.

Use the following link to access the full CIMMYT Stage 4 and Stage 5 Trials in Mexico: Results of the 2019 and 2020 Trials and Product Announcement, including the trial performance summary data and trial location data.

Applications must be accompanied by a proposed commercialization plan for each product being requested. Applications may be submitted online via the CIMMYT Maize Licensing Portal and will be reviewed in accordance with CIMMYT’s Principles and Procedures for Acquisition and use of CIMMYT maize hybrids and OPVs for commercialization. Specific questions or issues faced with regard to the application process may be addressed to GMP-CIMMYT@cgiar.org with attention to Nicholas Davis, Program Manager, Global Maize Program, CIMMYT.

APPLY FOR A LICENSE

A women farmer picking up lodged paddy field after the untimely flash floods in Nepal (Photo: Sravan Shrestha/ICIMOD)

Managing seeds and agricultural losses in the wake of extreme climate events: Lessons from Nepal

Written by Sarah Fernandes on June 21, 2022. Posted in Blogs.

As climate change-induced disasters surge around the world, it is the people of the least developed countries paying the bulk of the costs. According to the International Disaster Database, the number of disasters across the globe has risen by 74.5% — comparing data from 1980–1999 with 2000–2019 — and these numbers are expected to increase due to the most recent climate change scenarios. The major climate change impacts identified by the Intergovernmental Panel on Climate Change relevant for Nepal include an increase in economic losses from weather and climate-related events, with a significant contribution related to agricultural losses.

In Nepal, for example, an unexpected and untimely excessive rainfall and flood in October of 2021 caused massive damage to the ready-to-harvest crop across all major rice-producing areas of Nepal – threatening the food security and livelihood of the country’s smallholder rice farmers.

A rice damage assessment was essential to gather insights on the seed production losses and propose anticipatory measures for seed management and distribution to farmers for the next season. Thanks to a collaboration between scientists from the International Maize and Wheat Improvement Center (CIMMYT) and the International Center for Integrated Mountain Development (ICIMOD), a rapid loss assessment through a survey of rice-growing farmers was conducted to quickly assess the damage and recommend critical operational decisions to the Nepali government to mitigate the impact. With the help of an operational mobile app, Geofairy, the USAID-supported Nepal Seed and Fertilizer project (NSAF), implemented by CIMMYT, surveyed 253 farmers in six districts of the mid and far western region with a particular focus on the potential seed production losses for next year’s cultivation.

Unforeseen disaster

The 2021 disaster in Nepal came as a shock to farmers: the 2021 monsoon was proceeding as forecasted in the seasonal outlook, and by the end of the season, farmers were generally expecting bumper rice crops. The withdrawal of southwest monsoon system was declared in early October. However, from 18-20 October 2021, instead of dry spell, the country experienced a three-day excessive rainfall and accompanying flooding that caused massive damage to the ready-to-harvest crop across all major rice-producing areas in the southern lowland Terai region of Nepal.

The partially harvested and standing crop suffered three kinds of damage. First, farmers near the riverbanks lost their ready-to-harvest paddy as it was swept away by flash floods. The second category was in the low-lying southern plains, where rainwater inundated the harvested, but not collected, paddy fields for more than two days, causing seeds or grains on the panicles to sprout. Sprouted seeds on the mother plant have reduced germination capacity and vigor, and cannot be stored for a long period while maintaining the germination capacity. The third damage was stem and root lodging (falling over) due to powerful winds.

Digital technologies for rapid damage assessment

With conventional approaches, on-ground damage assessments after a disaster can take weeks, sometimes months, limiting critical operational decisions in the first few hours and days. However, Nepal’s Ministry of Agriculture and Livestock Development (MoALD) was already prepared: since 2019, the Ministry has been using satellite remote sensing for in-season rice area estimation through the USAID-supported SERVIR HKH program.

Thanks to the platform, experts from ICIMOD were able to share a satellite image-based assessment as early as 22 October 2021: two days after the flood.

This existing digital crop monitoring platform was used to produce a rapid-damage assessment to provide an analytical basis for initial decisions. In the rapid damage assessment, GMP IMERGE satellite data was used to measure the rainfall intensity across Nepal (Figure 1) and Selntinel-1 SAR satellite data was used to map flood water extent in the Terai district of Nepal on 21 October 2022. The assessment also served as a planning tool for in-depth damage evaluation for farmer compensations.

Widespread flooding

Figure 1. Rainfall distribution during 18-20 October 2021 based on the GPM IMERGE satellite precipitation data

Satellite precipitation data showed the occurrence of hefty rainfall in Morang, Sunsari, Saptari, Siraha and Jhapa districts in the Eastern region. In the Western region, Kailali and Kanchanpur experienced intense rainfall, while most of the central districts of the Terai region remained below heavy rain.

Based on satellite images acquired, the flood extent assessment showed major flood spread in the western parts, including Kanchanpur, Kailali, Bardiya and Banke districts (Figure 2). The flood water extent remained lower in the Eastern districts compared to the West. The causes of severe damage were from direct rain pour and winds in the Eastern region, and flood swept from riverbanks in the Western parts.

Figure 2. Flood extent on 21 October 2021 in Kanchanpur district based on the Sentinel-1 satellite data

Assessment results: Reduced seed quality and shortage of rice seed supply for the next planting season

According to a field-based assessment, the two most popular varieties, Radha-4 and Sarju-52, are the most affected by the flood, especially in Banke, Bardiya, Kailali and Kanchanpur districts. Accordingly, 89% of Radha-4 and 42% of Sarju-52 seed production field has faced partial or complete loss in the surveyed districts. As per the district-wise loss assessment, 80% of Sirju-52 grown in Kailali and 61% in Kanchanpur suffered 50-100% damage. Similarly, nearly 60% of Radha-4 grown in Banke and Bardiya districts has suffered a crop loss ranging from 50-100%. This clearly indicates a huge shortage of these varieties for the next rice season which calls for immediate action to mitigate the seed deficit.

The survey found that farmers in Bardiya, Banke and Kailali had severe or complete crop loss, while those in Kanchanpur, Kapilvastu and Rupendehi had partial crop failure (Figure. 3)

Figure 3. Level of rice loss (%) due to flood, based on a rapid crop loss assessment in six districts of Nepal

Losses and the limits of early warning systems

According to the government’s final estimates, about 1,10,000 ha of rice crop area was damaged across the country. Respondents from the western districts reported that 80% of the farmers could only manage 50% or less than the expected harvest. The farmers reported an average input cost of $526 per hectare (NPR 63,162 per ha) and gross expected income of $972 per hectare (NPR 116,674 per ha) – leaving a very narrow margin of profit. To compensate for this economic blow, the government distributed $43 million (NPR 5.52 billion) among the farmers. However, with a total loss of $0.1 billion (NPR 12 billion), farmers still suffered a great loss.

Figure 4. Percentage of safe harvest in four western districts (Kapilvastu, Rupandehi, Kanchanpur and Bardiya) of Nepal

Although early warning systems were in place in the surveyed districts, some respondents expressed low trust and reliability in the early warnings and only 20% of respondents were aware of the heavy rainfall forecast issued three days before the extreme event. Earlier studies in the Ganges basin have suggested that a 10–20-day lead-time forecast is needed to avoid agriculture losses. However, predicting a high magnitude of low-frequency extreme events with sufficient advance notice is still a significant challenge in climate science.

How to mitigate and weather such challenges?

Nepal’s rice seed replacement rate is around 20%, which means that about 80% of farmers are not accessing good quality seeds every season. The addition of this untimely flash flood and the subsequent seed loss will further worsen seed availability, in turn contributing to food insecurity at the national level. The assessment findings have several implications for actions needed to mitigate future climate shocks.

Among other mitigation approaches, stakeholders need to assess in-country level quality rice seed availability and design a plan to mobilize preferred varieties from the surplus districts — less affected by the flood — to those in need.
During challenging times, maintaining seed quality standards might be difficult. Hence, stakeholders need to consider adopting a flexible quality standard such as “quality declared seeds” in similar emergency scenarios. The “quality declared seed” standard helps as an important intervention when normal seed production is greatly affected by drought and/or flood. It offers alternative seed quality standards for seed producers to provide seeds and ensure continuity of crop production.
Promoting climate-resilient varieties, especially lodging- or submergence-tolerant rice varieties, will better withstand flooding as compared to the susceptible ones.
Furthermore, farmers need access to a suitable crop insurance scheme to offset seed losses during extreme weather events. For instance, seed growers can purchase a group insurance scheme where customized premiums could be available to the members.

Some of the above mitigation approaches can be applied when extreme weather events are well forecasted and less severe. However, in the wake of an emerging climate crisis and limited mitigation options, there is a need to balance efforts on all aspects of adaptation, including the adoption of crop management practices including accelerated varietal turnover to modify threats and prevent adverse impacts, strengthen early warning systems with a focus on last-mile connection to minimize damages, and develop innovative mechanisms to address risk transfer and loss and damage compensations for sharing losses.

Pilot farm in Yangambi, Democratic Republic of Congo. (Photo: Axel Fassio/CIFOR)

Getting to win-win: Can people and nature flourish on an increasingly cultivated planet?

Written by Steven M on June 15, 2022. Posted in Features.

Our planet is facing a massive biodiversity crisis. Deeply entwined with our concurrent climate crisis, this crisis may well constitute the sixth mass extinction in Earth’s history. Increasing agricultural production, whether by intensification of extensification, is a major driver of biodiversity loss. Beyond humanity’s moral obligation to not drive other species to extinction, biodiversity loss is also associated with the erosion of critical processes that maintain the Earth system in the only state that can support life as we know it. It is also associated with the emergence of novel, zoonotic pathogens like the SARS-CoV-2 virus that is responsible for the current COVID-19 global pandemic.

Conservation ecologists have proposed two solutions to this challenge: sparing or sharing land. The former implies practicing a highly intensive form of agriculture on a smaller land area, thereby “sparing” a greater proportion of land for biodiversity. The latter implies a multifunctional approach that boosts the density of wild flora and fauna on agricultural land. Both have their weaknesses though: sparing often leads to agrochemical pollution of adjacent ecosystems, while sharing implies using more land for any production target.

In an article in Biological Conservation, agricultural scientists at the International Maize and Wheat Improvement Center (CIMMYT), argue that, while both land sharing and sparing are part of the solution, the current debate is too focused on trade-offs and tends to use crop yield as the sole metric of agricultural performance. By overlooking potential synergies between agriculture and biodiversity and ignoring metrics that may matter more to farmers than yield —for example, income, labor productivity, or resilience — the authors argue that the two approaches have had limited impact on the adoption by farmers of practices with proven benefits on both biodiversity and agricultural production.

Beyond the zero-sum game

At the heart of the debate around land sparing versus land sharing is a common assumption: there is a zero-sum relationship between wild species density and agricultural productivity per unit of land. Hence, the answer to the challenge of balancing biodiversity conservation with feeding a growing human population appears to entail some unpalatable trade-offs, no matter which side of the debate you side with. As the debate has largely been driven by conservation ecologists, proposed solutions often approach conserving biodiversity in ways that offer limited benefits, and often losses, to farmers.

On the land sparing side, the vision is to carve up rural landscapes almost as a planner would zone urban space: some areas would be zoned for highly intensive forms of agricultural production, largely devoid of wild species, while others would be zoned as biodiversity-rich areas. As the authors point out, however, such a strictly segregated view of land use is challenged by the natural migratory patterns of species, their need for diverse types of ecosystems over the course of the seasons or their lifecycles, and the high risk of pollution associated with intensive agriculture, such as run-off and leaching of agrochemicals, and pesticide drift.

Proponents of the land sharing view argue for a multifunctional approach to agricultural production that introduces a greater density of wild species onto agricultural land, thus integrating production and conservation into the same land units. This, however, inevitably diminishes agricultural productivity, as measured by yield.

This view, the article argues, overlooks the synergies between agriculture and biodiversity. Not only can biodiversity support agriculture through ecosystem services, but farmlands also support many species. For example, the patchiness created in the landscape by swidden agriculture or by grazing livestock supports more biodiversity than closed-canopy ecosystems, benefiting open-habitat species in particular. And except for rare forms of “controlled environment agriculture” such as hydroponics, all agricultural systems depend on the ecosystem services rendered by a multitude of organisms, from soil fertility maintenance to pollination and pest control.

Tzeltal farmers in Chiapas, Mexico. (Photo: Peter Lowe for CIMMYT)

“Agriculture is about flexibility and pragmatism,” said Frédéric Baudron, a system agronomist at CIMMYT and the lead author of the study. “Farmers need to be presented with a wider basket of solutions than the dichotomy of high-yielding and polluting agriculture versus low-input and low-yielding agriculture offered by land sharing/sparing. Virtually all production systems require both external inputs and ecosystem services. In addition, agricultural scientists have developed a variety of solutions, such as precision agriculture, to minimize the risk of pollution when using external inputs, and push-pull technology to harness ecosystem services for tangible productivity gains.

Similarly, an exclusive focus on yield as a measure of agricultural performance obscures ways in which greater biodiversity on agricultural land can support farmers’ livelihoods and economic wellbeing. The authors show, for example, that simplified landscapes in southern Ethiopia tend to have higher crop productivity. But more diverse landscape in the same area, while hosting more biodiversity, produce more fuelwood, support a higher livestock productivity, provide a greater dietary diversity, and are more resilient to environmental stresses and external economic shocks, all of which being highly valued by local people.

Imagining landscapes where biodiversity and people win

The land sharing versus sparing debate deserves enormous credit for bringing attention to the role of agriculture in biodiversity loss and for pushing the scientific community and policymakers to address the problem and think about how to balance agriculture and conservation. As the authors of this paper show, as researchers from a more diverse range of scientific disciplines join the debate, there is tremendous potential to move the conversation from a vision that pits agriculture against biodiversity and towards solutions that highlight the potential synergies between these activities.

“It is our hope that this paper will stimulate other agricultural scientists to contribute to the debate on how to feed a growing population while safeguarding biodiversity. This is possibly one of the biggest challenges of our rapidly changing agri-food systems. But we have the technologies and the analytics to face this challenge,” Baudron said.

Cover photo: Pilot farm in Yangambi, Democratic Republic of Congo. (Photo: Axel Fassio/CIFOR)

The race against time to breed a wheat to survive the climate crisis

Written by Rodrigo Ordóñez on June 12, 2022. Posted in In the media.

CIMMYT scientists are using biodiversity, testing forgotten wheat varieties from across the world, to find those with heat- and drought-tolerant traits. The aim is to outpace human-made global heating and breed climate-resilient varieties so yields do not collapse, as worst-case scenarios predict.

Reporter Nina Lakhani visited CIMMYT’s experimental station in Ciudad Obregon, in Mexico’s Sonora state, and witnessed CIMMYT’s unique role in fighting climate change through the development of resilient varieties as “international public goods”.

A shortage of farm workers is driving the serious consideration by farmers and policymakers to replace traditional, labor-intensive puddled rice cropping (shown here), which leads to sizable methane emissions and profligate use of irrigation water, with the practice of growing rice in non-flooded soils, using conservation agriculture and drip irrigation practices. (Photo: P. Wall/CIMMYT)

A climate-smart remodeling of South Asia’s rice-wheat cropping is urgent

Written by Mike Listman on June 3, 2022. Posted in Publications.

A climate change hotspot region that features both small-scale and intensive farming, South Asia epitomizes the crushing pressure on land and water resources from global agriculture to feed a populous, warming world. Continuous irrigated rice and wheat cropping across northern India, for example, is depleting and degrading soils, draining a major aquifer, and producing a steady draft of greenhouse gases.

Through decades-long Asian and global partnerships, the International Maize and Wheat Improvement Center (CIMMYT) has helped to study and promote resource-conserving, climate-smart solutions for South Asian agriculture. Innovations include more precise and efficient use of water and fertilizer, as well as conservation agriculture, which blends reduced or zero-tillage, use of crop residues or mulches as soil covers, and more diverse intercrops and rotations. Partners are recently exploring regenerative agriculture approaches — a suite of integrated farming and grazing practices to rebuild the organic matter and biodiversity of soils.

Along with their environmental benefits, these practices can significantly reduce farm expenses and maintain or boost crop yields. Their widespread adoption depends in part on enlightened policies and dedicated promotion and testing that directly involves farmers. We highlight below promising findings and policy directions from a collection of recent scientific studies by CIMMYT and partners.

Getting down in the dirt

A recent scientific review examines the potential of a suite of improved practices — reduced or zero-tillage with residue management, use of organic manure, the balanced and integrated application of plant nutrients, land levelling, and precise water and pest control — to capture and hold carbon in soils on smallholder farms in South Asia. Results show a potential 36% increase in organic carbon in upper soil layers, amounting to some 18 tons of carbon per hectare of land and, across crops and environments, potentially cutting methane emissions by 12%. Policies and programs are needed to encourage farmers to adopt such practices.

Another study on soil quality in India’s extensive breadbasket region found that conservation agriculture practices raised per-hectare wheat yields by nearly half a ton and soil quality indexes nearly a third, over those for conventional practices, as well as reducing greenhouse gas emissions by more than 60%.

Ten years of research in the Indo-Gangetic Plains involving rice-wheat-mungbean or maize-wheat-mungbean rotations with flooded versus subsoil drip irrigation showed an absence of earthworms — major contributors to soil health — in soils under farmers’ typical practices. However, large earthworm populations were present and active under climate-smart practices, leading to improved soil carbon sequestration, soil quality, and the availability of nutrients for plants.

The field of farmer Ram Shubagh Chaudhary, Pokhar Binda village, Maharajganj district, Uttar Pradesh, India, who has been testing zero tillage to sow wheat directly into the unplowed paddies and leaving crop residues, after rice harvest. Chaudhary is one of many farmer-partners in the Cereal Systems Initiative for South Asia (CSISA), led by CIMMYT. (Photo: P. Kosina/CIMMYT)

Rebooting marginal farms by design

Using the FarmDESIGN model to assess the realities of small-scale, marginal farmers in northwestern India (about 67% of the population) and redesign their current practices to boost farm profits, soil organic matter, and nutritional yields while reducing pesticide use, an international team of agricultural scientists demonstrated that integrating innovative cropping systems could help to improve farm performance and household livelihoods.

More than 19 gigatons of groundwater is extracted each year in northern India, much of this to flood the region’s puddled, transplanted rice crops. A recent experiment calibrated and validated the HYDRUS-2D model to simulate water dynamics for puddled rice and for rice sown in non-flooded soil using zero-tillage and watered with sub-surface drip irrigation. It was found that the yield of rice grown using the conservation agriculture practices and sub-surface drip irrigation was comparable to that of puddled, transplanted rice but required only half the irrigation water. Sub-surface drip irrigation also curtailed water losses from evapotranspiration and deep drainage, meaning this innovation coupled with conservation agriculture offers an ecologically viable alternative for sustainable rice production.

Given that yield gains through use of conservation agriculture in northern India are widespread but generally low, a nine-year study of rice-wheat cropping in the eastern Indo-Gangetic Plains applying the Environmental Policy Climate (EPIC) model, in this case combining data from long-term experiments with regionally gridded crop modeling, documented the need to tailor conservation agriculture flexibly to local circumstances, while building farmers’ capacity to test and adapt suitable conservation agriculture practices. The study found that rice-wheat productivity could increase as much as 38% under conservation agriculture, with optimal management.

Key partner organizations in this research include the following: Indian Council of Agricultural Research (ICAR); Central Soil Salinity Research Institute (CSSRI), Indian Agricultural Research Institute (IARI), Indian Institute of Farming Systems Research (IIFSR), Agriculture University, Kota; CCS Haryana Agricultural University, Hisar; Punjab Agricultural University, Ludhiana; Sri Karan Narendra Agriculture University, Jobner, Rajasthan; the Borlaug Institute for South Asia (BISA); the Trust for Advancement of Agricultural Sciences, Cornell University; Damanhour University, Damanhour, Egypt; UM6P, Ben Guerir, Morocco; the University of Aberdeen; the University of California, Davis; Wageningen University & Research; and IFDC.

Generous funding for the work cited comes from the Bill & Melinda Gates Foundation, The CGIAR Research Programs on Wheat Agri-Food Systems (WHEAT) and Climate Change, Agriculture and Food Security (CCAFS), supported by CGIAR Fund Donors and through bilateral funding agreements), The Indian Council of Agricultural Research (ICAR), and USAID.

Cover photo: A shortage of farm workers is driving the serious consideration by farmers and policymakers to replace traditional, labor-intensive puddled rice cropping (shown here), which leads to sizable methane emissions and profligate use of irrigation water, with the practice of growing rice in non-flooded soils, using conservation agriculture and drip irrigation practices. (Photo: P. Wall/CIMMYT)

Scaling Out Small Mechanization in the Ethiopian Highlands

Written by Rodrigo Ordóñez on June 2, 2022. Posted in Uncategorized.

The project goal is to provide smallholder farmers with appropriate mechanization technologies that reduce drudgery during farm operations.

The objectives of the project are:

To promote small-scale mechanization through awareness and demand creation, and service provision of appropriate technologies
To create employment along the mechanization value chain.

The project sites are located in Amhara, Oromia, SNNP (Southern Nations, Nationalities and Peoples) and Tigray regions of Ethiopia.

The target beneficiaries of the project include smallholder farmers who use traditional methods of farming, the youth who can be employed in service provision activities along the mechanization value chain, service providers, and private sector companies involved in equipment manufacturing and importing.

Through the project, smallholder farmers access planting, harvesting, post-harvest processing (threshing and shelling), irrigation and transport services from service providers located in their communities. The project operates under the Africa-RISING program led by ILRI in Ethiopia.

Rapid Point-of-Care Diagnostics for Wheat Rusts (MARPLE)

Written by Bea Ciordia on May 30, 2022. Posted in Uncategorized.

MARPLE (Mobile And Real-time PLant disEase) diagnostics is a new innovative approach for fungal crop pathogen diagnostics developed by Diane Saunders’s team at the John Innes Centre.

MARPLE is the first operational system in the world using nanopore sequencing for rapid diagnostics and surveillance of complex fungal pathogens in situ. Generating results in 48 hours of field sampling, this new digital diagnostic strategy is leading revolutionary changes in plant disease diagnostics. Rapid strain level diagnostics are essential to quickly find new emergent strains and guide appropriate control measures.

Through this project, CIMMYT will:

Deploy and scale MARPLE to priority geographies and diseases as part of the Current and Emerging Threats to Crops Innovation Lab led by Penn State University / PlantVillage and funded by USAID’s Feed the Future.
Build national partner capacity for advanced disease diagnostics. We will focus geographically on Ethiopia, Kenya and Nepal for deployment of wheat stripe and stem rust diagnostics, with possible expansion to Bangladesh and Zambia (wheat blast).
Integrate this new in-country diagnostic capacity with recently developed disease forecasting models and early warning systems. Already functional for wheat stripe rust, the project plans to expand MARPLE to incorporate wheat stem rust and wheat blast.

Bangladesh Integrated Pest Management Activity (IPMA)

Written by Bea Ciordia on May 30, 2022. Posted in Uncategorized.

The Bangladesh Integrated Pest Management Activity (IPMA) project aims to strengthen the capacity of agricultural stakeholders in Bangladesh by controlling and preventing the spread of current and emerging threats to ensure more efficient, profitable, and environmentally safe agricultural production and productivity.

Objectives

Increase the availability and affordability of integrated pest management measures for the prevention and spread of current and emerging threats
Strengthen the capacity of Bangladesh agricultural stakeholders, such as academia, financial institutions, government, judiciary, media, civil society, the private sector, and value chain actors, to implement integrated pest management measures
Enhance the adoption of integrated pest management by smallholder farmers to increase agricultural production and productivity, while reducing environmental hazards caused by indiscriminate use of pesticides

Bipolaris sorokiniana, the fungus causing spot blotch in wheat. (Photo: Xinyao He and Pawan Singh/CIMMYT)

Two approaches better than one: identifying spot blotch resistance in wheat varieties

Written by Sarah Fernandes on May 30, 2022. Posted in Publications.

Spot blotch, a major biotic stress challenging bread wheat production is caused by the fungus Bipolaris sorokiniana. In a new study, scientists from the International Maize and Wheat Improvement Center (CIMMYT) evaluate genomic and index-based selection to select for spot blotch resistance quickly and accurately in wheat lines. The former approach facilitates selecting for spot blotch resistance, and the latter for spot blotch resistance, heading and plant height.

Genomic selection

The authors leveraged genotyping data and extensive spot blotch phenotyping data from Mexico and collaborating partners in Bangladesh and India to evaluate genomic selection, which is a promising genomic breeding strategy for spot blotch resistance. Using genomic selection for selecting lines that have not been phenotyped can reduce the breeding cycle time and cost, increase the selection intensity, and subsequently increase the rate of genetic gain.

Two scenarios were tested for predicting spot blotch: fixed effects model (less than 100 molecular markers associated with spot blotch) and genomic prediction (over 7,000 markers across the wheat genome). The clear winner was genomic prediction which was on average 177.6% more accurate than the fixed effects model, as spot blotch resistance in advanced CIMMYT wheat breeding lines is controlled by many genes of small effects.

“This finding applies to other spot blotch resistant loci too, as very few of them have shown big effects, and the advantage of genomic prediction over the fixed effects model is tremendous”, confirmed Xinyao He, Wheat Pathologist and Geneticist at CIMMYT.

The authors have also evaluated genomic prediction in different populations, including breeding lines and sister lines that share one or two parents.

Spot blotch susceptible wheat lines (left) and resistant lines. (Photo: Xinyao He and Pawan Singh/CIMMYT)

Index selection

One of the key problems faced by wheat breeders in selecting for spot blotch resistance is identifying lines that are genetically resistant to spot blotch versus those that escape and exhibit less disease by being late and tall. “The latter, unfortunately, is often the case in South Asia”, explained Pawan Singh, Head of Wheat Pathology at CIMMYT.

A potential solution to this problem is the use of selection indices that can make it easier for breeders to select individuals based on their ranking or predicted net genetic merit for multiple traits. Hence, this study reports the first successful evaluation of the linear phenotypic selection index and Eigen selection index method to simultaneously select for spot blotch resistance using the phenotype and genomic-estimated breeding values, heading and height.

This study demonstrates the prospects of integrating genomic selection and index-based selection with field based phenotypic selection for resistance in spot blotch in breeding programs.

Read the full study:
Genomic selection for spot blotch in bread wheat breeding panels, full-sibs and half-sibs and index-based selection for spot blotch, heading and plant height

Cover photo: Bipolaris sorokiniana, the fungus causing spot blotch in wheat. (Photo: Xinyao He and Pawan Singh/CIMMYT)

Researchers evaluate wheat for spot blotch at CIMMYT’s experimental station in Agua Fría, Jiutepec, Morelos state, Mexico. (Photo: Xinyao He and Pawan Singh/CIMMYT)

CIMMYT scientists identify novel genomic regions associated with spot blotch resistance

Written by Sarah Fernandes on May 23, 2022. Posted in Publications.

Spot blotch, caused by the fungus Biopolaris sorokiniana poses a serious threat to bread wheat production in warm and humid wheat-growing regions globally, affecting more than 25 million hectares and resulting in huge yield losses.

Chemical control approaches, including seed treatment and fungicides, have provided acceptable spot blotch control. However, their use is unaffordable to resource-poor farmers and poses a hazard to health and the environment. In addition, “abiotic stresses like heat and drought that are widely prevalent in South Asia compound the problem, making varietal genetic resistance the last resort of farmers to combat this disease,” according to Pawan Singh, Head of Wheat Pathology at the International Maize and Wheat Improvement Center (CIMMYT). Therefore, one of CIMMYT’s wheat research focus areas is developing wheat varieties that carry genetic resistance to the disease.

Signs of spot blotch on wheat. (Photo: Philomin Juliana/CIMMYT)

Previously, only four spot blotch resistance genes in bread wheat had been identified. Through a new study, CIMMYT scientists have identified novel genomic regions associated with spot blotch resistance using the genome-wide association mapping approach with 6,736 advanced breeding lines from different years (2013 to 2020), evaluated at CIMMYT’s spot blotch screening platform in Agua Fría, in Mexico’s state of Morelos.

The study’s results are positive and confirmed that:

Many advanced CIMMYT breeding lines have moderate to high resistance to spot blotch.
Resistance to the disease is conferred quantitatively by several minor genomic regions that act together in an additive manner to confer resistance.
There is an association of the 2NS translocation from the wild species Aegilops ventricosa with spot blotch resistance.
There is also an association of the spot blotch favorable alleles at the 2NS translocation, and two markers on the telomeric end of chromosome 3BS with grain yield evaluated in multiple environments, implying that selection for favorable alleles at these markers could help obtain higher grain yield and spot blotch resistance.

“Considering the persistent threat of spot blotch to resource-poor farmers in South Asia, further research and breeding efforts to improve genetic resistance to the disease, identify novel sources of resistance by screening different germplasm, and selecting for genomic regions with minor effects using selection tools like genomic selection is essential,” explained Philomin Juliana, Molecular Breeder and Quantitative Geneticist at CIMMYT.

Read the full study:
Genome-Wide Association Mapping Indicates Quantitative Genetic Control of Spot Blotch Resistance in Bread Wheat and the Favorable Effects of Some Spot Blotch Loci on Grain Yield

Cover photo: Researchers evaluate wheat for spot blotch at CIMMYT’s experimental station in Agua Fría, Jiutepec, Morelos state, Mexico. (Photo: Xinyao He and Pawan Singh/CIMMYT)