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Smallholder Mexican farmers adopt resource-conserving innovations: slowly and in bits

Written by Mike Listman on August 25, 2023. Posted in Blogs.

Small-scale farmers in Mexico often adopt conservation agriculture innovations gradually and piecemeal, to fit their diverse agroecological and socioeconomic contexts and risk appetites, according to studies and the on-farm experience of CIMMYT.

Research and extension efforts need to consider this in work with smallholders, said Santiago Lopez-Ridaura, a CIMMYT specialist in agricultural systems and climate change adaptation.

“Farmer practices typically involve heavy tillage before seeding, growing maize as a monocrop, and removing crop residues after harvest for use as forage,” explained Lopez-Ridaura. “Full-on conservation agriculture (CA) is a radical shift, requiring farmers to reduce or eliminate tillage, keep a permanent cover of crop residues on the soil, and diversify the crops they grow. It can support more intense yet environmentally friendly farming, reducing erosion, improving soil fertility and water filtration, boosting crop yields, and saving farmers money. However, it also requires purchasing or contracting specialized sowing implements and fencing fields or agreeing with neighbors to keep livestock from eating all the residues, to name just a few changes.”

Conserving crop residues favors production systems and provides various benefits. (Photo: Simon Fonteyne/CIMMYT)

Lopez-Ridaura and colleagues published a 2021 analysis involving farmers who grew maize and sorghum and keep a few livestock on small landholdings (less than 4 hectares), with limited mechanization and irrigation, in the state of Guanajuato, Central Mexico.

They found that scenarios involving hybrid maize plus a legume crop with zero-tillage or keeping a residue mulch on the soil provided an average net profit of some US $1,600 (MXP 29,000) per year, in addition to ecological benefits, added forage, and more stable output under climate stress.

“Using a modeling framework from Australia’s Commonwealth Scientific and Industrial Research Organization (CSIRO) that combines bioeconomic simulation, risk analysis, adoption theory, and impact assessment, we not only confirmed the worth of conservation agriculture but found that disaggregating CA into smaller component packages and including a more productive crop and variety were likely to increase farmers’ adoption, in riskier settings.”

Advancing more sustainable farming in Mexico

Conservation agriculture can generate substantial economic and environmental benefits under marginal conditions, particularly by enhancing climate change resilience, increasing soil organic matter, and retaining soil moisture. In Central Mexico dryland maize yields rose by 38-48%, after 10 years of implementing CA.

CIMMYT’s multi-crop, multi-use zero tillage seeder at work on a long-term conservation agriculture (CA) trial plot, left, at the center’s headquarters at El Batán, Mexico. (Photo credit: CIMMYT)

CIMMYT has studied and promoted zero-tillage for maize and other resource-conserving practices in Mexico for more than three decades, but efforts to spread sustainable farming and use of improved maize and wheat varieties redoubled thanks to MasAgro, a research initiative led by the Center and supported by the government of Mexico during 2010-21. Testimonials such abound of Mexican smallholder farmers who have adopted and benefited from CA practices through CIMMYT and national partners’ efforts in MasAgro and other initiatives.

Looking to lower his farm costs without losing output, wheat and oil crop farmer Alfonso Romo of Valle de Mayo, state of Sonora, began practicing CA in 2010. “We’ve learned a lot and this year (2022) we obtained the same yields as we used to get through conventional practices but, following more sustainable farming methods, with a 30 and even 40% savings in fertilizer.”
With CA practices he adopted in 2018 through MasAgro, maize farmer Rafael Jacobo of Salvatierra, state of Guanajuato, obtained a good crop despite the late dispersal of irrigation water. Seeing his success and that of other nearby farmers, neighbor Jorge Luis Rosillo began using CA techniques and has noticed yearly improvements in his soil and yields. “I did everything the technicians recommended: keeping the residues on the soil and renewing only the sowing line on soil beds…. There are lots of advantages but above all the (cost) savings in land preparation.”

The Milpa Sustentable project in the Yucatan Peninsula is recognized by the UN as a world example of sustainable development. (Photo: CIMMYT)

Farmers in the Milpa Sustentable project in the Yucatán Peninsula have improved maize yields using locally adapted CA methods, in collaboration with the Autonomous University of Yucatán. Former project participant Viridiana Sei said she particularly liked the respectful knowledge sharing between farmers and project technicians.
CA practices have allowed more than 320 women farmers in the Mixteca Region of the state of Oaxaca to provide more and better forage for the farm animals they depend on, despite drought conditions, through the Crop and Livestock Conservation Agriculture (CLCA) project supported by the International Fund for Agricultural Development (IFAD). According to farmer María Martínez Cruz, “… it hasn’t rained much and everything’s dry, but our verdant oat crop is allowing us to keep our farm animals fed.”
With CLCA support and facing Mexico’s increasingly fickle rainy season, farmer Mario Guzmán Manuel of San Francisco Chindúa village in Oaxaca began using CA and says he’ll never go back to the old practices. “We used to do as many as two harrow plowings to break up the soil, but if we leave the residues from the previous crop, they hold in the soil moisture more effectively. People hang onto the old ways, preferring to burn crop residues, but we should understand that this practice only deprives the soil of its capacity to produce.”

A farmer in the Ara district, in India's Bihar state, applies NPK fertilizer, composed primarily of nitrogen, phosphorus and potassium. (Photo: Dakshinamurthy Vedachalam/CIMMYT)

Biological nitrogen fixation and prospects for ecological intensification in cereal-based cropping systems

Written by Sarah McLaughlin on August 23, 2022. Posted in Publications.

Among the inputs needed for a healthy soil, nitrogen is unique because it originates from the atmosphere. How it moves from the air to the ground is governed in part by a process called biological nitrogen fixation (BNF), which is catalyzed by specific types of bacteria.

Nitrogen supply is frequently the second most limiting factor after water availability constraining crop growth and so there is great farmer demand for accessible sources of nitrogen, such as synthetic nitrogen in fertilizer. This increasing demand has continued as new cereal varieties with higher genetic yield potential are being released in efforts to feed the world’s growing population.

Currently, the primary source for nitrogen is synthetic, delivered through fertilizers. Synthetic nitrogen revolutionized cereal crop (e.g., wheat, maize, and rice) production by enhancing growth and grain yield as it eliminated the need to specifically allocate land for soil fertility rejuvenation during crop rotation. However, synthetic nitrogen is not very efficient, often causing excess application, which leads to deleterious forms, including ammonia, nitrate, and nitrogen oxides escaping into the surrounding ecosystem, resulting in a myriad of negative impacts on the environment and human health. Nitrogen loss from fertilizer is responsible for a nearly 20% increase in atmospheric nitrous oxide since the industrial revolution. Notably, more nitrogen from human activities, including agriculture, has been released to the environment than carbon dioxide during recent decades, leading climate scientists to consider the possibility that nitrogen might replace carbon as a prime driver of climate change.

New research co-authored by International Maize and Wheat Improvement Center (CIMMYT) scientists, published in Field Crops Research, posits that facilitating natural methods of gathering useable nitrogen in BNF can reduce the amount of synthetic nitrogen being used in global agriculture.

As agricultural systems become more intensive regarding inputs and outputs, synthetic nitrogen has become increasingly crucial, but there are still extensive areas in the world that cannot achieve food and nutrition security because of a lack of nitrogen.

“This, together with increasing and changing dietary demands, shows that the future demand for nitrogen will substantially grow to meet the anticipated population of 9.7 billion people by the middle of the century,” said J.K. Ladha, adjunct professor in the Department of Plant Sciences at University of California, Davis, and lead author of the study.

Before the synthetic nitrogen, the primary source of agricultural nitrogen was gathered through BNF as bacteria living underground that convert atmospheric nitrogen into nitrogen that can be utilized by crops. Therefore, legumes are often employed as a cover crop in rotating fields to replenish nitrogen stocks; their root systems are hospitable for these nitrogen producing bacteria to thrive.

“There are ways in which BNF could be a core component of efforts to build more sustainable and regenerative agroecosystems to meet nitrogen demand with lower environmental footprints,” said Timothy Krupnik, Senior System Agronomist at CIMMYT in Dhaka, Bangladesh.

Plant scientists have often hypothesized that the ultimate solution for solving the ever-growing nitrogen supply challenge is to confer cereals like wheat, maize, rice, with their own capacity for BNF. Recent breakthroughs in the genomics of BNF, as well as improvements in the understanding how legumes and nitrogen bacteria interact, have opened new avenues to tackle this problem much more systematically.

“Enabling cereal crops to capture their own nitrogen is a long-standing goal of plant biologists and is referred to as the holy grail of BNF research,” said P.M. Reddy, Senior Fellow at The Energy Research Institute, New Delhi. “The theory is that if cereal crops can assemble their own BNF system, the crop’s internal nitrogen supply and demand can be tightly regulated and synchronized.”

The study examined four methods currently being employed to establish systems within cereal crops to capture and use their own nitrogen, each with their advantages and limitations. One promising method involves identifying critical plant genes that perceive and transmit nitrogen-inducing signals in legumes. Integrating these signal genes into cereal crops might allow them to construct their own systems for BNF.

“Our research highlights how BNF will need to be a core component of efforts to build more sustainable agroecosystems,” said Mark Peoples, Honorary Fellow at The Commonwealth Scientific and Industrial Research Organisation (CSIRO), Canberra, Australia. “To be both productive and sustainable, future cereal cropping systems will need to better incorporate and leverage natural processes like BNF to mitigate the corrosive environmental effects of excess nitrogen leaking into our ecosystems.”

Besides the efforts to bring BNF to cereals, there are basic agronomic management tools that can shift focus from synthetic to BNF nitrogen.

“Encouraging more frequent use of legumes in crop rotation will increase diversification and the flow of key ecosystem services, and would also assist the long-term sustainability of cereal-based farming systems,” said Krupnik.

Read the study: Biological nitrogen fixation and prospects for ecological intensification in cereal-based cropping systems

Cover photo: A farmer in the Ara district, in India’s Bihar state, applies NPK fertilizer, composed primarily of nitrogen, phosphorus and potassium. (Photo: Dakshinamurthy Vedachalam/CIMMYT)

A generalized wiring diagram for wheat, as proposed by the authors. The diagram depicts the traits most commonly associated with the source (left) and sink (right) strengths and others that impact both the sink and source, largely dependent on growth stage (middle). TGW, thousand grain weight.

Diagram links physiological traits of wheat for yield potential

Written by Rodrigo Ordóñez on May 25, 2022. Posted in Press releases.

As crop yields are pushed closer to biophysical limits, achieving yield gains becomes increasingly challenging. Traditionally, scientists have worked on the premise that crop yield is a function of photosynthesis (source), the investment of assimilates into reproductive organs (sinks) and the underlying processes that enable and connect the expression of both. Although the original source-and-sink model remains valid, it must embrace more complexity, as scientific understanding improves.

A group of international researchers are proposing a new wiring diagram to show the interrelationships of the physiological traits that impact wheat yield potential, published on Nature Food. By illustrating these linkages, it shows connections among traits that may not have been apparent, which could serve as a decision support tool for crop scientists. The wiring diagram can inform new research hypotheses and breeding decisions, as well as research investment areas.

The diagram can also serve as a platform onto which new empirical data are routinely mapped and new concepts added, thereby creating an ever-richer common point of reference for refining models in the future.

“If routinely updated, the wiring diagram could lead to a paradigm change in the way we approach breeding for yield and targeting translational research,” said Matthew Reynolds, Distinguished Scientist and Head of Wheat Physiology at the International Maize and Wheat Improvement Center (CIMMYT) and lead author of the study. “While focused on yield potential, the tool can be readily adapted to address climate resilience in a range of crops besides wheat.”

Breeding milestone

The new wiring diagram represents a milestone in deterministic plant breeding. It dovetails simpler models with crop simulation models.

It takes into account how source and sink strengths may interact with wheat developmental stages to determine yield. For example, at the time of stem growth, spike growth or effective grain filling.

This diagram can be used to illustrate the relative importance of specific connections among traits in their appropriate phenological context and to highlight major gaps in knowledge. This graphical representation can also serve as a roadmap to prioritize research at other levels of integration, such as metabolomic or gene expression studies. The wiring diagram can be deployed to identify ways for improving elite breeding material and to explore untapped genetic resources for unique traits and alleles.

Yield for climate resilience

The wheat scientific community is hard at work seeking new ways to get higher yields more quickly to help the world cope with population growth, climate change, wars and stable supplies of calories and protein.

“To ensure food and nutritional security in the future, raising yields must be an integral component of making crops more climate-resilient. This new tool can serve as a roadmap to design the necessary strategies to achieve these goals,” said Jeff Gwyn, Program Director of the International Wheat Yield Partnership (IWYP).

— ENDS —

READ THE FULL PUBLICATION:

A wiring-diagram to integrate physiological traits of wheat yield potential

INTERVIEW OPPORTUNITIES:

Matthew Reynolds – Distinguished Scientist and Head of Wheat Physiology at the International Maize and Wheat Improvement Center (CIMMYT)

Gustavo Ariel Slafer – Research Professor at the Catalonian Institution for Research and Advanced Studies (ICREA) and Associate Professor of the University of Lleida

For more information or to arrange interviews, please contact the CIMMYT media team:

Marcia MacNeil and Rodrigo Ordóñez: https://staging.cimmyt.org/media-center/

ACKNOWLEDGEMENTS:

The study is an international collaboration of scientists from the International Maize and Wheat Improvement Center (CIMMYT), the Catalonian Institution for Research and Advanced Studies (ICREA), the Center for Research in Agrotechnology (AGROTECNIO), the University of Lleida, the University of Nottingham, the John Innes Centre, Lancaster University, Technische Universität München, CSIRO Agriculture & Food, and the International Wheat Yield Partnership (IWYP).

ABOUT CIMMYT:

The International Maize and Wheat Improvement Center (CIMMYT) is an international organization focused on non-profit agricultural research and training that empowers farmers through science and innovation to nourish the world in the midst of a climate crisis.

Applying high-quality science and strong partnerships, CIMMYT works to achieve a world with healthier and more prosperous people, free from global food crises and with more resilient agri-food systems. CIMMYT’s research brings enhanced productivity and better profits to farmers, mitigates the effects of the climate crisis, and reduces the environmental impact of agriculture.

CIMMYT is a member of CGIAR, a global research partnership for a food-secure future dedicated to reducing poverty, enhancing food and nutrition security, and improving natural resources.

For more information, visit staging.cimmyt.org.

ABOUT IWYP:

The International Wheat Yield Partnership (IWYP) represents a long-term global endeavor that utilizes a collaborative approach to bring together funding from public and private research organizations from a large number of countries. Over the first five years, the growing list of partners aims to invest up to US$100 million.

For more information, visit https://iwyp.org

Pragya Timsina interviewing a farmer in Rangpur, Bangladesh. (Photo: Manisha Shrestha/CIMMYT)

Bending gender norms: women’s engagement in agriculture

Written by Marta Millere on February 11, 2022. Posted in News.

Researchers at the International Maize and Wheat Improvement Center (CIMMYT) have studied and witnessed that women, particularly in South Asia, have strongly ingrained and culturally determined gender roles.

While women play a critical part in agriculture, their contributions are oftentimes neglected and underappreciated. Is there any way to stop this?

On International Day of Women and Girls in Science, we spoke to Pragya Timsina about how women’s participation in agriculture is evolving across the Eastern Gangetic Plains and her findings which will be included in a paper coming out later this year: ‘Necessity as a driver of bending agricultural gender norms in South Asia’. Pragya is a Social Researcher at CIMMYT, based in New Delhi, India. She has worked extensively across different regions in India and is currently involved in various projects in India, Nepal and Bangladesh.

What is the current scenario in the Eastern Gangetic Plains of South Asia on gender disparities and women’s involvement in agriculture? Is it the same in all locations that your research covered?

Currently, traditional roles, limited mobility, societal criticism for violating gender norms, laborious unmechanized agricultural labor, and unacknowledged gender roles are among the social and cultural constraints that women face in the Eastern Gangetic Plains. Our research shows that while these norms exist throughout the Eastern Gangetic Plains, there are outliers, and an emerging narrative that is likely to lead to further bending (but not breaking, yet) of such norms.

Are there any factors that limit women from participating in agriculture?

Cultural and religious norms have influence gender roles differently in different households but there are definitely some common societal trends. Traditionally, women are encouraged to take on roles such as household chores, childcare, and livestock rearing, but our research in the Eastern Gangetic Plains found that in specific regions such as Cooch Behar (West Bengal), women were more actively involved in agriculture and even participated in women-led village level farmers’ groups.

How or what can help increase women’s exposure to agricultural activities?

At the community level, causes of change in gender norms include the lack of available labor due to outmigration, the necessity to participate in agriculture due to a labor shortage, and a greater understanding and exposure to others who are not constrained by gendered norms. There are instances where women farmers are provided access and exposure to contemporary and enhanced technology advances, information, and entrepreneurial skills that may help them become knowledgeable and acknowledged agricultural decision makers. In this way, research projects can play an important role in bending these strongly ingrained gendered norms and foster change.

In a context where several programs are being introduced to empower women in agriculture, why do you think they haven’t helped reduce gender inequality?

Our study reveals that gender norms that already exist require more than project assistance to transform.

While some women in the Eastern Gangetic Plains have expanded their engagement in public places as they move away from unpaid or unrecognized labor, this has not always mirrored shifts in their private spaces in terms of decision-making authority, which is still primarily controlled by men.

Although, various trends are likely to exacerbate this process of change, such as a continued shortage of available labor and changing household circumstances due to male outmigration, supportive family environments, and peer support.

What lessons can policymakers and other stakeholders take away to help initiate gender equality in agriculture?

Although gender norms are changing, I believe they have yet to infiltrate at a communal and social level. This demonstrates that the bending of culturally established and interwoven systemic gender norms across the Eastern Gangetic Plains are still in the early stages of development. To foster more equitable agricultural growth, policymakers should focus on providing inclusive exposure opportunities for all community members, regardless of their standing in the household or society.

What future do the women in agriculture perceive?

Increasing development projects are currently being targeted towards women. In certain circumstances, project interventions have initiated a shift in community attitudes toward women’s participation. There has been an upsurge in women’s expectations, including a desire to be viewed as equal to men and to participate actively in agriculture. These patterns of women defying gender norms appear to be on the rise.

What is your take on women’s participation in agriculture, to enhance the desire to be involved in agriculture?

Higher outmigration, agricultural labor shortages, and increased shared responsibilities, in my opinion, are likely to expand rural South Asian women’s participation in agricultural operations but these are yet to be explored in the Eastern Gangetic Plains. However, appropriate policies and initiatives must be implemented to ensure continued and active participation of women in agriculture. When executing any development projects, especially in the Eastern Gangetic Plains, policies and interventions must be inclusive, participatory, and take into account systemic societal norms that tend to heavily impact women’s position in the society.

A rice farmer in central Bangladesh tends to his crop. (Photo: Scott Wallace/World Bank)

New publications: COVID-19 induced economic loss and ensuring food security for vulnerable groups

Written by Emma Orchardson on October 29, 2020. Posted in Publications.

At present, nearly half of the world’s population is under some form of government restriction to curb the spread of COVID-19. In Bangladesh, in the wake of five deaths and 48 infections early in the year, the government imposed a nationwide lockdown between March 24 and May 30, 2020. Until April 17, 38 of the country’s 64 districts were under complete lockdown.

“While this lockdown restricted the spread of the disease, in the absence of effective support, it can generate severe food and nutrition insecurity for daily wage-based workers,” says Khondoker Mottaleb, an agricultural economist based at the International Maize and Wheat Improvement Center (CIMMYT).

Of the 61 million people who make up Bangladesh’s employed labor force, nearly 35% are paid daily. In a new study published in PLOS ONE, Mottaleb examines the food security and welfare impacts of the lockdowns on these daily-wage workers — in both farm and non-farm sectors — who are comparatively more resource-poor in terms of land ownership and education, and therefore likely to be hit hardest by a loss in earnings.

Using information from 50,000 economically active workers in Bangladesh, collected by the Bangladesh Bureau of Statistics (BBS), the study quantifies the economic losses from the COVID-19 lockdowns based on daily-wage workers’ lost earnings and estimates the minimum compensation packages needed to ensure their minimum food security during the lockdown period.

Using the estimated daily wage earnings, the authors estimate that a one-day, complete lockdown generates an economic loss equivalent to $64.2 million. After assessing the daily per capita food expenditure for farm and non-farm households, the study estimates the need for a minimum compensation package of around $1 per day per household to ensure minimum food security for the daily wage-based worker households.

In May 2020, the Government of Bangladesh announced the provision of approximately $24 per month to two million households, half of whom will receive additional food provision. While this amount is in line with Mottaleb’s findings, he stresses than this minimum support package is only suitable for the short-term, and that in the event of a prolonged lockdown period it will be necessary to consider additional support for other household costs such as clothing, medicine and education.

“Without effective support programs, the implementation of a strict lockdown for a long time may be very difficult, if poor households are forced to come out to search for work, money and food,” explains Mottaleb. “In the event of a very strict lockdown scenario, the government should consider issuing movement passes to persons and carriers of agricultural input and output to support smallholder agriculture, wage workers and agricultural value chains.”

Read the full article:
COVID-19 induced economic loss and ensuring food security for vulnerable groups: Policy implications for Bangladesh

Read more recent publications from CIMMYT researchers:

Potential of climate-smart agriculture in reducing women farmers’ drudgery in high climatic risk areas. 2020. Khatri-Chhetri, A., Punya Prasad Regmi, Nitya Chanana, Aggarwal, P.K. In: Climatic Change v. 158, pg. 29-42.
Crop–livestock integration in smallholder farming systems of Goromonzi and Murehwa, Zimbabwe. 2020. Mkuhlani, S., Mupangwa, W., MacLeod, N., Lovemore Gwiriri, Nyagumbo, I., Manyawu, G., Ngavaite Chigede. In: Renewable Agriculture and Food Systems v. 35, no. 3, pg. 249-260.
Effects of maize residue and mineral nitrogen applications on maize yield in conservation-agriculture-based cropping systems of Southern Africa. 2020. Mupangwa, W., Thierfelder, C., Cheesman, S., Nyagumbo, I., Muoni, T., Mhlanga, B., Mwila, M., Sida T.S., Ngwira, A. In: Renewable Agriculture and Food Systems v. 35, no. 2, pg. 322-335.
From interest to implementation: exploring farmer progression of conservation agriculture in Eastern and Southern Africa. 2020. Brown, B., Nuberg, I., Llewellyn, R. In: Environment, Development and Sustainability v. 22, pg. 3159-3177.
Spatial variability of soil physicochemical properties in agricultural fields cultivated with sugarcane (Saccharum officinarum L.) in southeastern Mexico. 2020. Salgado-Velázquez, S., Salgado-García, S., Rincón-Ramírez, J.A., Rodrigues, F., Palma-López, D.J., Córdova-Sánchez, S., López-Castañeda, A. In: Sugar Tech v. 22, pg. 65-75.
Apparent gains, hidden costs: examining adoption drivers, yield, and profitability outcomes of rotavator tillage in wheat systems in Nepal. 2020. Paudel, G.P., Krishna, V.V., McDonald, A. In: Journal of Agricultural Economics v. 71, no. 1, pg. 199-218.
Multi‐site bundling of drought tolerant maize varieties and index insurance. 2020. Awondo, S.N., Kostandini, G., Setimela, P.S., Erenstein, O. In: Journal of Agricultural Economics v. 71, no.1, pg. 239-259.
Leaving no one behind: how women seize control of wheat–maize technologies in Bangladesh. 2020. Farnworth, C.R., Jafry, T., Rahman, S., Badstue, L.B. In: Canadian Journal of Development Studies v. 41, no. 1, pg. 20-39.
Learning adaptation to climate change from past climate extremes: evidence from recent climate extremes in Haryana, India. 2020. Aryal, J.P., Jat, M.L., Sapkota, T.B., Rahut, D.B., Rai, M., Jat, H.S., Sharma, P.C., Stirling, C. In: International Journal of Climate Change Strategies and Management v. 12. No. 1, pg. 128-146.
Climate change mitigation options among farmers in South Asia. 2020. Aryal, J.P., Rahut, D.B., Sapkota, T.B., Khurana, R., Khatri-Chhetri, A. In: Environment, Development and Sustainability v. 22, pg. 3267-3289.
Does climate-smart village approach influence gender equality in farming households? A case of two contrasting ecologies in India. 2020. Hariharan, V.K., Mittal, S., Rai, M., Agarwal, T., Kalvaniya, K.C., Stirling, C., Jat, M.L. In: Climatic Change v. 158, pg. 77-90.
First Report of TTRTF race of wheat stem rust, Puccinia graminis f. sp. tritici, in Ethiopia. 2020. Tesfaye, T., Chala, A., Shikur, E., Hodson, D.P., Szabo, L.J. In: Plant Disease v. 104, no. 1, 293-293.
Multi-level socioecological drivers of agrarian change: longitudinal evidence from mixed rice-livestock-aquaculture farming systems of Bangladesh. 2020. Aravindakshan, S., Krupnik, T.J., Groot, J.C.J., Speelman, E. N., Amjath Babu, T.S, Tittonell, P. In: Agricultural Systems v. 177, art. 102695.
Carbon sequestration potential through conservation agriculture in Africa has been largely overestimated: comment on: “Meta-analysis on carbon sequestration through conservation agriculture in Africa”. 2020. Corbeels, M., Cardinael, R., Powlson, D.S., Chikowo, R., Gerard, B. In: Soil and Tillage Research v. 196, art. 104300.
Operationalizing the concept of robustness of nitrogen networks in mixed smallholder systems: a pilot study in the mid-hills and lowlands of Nepal. 2020. Alomia-Hinojosa, V., Groot, J.C.J., Speelman, E. N., Bettinelli, C., McDonald, A., Alvarez, S., Tittonell, P. In: Ecological Indicators v. 110, art. 105883.
The spread of smaller engines and markets in machinery services in rural areas of South Asia. 2020. Justice, S., Biggs, S. In: Journal of Rural Studies v. 73, pg. 10-20.
Functional farm household typologies through archetypal responses to disturbances. 2020. Tittonell, P., Bruzzone, O., Solano-Hernández, A., Lopez-Ridaura, S., Easdale, M.H. In: Agricultural Systems v. 178, art. 102714.
Data on a genome-wide association study of type 2 diabetes in a Maya population. 2020. Totomoch-Serra, A., Domínguez-Cruz, M.G., Muñoz, M. de L., García-Escalante, M.G., Burgueño, J., Diaz-Badillo, A., Valadez-González, N., Pinto-Escalantes, D. In: Data in Brief v. 28, art. 104866.
On-farm performance and farmers’ participatory assessment of new stress-tolerant maize hybrids in Eastern Africa. 2020. Regasa, M.W., De Groote, H., Munyua, B., Makumbi, D., Owino, F., Crossa, J., Beyene, Y., Mugo, S.N., Jumbo, M.B., Asea, G., Mutinda, C.J.M., Kwemoi, D.B., Woyengo, V., Olsen, M., Prasanna, B.M. In: Field Crops Research v. 246, art. 107693.
Different uncertainty distribution between high and low latitudes in modelling warming impacts on wheat. 2020. Wei Xiong, Asseng, S., Hoogenboom, G., Hernandez-Ochoa, I.M., Robertson, R., Sonder, K., Pequeno, D.N.L., Reynolds, M.P., Gerard, B. In. Nature Food v. 1, pg. 63-69.
Gender relations along the maize value chain in Mozambique. 2020. Adam, R.I., Quinhentos, M., Muindi, P., Osanya, J. In: Outlook on Agriculture v. 49, no. 2, pg. 133–144.
Genetic dissection of zinc, iron, copper, manganese and phosphorus in wheat (Triticum aestivum L.) grain and rachis at two developmental stages. 2020. Cu, S.T., Guild, G., Nicolson, A., Velu, G., Singh, R.P., Stangoulis, J. In: Plant Science v. 291, art. 110338.
Indigenous knowledge of traditional foods and food literacy among youth: insights from rural Nepal. 2020. Gartaula, H., Patel, K., Shukla, S., Devkota, R. In: Journal of Rural Studies v. 73, pg. 77-86.
Analysis of household access to drinking water, sanitation, and waste disposal services in urban areas of Nepal. 2020. Behera, B., Rahut, D.B., Sethi, N. In: Utilities Policy v. 62, art. 100996.
Mapping of QTL for partial resistance to powdery mildew in two Chinese common wheat cultivars. 2020. Xiaoting Xu, Zhanwang Zhu, Aolin Jia, Fengju Wang, Jinping Wang, Yelun Zhang, Chao Fu, Luping Fu, Guihua Bai, Xianchun Xia, Yuanfeng Hao, He Zhonghu In: Euphytica v. 216, no. 1, art. 3.
Enabling smallholder farmers to sustainably improve their food, energy and water nexus while achieving environmental and economic benefits. 2020. Gathala, M.K., Laing, A.M., Tiwari, T.P., Timsina, J., Islam, Md.S., Chowdhury, A.K., Chattopadhyay, C., Singh, A.K., Bhatt, B. P., Shrestha, R., Barma, N.C.D., Dharamvir Singh Rana, Jackson, T., Gerard, B. In: Renewable and Sustainable Energy Reviews v. 120, art. 109645.
Harnessing wheat Fhb1 for Fusarium resistance. 2020. Yuanfeng Hao, Rasheed, A., Zhanwang Zhu, Wulff, B.B.H., He Zhonghu In: Trends in Plant Science v. 25, no. 1, pg. 1-3.
Energy-efficient, sustainable crop production practices benefit smallholder farmers and the environment across three countries in the Eastern Gangetic Plains, South Asia. 2020. Gathala, M.K., Laing, A.M., Tiwari, T.P., Timsina, J., Saiful Islam, Bhattacharya, P.M., Dhar, T., Ghosh, A., Sinha, A.K., Chowdhury, A.K., Hossain, S., Hossain, M.I., Molla, M.S.H., Rashid, M., Kumar, S., Kumar, R., Dutta, S.K., Srivastwa, P.K., Chaudhary, B., Jha, S.K., Ghimire, P., Bastola, B., Chaubey, R.K., Kumar, U., Gerard, B. In: Journal of Cleaner Production v. 246, art. 118982.

Feature image: A rice farmer in central Bangladesh tends to his crop. (Photo: Scott Wallace/World Bank).

Global climate frameworks miss the ‘big picture’ on food

Written by Mary Donovan on February 19, 2020. Posted in In the media.

Global schemes to fight climate change may miss their mark by ignoring the fundamental connections in how food is produced, supplied and consumed, scientists say in a new paper published in the journal Nature Food.

Looking forward, looking back

Written by Rodrigo Ordóñez on May 23, 2019. Posted in News.

Participants in the five-year workshop for the SRFSI project in Kathmandu in May 2019 stand for a group shot. (Photo: CIMMYT)

Over 50 stakeholders from the Sustainable and Resilient Farming Systems Intensification in the Eastern Gangetic Plains (SRFSI) project engaged in three days of reflection and planning in Kathmandu, Nepal, in early May 2019. Partners from four countries focused on identifying key learnings across a range of topics including value chains, business models, agricultural extension, capacity building, innovation platforms and policy convergence. After almost five years of project activities, there was naturally plenty of vibrant discussion.

The cross-cutting themes of gender and climate change were considered within each topic, to capture project outputs beyond participation and farm level impact. Discussions around gender confirmed the benefits of targeted women’s participation and ensuring that women’s availability was accommodated. Working within the SRFSI project, researchers have identified new business opportunities for women, with benefits for individuals and community groups. In terms of business models, it was highlighted that promoting gender-inclusive strategies for all partners, including the private sector, is necessary. Ensuring a wide range of partnership institutions, such as NGOs with women-centric programs, is also beneficial for reaching more women.

In the five-year SRFSI workshop, participants discussed research outputs and planned the year ahead. (Photo: CIMMYT)

Conservation agriculture-based sustainable intensification techniques have been confirmed as contributing to climate-resilient farming systems, both in terms of mitigation and adaptation. Importantly, the project has demonstrated that these systems can be profitable, climate smart business models in the Eastern Gangetic Plains. They were also seen as fitting well with government plans and policies to address climate change, which was demonstrated by convergence with country and NGO programs that are focused on climate change adaptation.

In keeping with the recently approved no-cost extension of the SRFSI project until June 2020, the final sessions identified remaining research questions in each location and scaling component, and project partners nominated small research activities to fill these gaps. The final year of SRFSI is an excellent opportunity to capture valuable lessons and synthesise project outputs for maximum impact.

The Sustainable and Resilient Farming Systems Intensification Project is a collaboration between the International Maize and Wheat Improvement Center (CIMMYT) and the project funder, the Australian Centre for International Agricultural Research (ACIAR).

Sustainable and Resilient Farming Systems Intensification in the Eastern Gangetic Plains (SRFSI)

Written by Mary Donovan on April 12, 2019. Posted in Uncategorized.

The Eastern Gangetic Plains region of Bangladesh, India, and Nepal is home to the greatest concentration of rural poor in the world. This region is projected to be one of the areas most affected by climate change. Local farmers are already experiencing the impact of climate change: erratic monsoon rains, floods and other extreme weather events have affected agricultural production for the past decade. The region’s smallholder farming systems have low productivity, and yields are too variable to provide a solid foundation for food security. Inadequate access to irrigation, credit, inputs and extension systems limit capacity to adapt to climate change or invest in innovation. Furthermore, large-scale migration away from agricultural areas has led to labor shortages and increasing numbers of women in agriculture.

The Sustainable and Resilient Farming Systems Intensification (SRFSI) project aims to reduce poverty in the Eastern Gangetic Plains by making smallholder agriculture more productive, profitable and sustainable while safeguarding the environment and involving women. CIMMYT, project partners and farmers are exploring Conservation Agriculture-based Sustainable Intensification (CASI) and efficient water management as foundations for increasing crop productivity and resilience. Technological changes are being complemented by research into institutional innovations that strengthen adaptive capacity and link farmers to markets and support services, enabling both women and men farmers to adapt and thrive in the face of climate and economic change.

In its current phase, the project team is identifying and closing capacity gaps so that stakeholders can scale CASI practices beyond the project lifespan. Priorities include crop diversification and rotation, reduced tillage using machinery, efficient water management practices, and integrated weed management practices. Women farmers are specifically targeted in the scaling project: it is intended that a third of participants will be women and that at least 25% of the households involved will be led by women.

The 9.7 million Australian dollar (US$7.2 million) SRFSI project is a collaboration between CIMMYT and the project funder, the Australian Centre for International Agricultural Research. More than 20 partner organizations include the Departments of Agriculture in the focus countries, the Bangladesh Agricultural Research Institute, the Indian Council for Agricultural Research, the Nepal Agricultural Research Council, Uttar Banga Krishi Vishwavidyalaya, Bihar Agricultural University, EcoDev Solutions, iDE, Agrevolution, Rangpur-Dinajpur Rural Services, JEEViKA, Sakhi Bihar, DreamWork Solutions, CSIRO and the Universities of Queensland and Western Australia.

OBJECTIVES

Understand farmer circumstances with respect to cropping systems, natural and economic resources base, livelihood strategies, and capacity to bear risk and undertake technological innovation
Develop with farmers more productive and sustainable technologies that are resilient to climate risks and profitable for smallholders
Catalyze, support and evaluate institutional and policy changes that establish an enabling environment for the adoption of high-impact technologies
Facilitate widespread adoption of sustainable, resilient and more profitable farming systems

Zero-tillage service provision is key to facilitating adoption.

Service provider Azgad Ali and farmer Samaru Das have a fruitful relationship based on technology promoted through CIMMYT’s SRSFI project.

A zero-tillage multi-crop planter at work in West Bengal.

Bablu Modak demonstrates his unpuddled mechanically transplanted rice.

CIMMYT’s SRFSI team and the community walk through the fields during a field visit in Cooch Behar.

CSIRO and CIMMYT link on wheat phenomics, physiology and data

Written by Mike Listman on June 26, 2017. Posted in Features.

Building on a more than 40-year-old partnership in crop modelling and physiology, a two-day workshop organized by CIMMYT and Australia’s Commonwealth Scientific and Industrial Research Organisation (CSIRO) achieved critical steps towards a common framework for field phenotyping techniques, data interoperability and sharing experience.

Involving 23 scientists from both organizations and held at El Batán from 12 to 13 June 2017, the event emerged partly from a 2016 visit to CIMMYT by CSIRO Agriculture and Food executives and focused on wheat, according to Matthew Reynolds, CIMMYT wheat physiologist and distinguished scientist.

“Capitalizing on our respective strengths, we developed basic concepts for several collaborations in physiology and breeding, and will follow up within ongoing projects and through pursuit of new funding,” Reynolds said, signaling the following:

Comparison of technologies to estimate key crop traits, including GreenSeeker and hyperspectral images, IR thermometry, digital imagery and LiDAR approaches, while testing and validating prediction of phenotypic traits using UAV (drone) imagery.
Study of major differences between spike and leaf photosynthesis, and attempts to standardize gas exchange between field and controlled environments.
Work with breeders to screen advanced lines for photosynthetic traits in breeding nurseries, including proof of concept to link higher photosynthetic efficiency / performance to biomass accumulation.
Validation/testing of wheat simulation model for efficient use of radiation.
Evaluation of opportunities to provide environment characterization of phenotyping platforms, including systematic field/soil mapping to help design plot and treatment layouts, considering bioassays from aerial images as well as soil characteristics such as pH, salinity, and others.
Testing the heritability of phenotypic expression from parents to their higher-yielding progeny in both Mexico and Australia.
Extraction of new remote sensed traits (e.g., number of heads per plot) from aerial images by machine learning (ML) of scored traits by breeders and use of ML to teach those to the algorithm.
Demonstrating a semantic data framework’s use in identifying specific genotypes for strategic crossing, based on phenotypes.
Exchanging suitable data sets to test the interoperability of available data management tools, focusing on the suitability of the Phenomics Ontology Driven Data (PODD) platform for phenotypic data exchanges, integration, and retrieval.

The shared history of the two organizations in wheat physiology goes back to the hiring by Dr. Norman E. Borlaug, former CIMMYT wheat scientist and Nobel Prize laureate, of post-doctoral fellow Tony Fischer in 1970. Now an Honorary Research Fellow at CSIRO, Fischer served as director of CIMMYT’s global wheat program from 1989 to 1996 and developed important publications on wheat physiology earlier in his career, based on data from research at CIMMYT. In the early 1990s, Lloyd Evans, who established the Canberra Phytotron at CSIRO in the 1970s, served on CIMMYT’s Board of Trustees. Former CIMMYT maize post-doc Scott Chapman left for CSIRO in the mid-1990s but has partnered continuously with the Center on crop modelling and remote sensing. With funding from the Australian Centre for International Agricultural Research (ACIAR) in the late 1990s, CSIRO scientists Richard Richards, Tony Condon, Greg Rebetzke and Graham Farquhar began shared research with Reynolds and Martin van Ginkel, a CIMMYT wheat breeder, on stomatal aperture traits. Following work at CSIRO with Lynne McIntyre and Chapman, scientist Ky Matthews led the CIMMYT Biometrics Group from 2011 to 2012, collaborating with CIMMYT wheat physiologists on a landmark project to map complex physiological traits using the purpose-designed population, Seri/Babax. Reflecting the recent focus on climate resilience traits, Fernanda Dreccer of CSIRO is helping CIMMYT to establish the Heat and Drought Wheat Improvement Consortium (HeDWIC), among other important collaborations.

Scientists uncover DNA sequence of key wheat disease resistance gene

Written by on February 28, 2009. Posted in News.

A global team of researchers that includes CIMMYT scientists has uncovered the molecular basis of a “wonder” gene that, in tandem with other resistance genes, has helped protect wheat from three deadly fungal diseases for more than 50 years, providing farmers benefits in excess of USD five billion in harvests saved.

Since the 1970s farmers have used wheat varieties that are resistant to leaf rust, a major fungal crop disease. Without these rust-resistant varieties, wheat farmers would have lost USD 5.36 billion in harvests. [Economics Program Paper 04-01] Now, a study in this month’s issue of the renowned Science journal has reported the sequencing of Lr34—a key gene underlying this “durable” resistance in wheat to leaf rust and to two other major diseases of the crop: stripe rust and powdery mildew. Until now, no one knew much about Lr34‘s physiological action. Uncovering its DNA sequence allowed the scientists to understand how the gene works.

“Combined with other minor-action genes, Lr34 does occasionally permit the pathogen to colonize and grow on the plant,” says Ravi Singh, CIMMYT wheat geneticist/pathologist and co-author of the Science report, “but it causes the disease to develop so slowly that yield losses are negligible. Lr34 has proven so useful that it’s been bred into wheat cultivars sown on more than 26 million hectares in various developing countries.”

Researchers from the University of Zurich and the Commonwealth Scientific and Industrial Research Organization of Australia (CSIRO) worked with Singh and co-author Julio Huerta-Espino, a rust scientist from Mexico’s national agricultural research institute, INIFAP, to sequence Lr34 and conduct combined molecular and field tests to uncover the gene’s resistance action. Among other things, they found that it behaves in a way unique from so-called “major” resistance genes.

The Lr34 gene encodes an adenosine-triphosphate (ATP) binding cassette transporter, according to CSIRO scientist Evans Lagudah, also a co-author on the Science report. ATP is a multifunctional “nucleotide”—a type of molecule that comprises the structure of DNA. It typically transports chemical energy within cells for metabolism. “In mammals, for example, ATP binding cassette transporters underlie resistance to chemo-therapeutic drugs in cancer treatment, where the transporters can pump out the drugs from the cancer cells,” says Lagudah. “In plants, certain transporters can inhibit or reduce pathogen colonization in infected tissues.”

Science in a deadly “arms race” against rust

In early research to breed rust-resistant wheat lines, scientists depended heavily on resistance genes showing “major” action; that is, completely blocking the entry or development of specific races of the rust fungus. This approach resulted in varieties that would yield well for some years—there was no predicting how long—but which would eventually fall to new, more virulent rust strains. “The major genes typically include a protein that ‘recognizes’ a protein in the pathogen, triggering the resistance reaction,” says Singh. “But with even a minute mutation in that pathogen protein, the resistance gene would no longer ‘detect’ an infection, no plant defense would be triggered, and the pathogen would thus regain virulence.”

Because of this, the wheat fields where farmers have sown varieties protected only by major resistance genes can be hit with sudden, potentially disastrous rust epidemics, as occurred in a large wheat-growing area in northern Mexico in the late 1970s. “The government and research organizations of the time were forced to undertake an expensive, military-like operation to quickly import and apply enough fungicide to avoid a total crop failure,” says Huerta-Espino.

To address such breakdowns in resistance, CIMMYT adopted a breeding strategy that entailed searching among diverse sources for resistance genes which, like Lr34, have small, additive effects that work across rust races. Researchers then would breed several such genes into high-yielding wheat varieties, according to Singh. “When CIMMYT wheat breeder Sanjaya Rajaram first implemented this strategy, it sounded good in theory, but there was no guarantee it would work,” says Singh. “The decision seems obvious now, but back then it was so risky that few breeding programs were willing to undertake it.”

The upshot for breeders

In addition to elucidating Lr34‘s cell-level action, the benefits of the new study include the development of a precise DNA marker for Lr34‘s presence in wheat varieties. This tool will allow breeders to manipulate the gene better in crosses or, according to Singh, focus on slow-rusting genes from other sources. “There are genes that appear to behave similarly to Lr34, but are different and are located elsewhere on the chromosome,” he says. “Because Lr34 is so common in our breeding materials, it’s hard to isolate these other genes. With the new marker, we can select against Lr34 to develop experimental wheat lines from which we’re sure it’s absent.” The lines can then be used in research on other slow-rusting genes and perhaps to create a wholly distinct type of resistance

Singh says CIMMYT is involved in additional work on other slow-rusting genes, similar to that reported in Science. “Collaboration is crucial in such studies,” he says. “No single group can handle the required lab and field work on its own.” He also hopes the Science report will prompt other groups to analyze slow-rusting genes, instead of the more-easily-studied major race-specific genes: “With demand going up and rising grain prices, and higher temperatures possibly favoring the emergence of new pathogen strains in developing country cropping areas, farmers need all the help they can get from research on disease resistance in staple cereals.”