CIMMYT holds the fourth edition of seed and mechanization fairs in Mwenezi and Masvingo rural districts, and introduces a groundbreaking mechanization component thanks to the Feed the Future Zimbabwe Mechanization and Extension Activity.
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The future direction of oilseeds appears to be closely tied to patents around seed technology, as industry and governments plan for a net-zero future. CIMMYT’s germplasm bank is available worldwide and relies heavily on collaborations with public and private entities, where breeding is a critical part of partnerships to further foster thriving markets.
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Nepal’s traditional farming system faces labor shortages, and climate-induced risks to crop production, infrastructure, investment, and agro-advisory tools. This calls for urgently redesigning agriculture practices and addressing the challenges and a noticeable shift in farmers’ interests in farming practices.
The International Water Management Institute and CIMMYT, in collaboration with local governments in Gurbakot Municipality of Surkhet and Haleshi Tuwachung Municipality of Khotang, conducted research on Sustainable Intensification of Mixed Farming System (SI-MFS), the research found a noticeable shift in farmers’ interests in farming practices.
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CIMMYT joins with members of the international development community to mourn the passing of renowned wheat geneticist and “Father of the Green Revolution in India,” Monkombu Sambasivan Swaminathan who died on September 27 at the age of 98.
Swaminathan devoted his life to sustainably feeding the world. His vision reshaped India almost overnight to a breadbasket for South Asia, through adoption of innovative high-yield wheat varieties and efficient farming techniques for Indian farmers. TIME magazine acclaimed him as one of the twenty most influential Asians of the 20th Century, making him one of three from India to be named alongside Mahatma Gandhi and Rabindranath Tagore.
Swaminathan began his career in the world of academia. After earning his Ph.D. in plant genetics from Cambridge University in 1952, he moved to the United States to continue his research as a professor; however, his home country India eventually called him back home. With the crisis of a rapidly increasing population and low food production, Swaminathan returned to become a scientist at the Indian Agricultural Research Institute (IARI), where he later served as Director from 1961 to 1972.
It was during this time that he began his collaboration scientist Norman Borlaug, future Nobel Prize laureate and soon to be leader of CIMMYT wheat research. Swaminathan saw the value of the Mexican semi-dwarf wheat varieties, which were developed by Borlaug, for wheat production in India and requested that Borlaug send him a range of breeding materials containing the Norin dwarfing genes. The seeds arrived in 1963 along with Borlaug and the pair travelled the wheat-belt of India. Swaminathan arranged multi-location trials for the varieties and established an inter-disciplinary team to adapt the new varieties for Indian conditions.
The next step was convincing local farmers to grow the varieties. By 1966, Swaminathan had established 2,000 model farms where farmers could see for themselves the benefits of the new wheats. Swaminathan’s final act in kickstarting the Green Revolution in India was to successfully lobby the Indian government to import 18,000 tons of the Mexican seed.
Just 4 years later India’s wheat harvest had doubled to 20 million tons, ending the nation’s dependence on wheat imports and saving millions from starvation. Swaminathan continued to work with the Indian government to maintain food security and long-term self-sufficiency across the country and the impact of his work earned him the first World Food Prize in 1987.
Swaminathan held a number of leadership roles in world agricultural and conservation organizations over his lifetime, including the FAO council, the International Union for the Conservation of Nature and Natural Resources, the World Wide Fund for Nature (India), and the National Academy of Agricultural Sciences. He also served as Director General of the Indian Council of Agricultural Research (ICAR), and Secretary to the Government of India at the Department of Agricultural Research and Education from 1972-79, as well as Director General of the International Rice Research Institute in the Philippines from 1982-88.
A humanitarian at heart
Not just a scientist, Swaminathan was an advocate and humanitarian. Shortly after winning the World Food Prize, he used the award funds to establish a research center, the M.S. Swaminathan Research Foundation (MSSRF), in Chennai, India. The MSSRF allowed him to work on his other passion, sustainable development, where he coordinated research and action on conservation of endangered species, protection of coastal ecosystems, precision farming, ecotechnology, community education and technical training, and programs for rural internet access.
He has received 84 honorary doctorate degrees from universities around the world and multiple awards including the Padma Shri (1967), Padma Bhushan (1972) and Padma Vibushan (1989) – the fourth, third and second highest civilian awards in India. He has also won numerous international awards including the 1994 UNEP Sasakawa Environment Prize, the UNESCO Gandhi Gold Medal in 1999 and the Franklin D. Roosevelt Four Freedoms Award in 2000.
“He was a real gentleman with a sharp memory,” recalls CIMMYT distinguished scientist Ravi Singh. “I always admired his capacity and his ability to link complicated topics into a nice synthesis.”
He was an inspiration to thousands and will be greatly missed for his scientific brilliance, his pioneering advocacy and humanitarianism, and his life mission to reduce world hunger through improved technology for citizens from all levels of society.
The CIMMYT family extends its deepest condolences to the Swaminathan family.
In a September 12 visit to CIMMYT facilities on the agricultural research station of the Kenya Agricultural and Livestock Research Organization (KALRO) at Kiboko, Bram Govaerts, CIMMYT director general, extolled the longstanding partnership with KALRO and suggested creating a platform to speed access of national researchers to improved breeding lines and populations.
Located 155 kilometers southeast of Nairobi in a dryland area better suited to raising cattle, goats, sheep, and camels than row crops, the Kiboko station comprises more than 15,000 hectares, with controlled irrigation systems, and has allowed efficient selection for tolerance to drought and insect pests in Africa-adapted maize, as well as the development of dryland crops such as pigeon pea, sorghum and groundnuts.
“Our recent work where we open up our maize and wheat research platform for dryland crops highlights CIMMYT efforts to diversify cropping options for farmers in challenging settings, enhancing their livelihoods and farming system resilience,” Govaerts said.
Yoseph Beyene, CIMMYT maize breeding coordinator for Africa, described collaborative efforts to speed the breeding and deployment of climate-resilient varieties. “This work covers maize breeding and seed system networks, participatory engagement with farming communities through on-farm trials, interactions and sharing with global partners, and documenting the adoption of stress tolerant maize in sub-Saharan Africa,” Beyene explained.
CIMMYT data show that drought-tolerant maize varieties derived from shared research of the Center, CGIAR and partners are being sown on more than 6 million hectares in 9 countries of eastern and southern Africa, benefitting an estimated 38 million people and producing additional grain worth as much as US$1.5 billion each year.
Beyene added that the expansion of on-farm testing to over 1,000 locations in eastern and southern Africa has enabled CIMMYT to assess preferences and genotype-by-environment interactions which, along with support from the seed systems team regarding small-scale farmers’ acceptance of drought-tolerant maize hybrids, have underpinned the development of successful hybrids.
A prominent stop on Govaerts’s tour was the maize double haploid (DH) facility established in Kiboko in 2013, with funding from the Bill & Melinda Gates Foundation.
Long used by private seed companies, the double haploid approach generates inbred lines that are completely “homozygous,” wherein genes on each pair of chromosomes are identical. It achieves this in a single year, compared to three to four years for conventional inbreeding, which can produce lines that may not be purely homozygous and are thus less useful for breeders.
“The facility offers double haploid line production services for organizations throughout Africa and is key to increasing genetic gains in maize breeding,” said Aparna Das, technical program manager for CIMMYT’s Global Maize Program.
Govaerts also visited the fall armyworm (FAW) artificial screening site and experiments in which CIMMYT scientists are evaluating five new FAW-tolerant experimental varieties for possible sharing with partners. In the fall armyworm screening facility, a team works to integrate and test ecofriendly crop management solutions against fall armyworm, critical research to safeguard agricultural production against this highly destructive insect pest.
“The excellent teamwork and facilities at Kiboko point up multiple opportunities for KALRO and CIMMYT to continue joint work that advances agricultural science to benefit farmers and consumers,” Govaerts concluded.
As hotter temperatures and drought become the norm in places used to growing wheat, yields will be reduced, climate change will have some effect on most of the world’s wheat. CIMMYT is working to strengthen seed systems as demand for staple crops like wheat is only expected to increase as the climate crisis makes the world’s food system more vulnerable.
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CIMMYT scientists, researchers and subject experts participated in the Zimbabwe Agricultural Show (ZAS) from August 28–September 2 in Harare, Zimbabwe. The 113th edition ran under the theme “Sustained Growth. Adaptation. Productivity. Linkages.”
“CIMMYT has a long history of working with local partners in Zimbabwe. Together with these partners, we work to improve the livelihoods and resilience of smallholder farmers, through innovations we develop like stress resilient maize or wheat varieties, together with conservation agriculture technologies,” said Mainassara Zaman-Allah, CIMMYT Zimbabwe country representative.
With an average of 200 visitors per day at CIMMYT’s stand, stemming from small-scale farmers, government representatives, seed companies, university personnel, NGOs and media among others, this platform continues to pave the way for synergies, learning and networking. Beyond raising awareness on the progressive work being done, CIMMYT used this opportunity to interact with local seed companies (SEEDCo, Agriseeds, K2, among others) and get valuable feedback from farmers, including those involved in the maize regional on-farm variety evaluation.
The place to be for agricultural development in Zimbabwe
The Zimbabwe Agricultural Show, organized by the Zimbabwe Agricultural Society, is a dynamic event that serves as the premier platform for the facilitation and promotion of agricultural development in Zimbabwe. With over 550 commercial exhibitors, 700 farmers, 200 micro enterprises, the show presents a unique business opportunity for national and regional organizations.
The event provides a platform to showcase brands, market services, and engage in various business discussions targeting important sectors. The show is capped by the Annual National Agribusiness Conference.
Advancing innovation in Zimbabwe
The Zimbabwe Agricultural Show served as an ideal platform for CIMMYT to share its research findings, exchange knowledge and foster collaborations with farmers, policymakers and other stakeholders in the agriculture sector.
CIMMYT staff provided information regarding its ongoing initiatives and the transformative potential of innovations. We encouraged participants, partners and value chain players to visit the CIMMYT booth to engage with researchers, explore our latest research and discuss innovative agricultural practices.
“Our work in Zimbabwe, like promoting the increased adoption of climate-resilient innovations in mixed crop-livestock production systems and strengthening local food systems through agroecological advances, would not be possible without the strong collaborations with local partners,” said Isaiah Nyagumbo, regional cropping systems agronomist. “And the Zimbabwe Agricultural Show is the best place to continue those partnerships and start new linkages.”
ZAS and CIMMYT
Established in 1895 and operating from The Business Hub (Formerly Exhibition Park), the ZAS is the epicenter for the promotion and facilitation of national agricultural development. It is the oldest convenor and host of agricultural, commercial, and industrial shows in Zimbabwe.
CIMMYT is a core CGIAR Research Center dedicated to reducing poverty, enhancing food and nutrition security, and preserving natural resources in the Global South.
Thomas A. Lumpkin, talks to China Today about his views on global coordination and cooperation, and reiterates his belief that China and the U.S. should play a leading role by working together. Lumpkin also discusses his interest in China’s traditional farming techniques and calls for stronger bilateral cooperation to address common global challenges.
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Seed the World Group hosted a webinar to find a common ground between public and private breeding programs in North America and some possible paths forward. Fernando Gonzalez, a retired plant breeder from CIMMYT mentioned a noticeable uptick in the involvement of the private sector in breeding programs in Mexico.
Learn more about the primary goals underlying public and private breeding efforts.
Women play a critical role in the future of food security. Female farmers face a significant disadvantage before they ever plow a field or sow a seed. Farming is a challenging profession, and it is even more challenging for women when they perform these functions whilst facing numerous constraints.
Nur-A-Mahajabin Khan, communications officer, showcases how fodder chopper technology is improving the lives of women farmers in rural Bangladesh.
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Millions of rural Indians, mostly farmers, are at the mercy of changing weather and climate change. Rising temperature and heat stress, unpredictable rainfall patterns, increasing drought-like situations, soil erosion and depleting water tables are leading to poorer yields and reduced income for farmers. While the agricultural sector and farmers are most affected by the adverse impacts of climate change, it is also one of the sectors significantly responsible for greenhouse gas emissions, contributing about 14% of the total greenhouse gas emissions in the country.
Good agronomy and soil management through conservation agriculture practices such as no-till farming, crop rotation, and in-situ crop harvest residue management are resource efficient and help reduce greenhouse gas emissions significantly. The intensification of these conservation agriculture practices by the Cereal Systems Initiative for South Asia (CSISA)—a regional project led by CIMMYT to sustainably enhance cereal crop productivity and improve smallholder farmers’ livelihoods in Bangladesh, India, and Nepal—and partners is helping smallholder farmers to improve their yield and income with less input costs.
Climate smart agriculture
Over 70% of Bihar’s population is engaged in agriculture production, with wheat and rice as the two major crops grown in the state. Bordering Uttar Pradesh, Buxar, is one of the many rural districts in Bihar, with over 108,000 hectares of land used for agriculture. The area is plain, fertile and has good irrigation facilities. The rice-wheat cropping system forms the dominant practice here, and pulses and other non-cereal crops are grown additionally during winters.
CSISA began promoting zero tillage in wheat cultivation in the area in 2010. Along with Krishi Vigyan Kendras (KVKs), and local agriculture departments, awareness and frontline demonstrations on different best management practices were conducted to inform farmers of alternative approaches to cultivating wheat and rice sustainably. Farmers were used to conventional farming methods, with more input costs and labor-intensive practices. In addition, as farmers were growing long-duration rice varieties, they typically sowed wheat in late November to early December, which meant harvesting in late April/May. Harvesting wheat this late caused yield losses due to terminal heat stress at the grain filling stage. With increasingly hot temperatures in recent years due to climate change, yield loss in wheat is imminent.
To help curb these yield losses, researchers and officials began promoting early sowing of wheat through a technology called zero tillage in the region, with sowing recommended before mid-November. As expected, this helped farmers to escape high temperature stress at the time of the dough stage, thus, saving grain shrinkage and yield loss at harvest. Zero tillage technology is a tested method with the potential to increase crop productivity through better time management and reduced input cost.
Deepak Kumar Singh, scientist at CSISA who has been supporting agri-extension efforts in the region for nearly a decade recalled how CSISA and partners were able to get more farmers on board with zero tillage and early wheat sowing:
“The best practices of zero till technology and early wheat sowing were encouraged widely through exposure visits, demonstration trials on progressive farmers’ fields, and providing support from local KVKs for machines and quality seeds, including the promotion of private service providers,” he said.
As more farmers were reached through field events, with visible on-field results during public harvest activities held at demonstration fields by CSISA and KVKs, the region gradually adopted early wheat sowing, zero tillage and direct seeded rice technologies. Currently, in the district, it is estimated that over 40% of wheat cultivation under the rice-wheat system is through zero till, helping farmers obtain better yield and profits.
Rice-wheat cropping systems, resilient and sustainable in increasingly changing climate
Rajapur, a small village in Buxar district, boasts 100% adoption of zero tillage in wheat cropping. We met farmer Rahul Rai whose family has been involved in farming for generations. The family owns over thirty acres of land with agriculture as the primary source of income. His father and his siblings were used to conventional farming methods. The produce from their farm was sufficient for household consumption and with the little extra left, they sold and made some income. On the significance of agriculture and farming for his family, Rahul Rai says, “this farmland has been feeding and supporting 17 members in our joint household.”
When young Rahul Rai got down to work in the family fields in the early 2000s, he was keen to explore possibilities to improve the income generated from the farm. Initially, like many others, he was engaged in intensive farming. According to Rai, “with the input costs rising daily, including scarce labor and soil health deterioration, bringing in some extra income seemed unsustainable”.
He first met researchers from the CSISA project and local KVK scientists in early 2011 in the neighboring village. The team was there to inform farmers about conservation agriculture practices and how to better manage yield and maintain soil health. Rai soon became more curious about the benefits of adopting these new methods over conventional practices. He started with a few acres with zero tillage and began sowing wheat by early November, as recommended by the scientists. In Rabi 2022-23, his wheat fields were sown by November 11, compared to the early years when the sowing date was around December.
With more participation and engagement with CSISA, in 2017, he joined other farmers from the region on an exposure visit to Patna organized by the CSISA-KVK network. In Patna, at the Indian Council of Agri Research – Research Complex for Eastern Region (ICAR-RCER), Rai and the visiting farmers were introduced to conservation agri-technologies for rice-wheat and other cropping systems. During the visit, they were informed about crop rotation and diversification, new seed varieties that are resilient and adaptable to changing climates, efficient use of plant protection chemicals and fertilizer and various subsidies from the center/state government to farmers. He later accompanied other progressive farmers on a CSISA-led travel seminar to Gorakhpur in 2017, where he observed acres and acres of wheat fields cultivated through zero tillage and early sowing that had yielded 6-7 tons per hectare (t/ha) on average.
At present, Rai’s family cultivates only zero till wheat in their fields and direct seeded rice on a few acres where irrigation facilities are well established. Rai asserts that until 2014, the wheat yield was about 10-15 quintals per acre (3.5-4 t/ha), rising to around 20-25 quintals per acre on average (5.5 t/ha in 2023) in recent years, thanks to conservation agriculture practices.
Today, the CSISA team has system optimization and demonstration trials on fields owned by Rai’s family where they conduct trials to demonstrate the importance and feasibility of different agri-practices and compare yields at harvest. Rai, a champion farmer who has been involved with CSISA for nearly a decade, said, “I am a collaborator with CSISA now. The data gathered from my fields on the compounding benefits of conservation agriculture technologies is used to promote the best practices and technology adoption across our district and state.”
One village at a time
Presently, Rajapur village has 100% zero tillage adoption. Despite most farmers being smallholders, this level of zero tillage adoption in wheat is impressive. Zero-till-based crop establishment, with appropriate diversification in crops grown, is economically beneficial and improves soil health. All these practices and technologies ensure lower greenhouse emissions and support climate change mitigation efforts. Above all, smallholder farmers are food secure and contributing in their small way to national and global food security.
To scale the adoption of conservation agriculture practices, CSISA and partners are collaborating with farmers in the district/state – many of whom are already 50-80% in zero tillage adoption. The team on the ground are conducting system optimization trials on farmers’ fields to generate data and evidence to support and strengthen policies and assist in integrating market intelligence to support access and availability of technology to all smallholders. Every year steadily, through a smallholder farmer, a village, a district, the effort is to slowly expand the area under conservation agriculture across the state and region and ensure increased system productivity and sustainability of agriculture.
On August 29, CIMMYT held the latest installment of its seminar series on women’s leadership—Catalysts of Change: Women Leaders in Science. The online event featured a presentation from Lindiwe Majele Sibanda, an animal scientist by training, who has previously worked as policy advisor for numerous African governments and global institutions and currently serves as chair of the CGIAR System Board.
In her opening talk, Sibanda outlined the many and varied roles she has held throughout her career, including professor, farmer, and business owner. Discussing her early education in a segregated colonial Zimbabwe (then Rhodesia), her time as an undergraduate student in Egypt, or the challenge of starting a family alongside developing her career, Sibanda was keen to highlight the lessons learned at each stage of life and emphasized the importance of creating cross-cultural friendships, nurturing professional networks, establishing priorities, and promoting continuous learning.
A learning spirit
Sibanda has over 15 years of experience working as a governor at national, regional, and international levels, but it took some time to initially build her confidence in the role. She recalled feeling daunted during her very first meetings because she had not been trained, but her learning spirit helped carry her through. “I always looked around the room and chose my mentors—based on something I liked about their values—something I liked about the way they asked questions, or something I liked about their demeanor and how they engaged with others—and I started learning.”
This approach has garnered her a large circle of mentors—and friends—and having served on more than 12 different boards she now feels this is a space that she enjoys, particularly as there are still opportunities for learning. “I think it’s the spirit of continuous thirst for knowledge, for new information, that has kept me going.”
“And it’s all about integrity,” she added. “What people see in me is what they get. I’ve never had to be fake. What I know, I make sure I know very well. What I don’t know, I’m not shy to say I don’t know.”
Convince each other that it can be done
Having unpacked her life as a scholar, mother, working professional, and governor, Sibanda explained that her current focus is on giving back. For her, supporting the next generation of women in the workplace is a key part of leadership. She cited Graça Machel and Mama Mary Robinson as inspirations, both for their work ethic and their ability to connect with people at different levels. “But most importantly, they give it to other women,” she said. “They love mentoring girls and other women.”
In her own experience, some of the major obstacles she faces as a woman, a farmer, and an African are the specific biases associated with each of those three things. “Women need to be helped, they are disadvantaged; farmers are poor, especially if they come from Africa; and mothers need to spend more time at home and not be globetrotting to meetings.” To counter these biases, she explained, it is important to show that you can thrive and excel in all environments. “It’s not about either or, it’s about showing we can do it, regardless of the circumstances.”
“Women are natural agents of change, and all they need is a conducive environment. As women, we should be spending more time with other women, making sure we share our stories, our successes, and our struggles. The whole idea is to convince each other that it can be done.”
Sibanda’s presentation was followed by a Q&A session led by Ana Luisa Garcia Rivera, senior regional genotyping coordinator at CIMMYT. Watch the recorded session below.
The introduction of mechanisation in agricultural practices has ensured the promotion of technology and conservation of agriculture to stimulate smallholder production and the preservation of climate-proofing farming practices in Zimbabwe.
CIMMYT hosted a meeting, to discuss how the HAFIZ project has set the foundation for harnessing farm mechanization in Zimbabwe, shaping the future of mechanisation policies and interventions in Zimbabwe. As well as future initiatives to improve technology to sustain growth and master the impact of climate change.
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How many times have we seen innovative ideas launched into the marketplace, seeming to offer answers to key problems, only to see them fail to make the impact that we expected? In the modern world, having a great idea is not enough to ensure market success. Even when new products, processes or technologies have been carefully and successfully tested in trials and studies, the process of scaling and launching them often leads to disappointing results.
History of the Scaling Scan
“The Scaling Scan is a necessary breakthrough for those connected with meaningful impact. The Scaling Scan is accessible, practical, grounded in the reality, and most importantly, a watershed rethinking the ‘bigger is better’ logic of scaling.”
Rob McLean, CIMMYT scaling coordinator senior program specialist in Policy and Evaluation at IDRC and author of “Scaling Impact”
The Scaling Scan was developed to improve this process and ensure that new innovations have the best chance of success. Traditionally, scaling an innovation has often resulted in “linear” thinking, where the project team focuses on the advantages of their new product and relies on these for launch. The Scaling Scan encourages teams to broaden their thinking into areas within the overall private and public sector environments where they may have less experience, but which can greatly help or hinder the success of new ideas. It looks at 10 “ingredients” to consider, discuss, and develop strategies to address — ranging from end-user financing and business cases to national strategies and regulations.
The first version of the Scaling Scan was launched in 2017 following cooperation between scaling expert Lennart Woltering at CIMMYT and the Public Private Partnership Lab (PPPLab), a research consortium based in the Netherlands. A second, updated version was released the following year. The tool has been implemented through workshops held around the world, with trained moderators to encourage discussion, share ideas and develop expertise. These discussions resulted in five action steps:
More than 1,200 participants attended the workshops that were held in English, Spanish and French. Half of the workshops were held in Africa, with the rest divided between Asia and North and South America, including 11 in Mexico. In 2022, an online version was made available through the launch of a new website, https://scalingscan.org/ with support from the Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) and the One CGIAR Mitigate initiative. This has further increased the availability of and access to scaling information.
“The Scaling Scan pushes users to go beyond a narrow focus on scaling an innovation. It is a great tool that enables practical thinking about the multiple pathways to impact at scale and the range of stakeholders that need to be considered in scaling process.”
Kelly Hayley Price, DRC senior evaluation officer
3rd edition Scaling Scan Launch
On September 14, 2023, the 3rd edition of the Scaling Scan will be launched. With the support of GIZ, FAO, Alliance, and SNV, the tool has been enhanced to include some changes inspired by discussions at the workshops. There is increased consideration of gender roles and how these might affect, or be affected by, a scaling program. Likewise, the impact of climate change is also included. In terms of usability, the Scaling Scan has been adapted to make it more accessible to use without a moderator, meaning that users will be able to benefit even if they have difficulty getting to a workshop. It has also been designed to make it easier to customize the Scaling Scan to fit one’s own needs, rather than requiring the standard version used in workshops.
To find out more about the Scaling Scan, please visit https://scalingscan.org/, or email e.valencia@cgiar.org for more information.
The widespread availability of chemical nitrogen fertilizers is a prime driver of the vast improvement of crop yields over the past 50 years. However, their use has come with a price, as nitrogen escaping into surrounding soil and air has negative impacts on the environment and human health, including water pollution, depletion of soil-fertility, and greenhouse gas emissions.
Researchers from CIMMYT and JIRCAS (Japan International Research Center for Agricultural Science) examined ways to curtail the leakage of nitrogen into ecosystems, through a process called biological nitrification inhibition (BNI) in the paper “Genetic variation among elite inbred lines suggests potential to breed for BNI-capacity in maize,” published in the journal Scientific Reports on August 17, 2023.
BNI is a plant-based natural process that reduces nitrogen losses, which can reduce fertilizer demand while sustaining agricultural systems. The roots of plants that exhibit BNI activity release natural substances that inhibit the activity of nitrifying bacteria in soil, thus reducing the amount of nitrogen lost to the surrounding ecosystem. Many plant species have natural BNI activity in their roots.
Although synthetic chemical nitrification inhibitors are commercially available to reduce nitrogen losses, the high costs of this approach have limited its adoption. By contrast, breeding new varieties with increased natural BNI activity can offer a practical and economical approach to reduce nitrogen fertilizer need and waste.
“We are in the discovery phase regarding BNI activity and its determining traits for maize. Such information is crucial to pave the way for breeding programs and genetic improvement efforts,” said Kevin Pixley, co-author of the paper and former director of CIMMYT’s Genetic Resources Program. “We need to identify genetic markers for BNI compounds including ‘zeanone’, which will enable breeders to develop maize varieties that require and waste less nitrogen fertilizer, while achieving high yields.”
This research identified 18 single nucleotide polymorphisms (SNP) that act as genetic “signposts” for breeders to use to accelerate and increase the accuracy of breeding to increase BNI activity for maize. The researchers also identified six “candidate” or putative genes associated with BNI activity and related to nitrogen use efficiency, thereby enhancing the understanding of the genetics controlling BNI activity.
“Our identification of SNPs and genes that regulate how maize processes nitrogen begins to draw a road map to guide the development of molecular markers for use in breeding new maize varieties that meet farmer and consumer needs at a lower environmental cost,” said senior author Cesar Petroli. “Building on the results obtained and reported in our recent publication, we are developing maize (doubled haploid) populations to refine the genetic map for BNI activity in maize”.
This research was conducted with partners from JIRCAS and the Universidad de la República, Uruguay.