This four-year Maize Lethal Necrosis Diagnostics and Prevention of Seed Transmission project will coordinate regional efforts to strengthen response to the rapid emergence and spread of Maize Lethal Necrosis (MLN).
Coordinated by CIMMYT, it will establish a community of practice among national plant protection organizations in eastern Africa for implementing harmonized MLN diagnostic protocols for detecting MLN-causing viruses and enable commercial seed companies to implement necessary standard operational procedures to produce MLN-free clean seed at various points along the maize seed value chain. It will also step-up MLN surveillance and monitoring in Malawi, Zambia and Zimbabwe, three of the major commercial maize seed exporting countries in sub-Saharan Africa.
The MLN project will be implemented in close partnership with the Alliance for a Green Revolution in Africa, the African Agricultural Technology Foundation, national plant protection organizations and commercial seed companies in eastern Africa. It will also pool expertise from relevant public- and private-sector partners, regional organizations, and seed trade organizations operating in the region.
Partners: The Alliance for a Green Revolution in Africa, the African Agricultural Technology Foundation, national plant protection organizations and commercial seed companies in eastern Africa
The Sustainable Intensification of Maize-Legume Systems for Food Security in Eastern and Southern Africa (SIMLESA) program aims to improve maize and legume productivity by 30 percent and to reduce the expected downside yield risk by 30 percent on approximately on approximately 650,000 farm households by 2023. Launched in 2010, the focal countries of program research are Australia, Botswana, Burundi, Ethiopia, Kenya, Malawi, Mozambique, Tanzania, South Sudan, Uganda, Rwanda, Zambia and Zimbabwe.
The main thrust of the SIMLESA program is increasing farm-level food security, productivity and incomes through promotion of maize-legume intercropping systems in the context of reduced climate risk and change.
The program has also laid the foundation for developing conservation agriculture based sustainable intensification options, including integration of improved maize and legume varieties identified for their compatibility with CA-based practices; promoting technology adoption by both female and male farmers; capacity building for national agricultural research systems of partner countries; creating enhanced partnerships and collaboration with established innovation platforms for coordinated scaling-out of SIMLESA-generated options and practices.
Funding Institutions: Australian Centre for International Agricultural Research (ACIAR)
Partners: National agricultural systems of Ethiopia, Kenya, Malawi, Mozambique and Tanzania, as well as international and local research centers, extension agencies, non-governmental organizations, universities and agribusinesses along the value chain.
This project will lead to the identification of genes of interest to help guide breeding efforts to boost yield stability and resilience in low fertility agriculture systems subject to drought.
The Stress Tolerant Maize for Africa (STMA) project aims to diminish devastating constraints in maize production across sub-Saharan Africa. The project develops improved maize varieties with resistance and tolerance to drought, low soil fertility, heat, diseases such as Maize Lethal Necrosis and pests affecting maize production areas in the region.
STMA operates in eastern (Ethiopia, Kenya, Tanzania, Uganda), southern (Malawi, South Africa, Zambia, Zimbabwe) and West Africa (Benin, Ghana, Mali, Nigeria). These countries account for nearly 72 percent of all maize area in sub-Saharan Africa and include more than 176 million people who depend on maize-based agriculture for their food security and economic well-being. Climate change effects like drought, a lack of access to resources like fertilizer and other stresses increase the risk of crop failure that negatively affects income, food security and nutrition of millions of smallholder farmers and their families.
The project will develop 70 new stress-tolerant varieties using innovative modern breeding technologies, and promote improved stress-tolerant varieties expected to increase maize productivity up to 50 percent. The project aims to produce estimated 54,000 tons of certified seed to put into the hands of more than 5.4 million smallholder farmer households by the end of 2019.
Objectives
Use innovative breeding tools and techniques applied for increasing the rate of genetic gain in the maize breeding pipeline.
Increase commercialization of improved multiple-stress-tolerant maize varieties with gender-preferred traits by the sub-Saharan African seed sector.
Increase seed availability and farmer uptake of stress-tolerant maize varieties in target countries.
Optimize investment impact through effective project oversight, monitoring, evaluation and communication.
The Drought Tolerant Maize for Africa project aims to mitigate drought and other constraints to maize production in sub-Saharan Africa, increasing maize yields by at least one ton per hectare under moderate drought and with a 20 to 30 percent increase over farmers’ current yields, benefiting up to 40 million people in 13 African countries. The project brings together farmers, research institutions, extension specialists, seed producers, farmer community organizations and non-governmental organizations. It is jointly implemented by CIMMYT and the International Institute for Tropical Agriculture, in close collaboration with national agricultural research systems in participating nations. Millions of farmers in the region are already benefiting from the outputs of this partnership, which includes support and training for African seed producers and promoting vibrant, competitive seed markets.
Achievements:
Between 2007 and 12, participants marketed or otherwise made available 60 drought tolerant hybrids and 57 open-pollinated varieties to smallholder farmers
In addition to drought tolerance, the new varieties and hybrids also possess such desirable traits as resistance to major diseases
Engage government officials in policy dialogue to help fast-track varietal releases and fosters competitive seed markets and more
widespread access to quality seed at affordable prices
Help ensure farmers’ access to the best possible products and services, coordinate various capacity-building events and
activities for maize breeders, technicians, seed producers, extension workers, non-government organizations and farmer groups
Provide technical and advisory support to 50 African undergraduate and 28 African graduate students
Expand smallholder farmers’ use of drought and other stress tolerant maize seed to benefit 30 to 40 million people and provide added grain worth $160-200 million each year in drought-affected areas of sub-Saharan Africa
Tabitha Kamau checks the maize at her family’s farm in Machakos County, Kenya. (Photo: Joshua Masinde/CIMMYT)
How do young rural Africans engage in the rural economy? How important is farming relative to non-farm activities for the income of young rural Africans? What social, spatial and policy factors explain different patterns of engagement? These questions are at the heart of an interdisciplinary research project, funded by the International Fund for Agricultural Development (IFAD), that seeks to provide stronger evidence for policy and for the growing number of programs in Africa that want to “invest in youth.”
One component of the Challenges and Opportunities for Rural Youth Employment in Sub-Saharan Africa project, led by the Institute of Development Studies (IDS), draws on data from the World Bank’s Living Standard Measurement Study – Integrated Surveys on Agriculture (LSMS-ISA) to develop a more detailed picture of young people’s economic activities. These surveys, covering eight countries in sub-Saharan Africa, were conducted at regular intervals and in most cases followed the same households and individuals through time. While the LSMS-ISA are not specialized youth surveys and therefore may not cover all facets of youth livelihoods and wellbeing in detail, they provide valuable knowledge about the evolving patterns of social and economic characteristics of rural African youth and their households.
“LSMS-ISA data are open access, aiming to help national governments and academics analyze the linkages between poverty and agricultural productivity in developing countries,” said Sydney Gourlay, Survey Specialist in the Development Data Group of the World Bank. She explained that LSMS-ISA datasets cover rural and urban livelihoods — including asset ownership, education, farm and non-farm incomes — and contain detailed information on farming practices and productivity. “LSMS-ISA data have untapped potential for valuable youth analyses that could lead to evidence-based youth policy reform,” Gourlay said.
To stimulate greater use of LSMS-ISA data for research on these issues, the International Maize and Wheat Improvement Center (CIMMYT), IDS, and the LSMS team of the World Bank organized a workshop for young African social scientists, hosted by CIMMYT in Nairobi from February 4 to February 8, 2019.
Early-career social scientists from Ethiopia, Ghana, Kenya, Nigeria, Uganda, and Zimbabwe explored the potential of LSMS-ISA data, identified research issues, and developed strategies to create new analyses. The workshop was also a chance to uncover potential areas for increased data collection on youth, as part of the LSMS team’s IFAD-funded initiative “Improving Data on Women and Youth.”
What does that data point represent?
The workshop stressed the importance of getting to know the data before analyzing them. As explained by World Bank senior economist Talip Kilic in The Crowd and the Cloud, “Every data point has a human story.” It is important to decipher what the data points represent and the limits within which they can be interpreted. For instance, the definition of youth differs by country, so comparative studies across countries must harmonize data from different sources.
“Because LSMS-ISA survey locations are georeferenced, it is possible to integrate spatial information from multiple sources and gain new insights about patterns of interest, as well as the drivers associated with such patterns,” said Jordan Chamberlin, spatial economics expert at CIMMYT. “For example, in all countries we’ve examined, the degree of non-farm economic engagement is strongly associated with distance from urban centers.”
Chamberlin noted that georeferencing also has limitations. For instance, to ensure privacy, LSMS-ISA coordinates for households are randomly offset by as much as 5 km. Nonetheless, diverse geospatial data from the datasets — distance to the nearest tarmac road or population density, among other information — may be integrated via the location coordinates.
A young farmer holding a baby participates in a varietal assessment exercise on a maize trial plot in Machakos County, Kenya. (Photo: Joshua Masinde/CIMMYT)
One key variable to assess farm productivity is harvested area. The LSMS team’s research has revealed high, systematic discrepancies between farmers’ self-assessments of area, GPS measurements, and compass and rope, which is considered the most accurate method. Methodological validation data from Ethiopia, Nigeria, and Tanzania show that on average farmers overestimate the area of plots smaller than 200 m2 by more than 370 percent and underestimate the size of plots larger than 2 hectares by 13 percent, relative to compass and rope measurements. Such errors can skew yield analyses and the accuracy of assessments of national agricultural research programs’ impact.
Several workshop participants expressed interest in using the LSMS dataset for studies on migration, given that it contains information about this variable. In the case of internal migrants — that is, persons who have moved to another area in the same country — LSMS enumerators will find and interview them and these migrants will continue to be included in future rounds of the panel survey. In Malawi, for example, about 93 percent of individuals were tracked between the 2010/11 and the 2013 Integrated Household Surveys. Plot characteristics — such as type of soil, input use, and crop production — include information on the person who manages the plot, allowing for identification and analysis of male and female managed plots.
Following the training, the participants have better articulated their research ideas on youth. Prospective youth studies from the group include how land productivity affects youth opportunities and whether migration induces greater involvement of women in agriculture or raises the cost of rural labor. Better studies will generate more accurate knowledge to help design more effective youth policies.
Mainassara Zaman-Allah conducts a demonstration of the use of unmanned aerial vehicles (UAV) at the Chiredzi research station in Zimbabwe.
To keep up with growing maize demand, breeders aim at optimizing annual yield gain under various stress conditions, like drought or low fertility soils. To that end, they identify the genetic merit of each individual plant, so they can select the best ones for breeding.
To improve that process, researchers at the International Maize and Wheat Improvement Center (CIMMYT) are looking at cost-effective ways to assess a larger number of maize plants and to collect more accurate data related to key plant characteristics. Plant phenotyping looks at the interaction between the genetic make-up of a plant with the environment, which produces certain characteristics or traits. In maize, for example, this may manifest in different leaf angles or ear heights.
Recent innovations in digital imagery and sensors save money and time in the collection of data related to phenotyping. These technologies, known as high-throughput phenotyping platforms, replace lengthy paper-based visual observations of crop trials.
Authors of a recent review study on high-throughput phenotyping tools observe that obtaining accurate and inexpensive estimates of genetic value of individuals is central to breeding. Mainassara Zaman-Allah, an abiotic stress phenotyping specialist at CIMMYT in Zimbabwe and one of the co-authors, emphasizes the importance of improving existing tools and developing new ones. “Plant breeding is a continuously evolving field where new tools and methods are used to develop new varieties more precisely and rapidly, sometimes at reduced financial resources than before,” he said. “All this happens to improve efficiency in breeding, in order to address the need for faster genetic gain and reduction of the cost of breeding.”
“Under the Stress Tolerant Maize for Africa (STMA) project, we are working on implementing the use of drone-based sensing, among other breeding innovations, to reduce time and cost of phenotyping, so that the development of new varieties costs less,’’ said Zaman-Allah. “The use of drones cuts time and cost of data collection by 25 to 75 percent compared to conventional methods, because it enables to collect data on several traits simultaneously — for example canopy senescence and plant count,” he explained.
Another great innovation developed under this CIMMYT project is what Zaman-Allah calls the ear analyzer. This low-cost digital imaging app allows to collect maize ear and kernel trait data 90 percent faster. This implies higher productivity and rigor, as more time is dedicated to data analysis rather than time spent on data collection. Using digital image processing, the ear analyzer gives simultaneous data of more than eight traits, including ear size and number, kernel number, size and weight.
Measuring maize attributes such as ear size, kernel number and kernel weight is becoming faster and simpler through digital imaging technologies.
Scientists are exploring the use of different sensors for phenotyping, such as Red, Green and Blue (RGB) digital imaging or Light Detection and Ranging (LIDAR) devices. Infrared thermal and spectral cameras could lead to further progress towards faster maize breeding.
Such sensors can help collect numerous proxy data relating to important plant physiological traits or the plant environment, like plant height and architecture, soil moisture and root characteristics. This data can be used to assess the maize crop yield potential and stress tolerance.
Such breeding innovations are also making maize research more responsive to climate change and emerging pests and diseases.
Face of an adult male Phidippus audax male jumping spider. (Photo: Opoterser/Wikimedia Commons)
A new study explores how conservation agriculture in southern Africa supports spider populations and diversity in fields, which could help mitigate pest damage and potentially lead to higher yields for farmers. According to the Food and Agriculture Organization of the United Nations (FAO), herbivorous insects such as aphids, caterpillars and weevils destroy about one fifth of the world’s total crop production each year. Spiders can help keep voracious pests in-check, but conventional farming practices (e.g. tilling, crop residue removal and monoculture) can harm or drastically reduce these beneficial bio-control agents.
There are more than 45,000 identified spider species around the world. From glaciers to tropical rainforests, they inhabit every terrestrial ecosystem on earth. Some can even live in tidal zones, and at least one species inhabits fresh water. While we tend to associate spiders with webs, only about 50 percent of the species catch their prey this way; the rest hunt on plants, on the ground or below it, using a variety of tactics such as stalking, stabbing, crushing – even seduction.
Although spiders have been around for 300 million years, some species are at risk of extinction due to habitat loss and fragmentation. Drastic reductions in vegetation – whether from a new parking lot or a tilled field – removes the food source that attracts their prey. Bare ground exposes their nesting sites and themselves, which makes it harder to hunt and easier to be hunted by birds and small mammals.
At the Chinhoyi University of Technology experimental farm in Zimbabwe, a team of researchers aimed to determine the response of spiders under different agricultural practices. Conventional farmers often prepare their fields for planting by physically breaking up and inverting the top 6-10 inches of soil. This practice of ploughing prepares a fine soil tilth, which makes it easier to plant; it breaks up and buries weeds, and reduces soil compaction to aerate the soil. But tilling also increases topsoil erosion from wind and water. It accelerates soil carbon decomposition, reduces soil water infiltration and disrupts microorganisms living in the soil, including beneficial insects and spiders.
The researchers conducted two experiments over the 2013/2014 and 2014/2015 cropping seasons to see how tilling, crop residue retention (i.e. leaving stalks and post-harvest organic matter in the field), fertilizer application and weeding affected ground- and plant-wandering spider species. They hypothesized that spider abundance and diversity would increase with lower levels of soil disturbance and more plant cover.
The results showed direct seeding into no-till soil increased the abundance of spiders and the diversity of species. Mulching also showed a positive effect. Contrary to their hypotheses and results from temperate regions, the application of fertilizer and intense weeding did not affect the spider community. The researchers attributed this to the difference in climatic conditions (tropical vs. temperate) of this study in southern Africa.
“Often the government’s and farmer’s immediate reaction to a crop pest issue is to apply a pesticide, but we can make use of biological control agents, which may be cheaper and less damaging for the environment,” says Christian Thierfelder, a co-author of the study. Thierfelder is a cropping systems agronomist and conservation agriculture specialist with the International Maize and Wheat Improvement Center (CIMMYT) with long-term experience in sustainable intensification.
“Spiders, ants and beetles all do a really good job with little or no cost to the farmer,” he adds. “For us, it’s quite fascinating to see simple agronomic practices to affect and control crop pests. This also provides new avenues of dealing with the fall armyworm, an invasive species which has devastated crops across the majority of sub-Saharan Africa countries.”
A robust number of studies from Europe, Australia and North America have shown the link between conservation agriculture and biodiversity, but Thierfelder says that research on biodiversity in agronomic systems is relatively new in southern Africa. While the study in Zimbabwe helps fill this gap, more research is needed to show the connection between the abundance of spiders, beetles and ants with the suppression of insect pest activity.
This research was jointly funded by Chinhoyi University of Technology (CUT) and the German Academic Exchange Program (DAAD). The CGIAR Research Program on Maize (MAIZE) supported this study through Christian Thierfelder’s contributions.
Support for smallholder farmers to trial and select sustainable practices suited to their varying conditions is essential to build resilient farms needed to feed Africa’s soaring population, said economist Paswel Marenya at the Second African Congress on Conservation Agriculture in Johannesburg this October.
Farmers face different agroecological, socioeconomic and institutional environments across Africa. The mounting challenges brought by climate change also vary from place to place. Family farmers are born innovators, with government and industry support they can develop a resilient farming system that works for them, said the researcher from the International Maize and Wheat Improvement Center (CIMMYT).
One of the emerging paradigms of sustainable agriculture resilient to climatic changes is conservation agriculture — defined by minimal soil disturbance, crop residue retention and diversification through crop rotation. Although not a one-size-fits-all approach, it is a promising framework to be applied and adapted to meet farmers’ unique contexts, he said.
“Conservation agriculture’s potential to conserve soils, improve yields and limit environmental impacts makes it one of the elements that should be given prominence in efforts to secure sustainable and resilient farming in Africa,” he told audiences at the conference dedicated to discuss conservation agriculture systems as the sustainable basis for regional food security.
“Research shows that with a network of appropriate support, farmers can access the tools and knowledge to experiment, learn, adapt and adopt these important principles of conservation agriculture,” he said.
“Their farming can thus evolve to practices that have low environmental impacts, diversify their cropping including intercropping maize with legumes, and test affordable machinery for efficient, timely and labor-saving operations. In the end, each farmer and farming community have the ability to tailor a conservation agriculture-based system based on what works best given their unique socioeconomic settings,” said Marenya.
Trialing sustainable practices leads to adoption
Through the project over 235,000 farming households in the region have trialed sustainable practices reporting positive results of improved soil fertility, reduced labor costs, and increased food production and maize yields despite erratic weather, said collaborating investigator Custudio George from the Mozambique Institute of Agricultural Research.
“The majority of these farmers have gone on to adopt their preferred practices throughout their whole farm and now actively promote conservation agriculture to other farmers,” he added
Women undertake the majority of agricultural activities in sub-Saharan Africa. When they are empowered to try sustainable practices they overwhelmingly adopt those technologies identifying them as an economically viable way to overcome challenges and increase household food security, said Maria da Luz Quinhentos, who is an agronomist with the Mozambique Institute of Agricultural Research.
Maria da Luz Quinhentos, from the Mozambique Institute of Agricultural Research (IIAM).
Forming networks to support farmer resilience
The research project took a multidisciplinary approach bringing together sociologists, economists, agronomists and breeders to study how maize-legume conservation agriculture-based farming can best benefit farmers in seven countries; including Ethiopia, Kenya, Malawi, Mozambique, Tanzania and Uganda.
In this vein, the project sought to connect farmers with multi-sector actors across the maize-legume value chain through Innovation platforms. Innovation Platforms, facilitated by SIMLESA, are multi-stakeholder forums connecting farmer groups, agribusiness, government extension, policy makers and researchers with the common goal to increase farm-level food security, productivity and incomes through the promotion of maize-legume intercropping systems.
“Having a network of stakeholders allows farmers to test and adopt conservation agriculture-based techniques without the risk they would have if they tried and failed alone,” said Michael Misiko who studies farmer adoption as part of SIMLESA.
“Farmers form groups to work with governments to gain access to improved seed, learn new farming practices and connect with local agribusinesses to develop markets for their produce,”
“When new problems arise stakeholders in local and regional innovation platforms can diagnose barriers and together identify mutual solutions,” he said.
Researchers and governments learn from innovation platforms and can use results to recommend productive climate-smart practices to other farmers in similar conditions, Misiko added.
Climate-smart agriculture key to achieve Malabo Declaration
The results from SIMLESA provide African governments with evidence to develop policies that achieve the Malabo Declaration to implement resilient farming systems to enhance food security in the face of a growing climate risks, said Marenya.
If these smallholders are to keep up with food demand of a population set to almost double by 2050 while overcoming challenges they need productive and climate-resilient cropping systems.
CIMMYT research identifies that the defining principles of conservation agriculture are critical but alone are not enough to shield farmers from the impacts of climate change. Complementary improvements in economic policies, markets and institutions — including multi-sectoral linkages between smallholder agriculture and the broader economy — are required to make climate-resilient farming systems more functional for smallholder farmers in the short and long term, said Marenya.
Farmer Eveline Musafari intercrops maize and a variety of legumes on her entire farm. She likes the ability to grow different food crops on the same space, providing her family with more food to eat and sell. (Photo: Matthew O’Leary/CIMMYT)
Honest Musafari, a fifty-year-old farmer from rural Zimbabwe, eagerly picks up a clump of soil from his recently harvested field to show how dark and fertile it is. A farmer all his life, Musafari explains the soil has not always been like this. For years, he and his neighbors had to deal with poor eroding soil that increasingly dampened maize yields.
“My soil was getting poorer each time I plowed my field, but since I stopped plowing, left the crop residues and planted maize together with legumes the soil is much healthier,” says Musafari. His 1.6-hectare maize-based farm, in the Murehwa district, supports his family of six.
For over two years, Musafari has been one of the ten farmers in this hot and dry area of Zimbabwe to trial intercropping legumes and green manure cover crops alongside their maize, to assess their impact on soil fertility.
The on-farm trials are part of efforts led by the International Maize and Wheat Improvement Center (CIMMYT) in collaboration with Catholic Relief Services (CRS) and government extension services to promote climate-resilient cropping systems in sub-Saharan Africa.
Increasing land degradation at the farm and landscape level is the major limitation to food security and livelihoods for smallholder farmers in sub-Saharan Africa, says CIMMYT senior cropping systems agronomist Christian Thierfelder.
“Over 65 percent of soils in Africa are degraded. They lack the nutrients needed for productive crops. This is a major part of the reason why the region’s maize yields are not increasing,” he explains. “The failure to address poor soil health will have a disastrous effect on feeding the region’s growing population.”
The area where Musafari lives was chosen to test intercropping, along with others in Malawi and Zambia, for their infamous poor soils.
Mixing it up
When legumes are intercropped with maize they act as a green manure adding nutrients to the soil through nitrogen fixation. Intercropping legumes and cereals along with the principles of conservation agriculture are considered away to sustainable intensify food production in Africa. (Photo: Christian Thierfelder/CIMMYT)
Planted in proximity to maize, legumes — like pigeon pea, lablab and jack beans — add nitrogen to the soil, acting as green manure as they grow, says Thierfelder. Essentially, they replace the nutrients being used by the cereal plant and are an accessible form of fertilizer for farmers who cannot afford mineral fertilizers to improve soil fertility.
“Our trials show legumes are a win for resource poor family farmers. Providing potentially 5 to 50 tons per hectare of extra organic matter besides ground cover and fodder,” he notes. “They leave 50 to 350 kg per hectare of residual nitrogen in the soil and do not need extra fertilizer to grow.”
Added to the principles of conservation agriculture — defined by minimal soil disturbance, crop residue retention and diversification through crop rotation and intercropping — farmers are well on their way to building a resilient farm system, says Geoffrey Heinrich, a senior technical advisor for agriculture with CRS working to promote farmer adoption of green manure cover crops.
For years Musafari, as many other smallholder farmers in Africa, tilled the land to prepare it for planting, using plows to mix weeds and crop residues back into the soil. However, this intensive digging has damaged soil structure, destroyed most of the organic matter, reduced its ability to hold moisture and caused wind and water erosion.
Letting the plants do the work
Growing legumes alongside maize provides immediate benefits, such as reduced weeding labor and legume cash crops farmers can sell for a quick income. The legumes also improve the nitrogen levels in the soil and can save farmers money, as maize needs less fertilizer. (Photo: Christian Thierfelder/CIMMYT)
Musafari says the high price of mineral fertilizer puts it out of reach for farmers in his community. They only buy little amounts when they have spare cash, which is never enough to get its full benefit.
He was at first skeptical green manure cover crops could improve the quality of his soil or maize yields, he explains. However, he thought it was worth a try, considering growing different crops on the same plot would provide his family with more food and the opportunity to make some extra cash.
“I’m glad I tried intercropping. Every legume I intercropped with my maize improved the soil structure, its ability to capture rain water and also improved the health of my maize,” he says.
Thierfelder describes how this happens. Nitrogen fixation, which is unique to leguminous crops, is a very important process for improving soil fertility. This process involves bacteria in the soil and nitrogen in the air. The bacteria form small growths on the plant roots, called nodules, and capture the atmospheric nitrogen as it enters the soil. The nodules change the nitrogen into ammonia, a form of nitrogen plants use to produce protein.
In addition, legumes grown as a cover crop keep soil protected from heavy rains and strong winds and their roots hold the soil in place, the agronomist explains. They conserve soil moisture, suppress weeds and provide fodder for animals and new sources of food for consumption or sale.
Farmers embrace intercropping
Extension worker Memory Chipinguzi explains the benefits of intercropping legumes with cereals to farmers at a field day in the Murehwa district, Zimbabwe. (Photo: Christian Thierfelder/CIMMYT)
Working with CIMMYT, Musafari and his wife divided a part of their farm into eight 20 by 10 meter plots. On each plot, they intercropped maize with a different legume: cowpea, jack bean, lablab, pigeon pea, sugar bean and velvet bean. They also tried intercropping with two legumes on one of the plots. Then they compared all those options to growing maize alone.
“Season by season the soil on each of the trial plots has got darker and my maize healthier,” describes Musafari. “Rains used to come and wash away the soil, but now we don’t plow or dig holes, so the soil is not being washed away; it holds the water.”
“I really like how the legumes have reduced the weeds. Before we had a major problem with witchweed, which is common in poor soils, but now it’s gone,” he adds.
Since the first season of the trial, Musafari’s maize yields have almost tripled. The first season his maize harvested 11 bags, or half a ton, and two seasons later it has increased to 32 bags, or 1.5 tons.
Musafari’s wife Eveline has also been convinced about the benefits of intercropping, expressing the family now wants to extend it to the whole farm. “Intercropping has more advantages than just growing maize. We get different types of food on the same space. We have more to eat and more to sell,” she says.
The family prefers intercropping with jack bean and lablab. Even though they were among the hardest legumes to sell, they improved the soil the most. They also mature at the same time as their maize, so they save labor as they only have to harvest once.
The benefits gained during intercropping have influenced farmers to adopt it as part of their farming practices at most of our trial sites across southern Africa, CRS’s Heinrich says.
“Immediate benefits, such as reduced weeding labor and legume cash crops that farmers can sell off quick, provide a good incentive for adoption,” he adds.
Honest and Eveline Musafari with extension worker, Memory Chipinguzi. Neighbors have noticed the intercropping trials on the Musafari’s farm and are beginning to adopt the practice to gain similar benefits. (Photo: Matthew O’Leary/CIMMYT)
The majority of African farmers are smallholders who cultivate less than 2 hectares, explains Thierfelder. If they are to meet the food demand of a population set to almost double by 2050, bringing it to over 2 billion people while overcoming multiple challenges, they need much more productive and climate-resilient cropping systems.
New research identifies that the defining principles of conservation agriculture alone are not enough to shield farmers from the impacts of climate change. Complementary practices are required to make climate-resilient farming systems more functional for smallholder farmers in the short and long term, he warns.
“Intercropping with legumes is one complementary practice which can help building healthy soils that stand up to erratic weather,” says Thierfelder. “CIMMYT promotes climate-resilient cropping systems that are tailored to farmers’ needs,” he emphasizes.
“To sustainably intensify farms, growers need to implement a variety of options including intercropping, using improved crop varieties resistant to heat and drought and efficient planting using mechanization along with the principles of conservation agriculture to obtain the best results.”
While traveling through Africa and stopping at CIMMYT’s regional offices, I had the pleasure of meeting the President of Zimbabwe, Emmerson Mnangagwa, and discussing ways of enhancing agricultural productivity in the face of erratic rains expected in the 2018-19 farming season.
CIMMYT’s director general Martin Kropff (right) greets the president of Zimbabwe, Emmerson Mnangagwa, at Munhumutapa Offices in Harare. (Picture by Tawanda Mudimu)
After receiving training from CIMMYT, this group of young men started a small business offering mechanized agricultural services to smallholder farmers near their town in rural Zimbabwe. (Photo: Matthew O’Leary/CIMMYT)
The sound of an engine roars as Gift Chawara, a 28-year-old from rural Zimbabwe, carefully removes a mesh bag bulging with maize grain hooked to his mechanized sheller. Fed with dried maize cobs, the sheller separates the grain from the shaft before shooting the kernels out the side into the awaiting bag. Chawara swiftly replaces the full bag with an empty one as the kernels continue to spill out.
It is eleven in the morning and the sun beats down over the small farm. Chawara and his friends have only been working a few hours and have already shelled 7 tons for their neighbor and customer Loveness Karimuno; thirteen more tons to go.
The widowed farmer watches as the bags of grain line up, ready for her to take to market. It used to take Karimuno two to three weeks to shell her maize harvest by hand, even with the help of hired labor. This grueling task saw her rub each maize ear on a rough surface to remove the grain from the shaft. Now, these young men and their mechanized sheller will do it in just a few hours for a small fee.
“When my neighbor told me the boys were shelling small amounts of maize at reasonable prices, I got in contact with them,” said Karimuno. “It’s cheaper than hiring people to help me do it manually and the speed means I can sell it faster.”
It used to take widowed farmer Loveness Karimuno (left) two or three weeks to shell her 20-ton maize harvest manually, even with the help of hired labor. Using mechanization services, all of her maize is shelled within a day, meaning she can take her grain to market faster. (Photo: Matthew O’Leary/CIMMYT)
The group of young entrepreneurs is serving almost 150 family farms around the village of Mwanga, located about two hours northwest of the capital Harare. They offer services such as shelling and planting, powered by special machinery. Since Chawara and his partners started the business three years ago, word has spread and now they are struggling to keep up with demand, he expressed.
Mechanized agricultural services have traditionally only been used by large-scale farmers who could afford the high prices, but small and medium-sized machines are fast becoming affordable options for family farmers through the advent of service providers, explained Frédéric Baudron, an agronomist with the International Maize and Wheat Improvement Center (CIMMYT).
The five young men are among the increasing number of youth across eastern and southern Africa creating a stable living as entrepreneurs in agricultural mechanization service provision, Baudron said.
Tired of the lack of profitable work in their rural community, the group of youths jumped on the opportunity to join a training on agricultural mechanization, run by CIMMYT. They heard about this training through local extension workers.
“We would probably be out of work if we hadn’t had the opportunity to learn how agricultural mechanization can be used to help smallholder farmers and gain skills to run our own business to provide these services,” Chawara expressed as he took a quick rest from shelling under a tree.
“It has really changed our lives. Last season we shelled over 300 tons of maize making just under US $7,000,” he said. “It has gone a long way in helping us support our families and invest back into our business.”
Masimba Mawire, 30, and Gift Chawara, 28, take a break from shelling and rest under a tree. The small car behind was bought by Chawara with his profits earned from the mechanization service business. (Photo: Matthew O’Leary/CIMMYT)
Chawara and his partners attended one of these trainings, hosted on the grounds of an agricultural technical college on the outskirts of Harare. For a week, they participated in practical courses led by local agriculture and business experts.
As part of the CIMMYT research project, the youth group paid a commitment fee and were loaned a planter and sheller to start their business, which they are now paying off with their profits.
Youth tend to be better at managing modern technologies and successfully take to service providing, said Baudron, who leads the FACASI project.
“We found consistently, in all countries where we work, that being a successful service provider is highly correlated to being young,” he highlighted. “However, other factors are also important, such as being entrepreneurial, educated, able to contribute to the cost of the machinery and preferably having an experience in similar businesses, particularly in mechanics.”
(From left to right) Shepard Kawiz, 24, gathers dried maize cobs into a bucket passing it to his brother Pinnot Karwizi, 26, who pours the maize into the sheller machine by feeding the hopper. The maize falls into the sheller’s barrel where high-speed rotation separates the grain from the cob. As the bare shafts are propelled out one side, Masimba Mawire, 30, is there to catch and dispose of them. Meanwhile, Gift Chawara, 28, is making sure a bag is securely hooked to the machine to collect the maize grain. (Photo: Matthew O’Leary/CIMMYT)
Mentoring and support are key to success
The young men operate like a well-oiled machine. Shepard Kawiz, 24, gathers dried maize cobs into a bucket and passes it to his brother Pinnot Karwizi, 26, who pours the maize into the sheller machine by feeding the hopper. The maize falls into the sheller’s barrel where high-speed rotation separates the grain from the cob. As bare shafts are propelled out one side, Masimba Mawire, 30, is there to catch and dispose of them. Meanwhile, Gift Chawara is making sure a bag is securely hooked to the machine to collect the maize grain.
Trials showed that when youth form a group and are provided guidance they are more inclined to succeed as service providers, explained CIMMYT agribusiness development specialist Dorcas Matangi.
“The group model works because they share the costs, the workload and they are more attractive to lenders when looking for investment capital,” she remarked.
Throughout the season, Mantangi works with local government extension workers and engineers from the University of Zimbabwe to mentor those starting out. They also organize meetings where service providers can gather to discuss challenges and opportunities.
“This is a good opportunity to iron out any problems with the machines, connect them with mechanics and spare part providers and we gain their feedback to improve the design of machinery,” she added.
Mechanization backs resilient farming systems
CIMMYT has provided a model to promote the use of agricultural mechanization among smallholder farmers through service providers, affirmed Misheck Chingozha, a mechanization officer with Zimbabwe’s Ministry of Agriculture.
Farm machinery helps farmers implement sustainable crop practices that benefit from greater farm power and precision,” he said. “This is in line with the government’s strategy to promote conservation agriculture – defined by minimal soil disturbance, crop residue retention and diversification through crop rotation and intercropping.”
CIMMYT promotes small-scale mechanization, such as two-wheel tractor-based technologies, including direct seeding planters that reduce labor and allow for improved resource allocation when implementing these practices, described CIMMYT’s Baudron.
Conservation agriculture is a sustainable intensification practice that seeks to produce more food, improve nutrition and livelihoods, and boost rural incomes without an increase in inputs – such as land and water – thus reducing environmental impacts.
With support from CIMMYT, students at the University of Zimbabwe are working to develop agricultural machinery fitted to the environmental conditions and needs of farmers in their country and other parts of Africa. (Photo: Matthew O’Leary/CIMMYT)
Students fuel next-generation machinery
As part of their degree, students at the University of Zimbabwe are working with CIMMYT to continuously improve the effectiveness and efficiency of agricultural machinery.
In a bid to improve the allocation of resources, agricultural engineering student Ronald Mhlanga, 24, worked on a prototype that uses sensors to monitor the amount of seed and fertilizer distributed by planters attached to two-wheel tractors. The device sends information to the driver if anything goes off course, helping farmers improve precision and save resources.
“Often planters will get clogged with mud blocking seeding. The sensors identify this and send a signal to the driver,” said Mhlanga. “This allows the driver to focus on driving and limits wasted resources.”
Learning from farmer feedback and working with agricultural engineers and the private sector, CIMMYT is building agricultural mechanization suited to the needs and conditions of sub-Saharan African farms, concluded Baudron.
Ashley Muzhange eats sadza with her family in rural Zimabwe. Her sadza is made with vitamin A orange maize, a variety improving the nutrition of children and families in the nation. Photo: Matthew O’Leary/ CIMMYT
In the rural Chiweshe Communal Area, about two hours north of Zimbabwe’s capital Harare, 18-month-old Ashley Muzhange tucks into a bowl of vitamin A orange maize sadza. Sadza, a thickened porridge made from finely ground maize grain with a side of stewed vegetables, is the staple dish for rural families.
Ashley’s sadza is made from biofortified maize, conventionally bred by researchers at the International Maize and Wheat Improvement Center (CIMMYT) under the work of HarvestPlus to contain a higher amount of nutritious vitamin A.
Recent prolonged drought pushed malnutrition to levels not seen in over 15 years, with almost 33,000 children in need of urgent treatment for severe acute malnutrition, according to the United Nations Children’s Fund (UNICEF). Many experience micronutrient deficiencies, since their diets lack the vitamins and minerals required for growth and development.
Ashley’s mother, Lilian Muzhange, prepares fritas made with vitamin A orange maize grown on their family farm. Photo: Matthew O’Leary/ CIMMYT
According to the World Health Organization, 35.8 percent of preschool aged children suffer from vitamin A deficiency. The leading cause of preventable blindness in children, it compromises the immune system increasing the risk of death from diseases like measles, diarrhea and respiratory infections.
Biofortification increases the density of vitamins and minerals in a crop through conventional plant breeding or agronomic practices. When consumed regularly, biofortified crops generate measurable improvements in health and nutrition. The process develops crops rich in nutrients for consumers as well as the agronomic characteristics like drought and disease resistance valued by farmers. It is considered a sustainable way to bring micronutrients to populations with limited access to diverse diets.
Even though baby Ashley is unaware her sadza not only fills her stomach, but also provides her with a dose of vitamin A, her family is conscious of the benefits.
“This orange maize assures me that my daughter gets a nutritious meal and means we don’t only rely on the supplements provided by the government,” said Lilian Muzhange, her mother.
Orange the color of health
The farming family first began trialing the biofortified vitamin A orange maize in 2015 and are now growing it in place of traditional white maize. The nutritious variety contains high levels of beta-carotene, a vitamin A precursor that produces the rich orange color and once ingested is converted into the micronutrient, acting as an antioxidant to protect cells.
“Our family now prefers the new vitamin A orange maize over the white maize, as it has great health benefits for my children and granddaughter and the taste is delicious. The sadza truly is better,” said Ashley’s grandfather Musonza Musiiwa. “I was also pleased the variety is drought tolerant. Despite a dry spell in January my maize was able to yield a good harvest.”
Orange maize conventionally bred to contain high amounts of vitamin A is fighting child malnutrition in Zimbabwe. (Photo: Matthew O’Leary/ CIMMYT)
Rural diets mainly consist of what farming families can grow, which is predominantly maize, said CIMMYT maize breeder Thokozile Ndhlela. The majority of rural households do not meet minimum dietary diversity, reliant on a cereal-based diet where meat is a rarity, the Zimbabwe Food and Nutrition Council finds.
“White maize traditionally used for the staple sadza is predominantly starch and very low in nutritional value,” said Ndhlela, who leads CIMMYT’s biofortified breeding efforts in Zimbabwe. “Biofortifying this staple crop ensures consumers have access to nutritious food season after season as farmers continue to grow it.”
Musiiwa not only sees the health and agronomic benefits of vitamin A orange maize, but has also identified its economic opportunity. The farmer is planning to increase the amount he grows to capitalize on the market he believes is set to grow.
Getting vitamin A maize into farmers’ fields and onto plates
Sakile Kudita, HarvestPlus researcher, explains the benefits of of vitamin A orange maize to seed company and government representatives. Photo: Matthew O’Leary/ CIMMYT
For the new biofortified maize to be part of the food system it must be commercialized creating a full value chain, said Sakile Kudita, a demand creation researcher with HarvestPlus, a program improving nutrition and public health by developing and promoting biofortified food crops.
“Vitamin A orange maize needs to be a product millers take up and processed foods are made of, so that seed companies have an incentive to keep producing seed and farmers have an incentive to grow more than just for consumption but also sale in order to generate income,” she said.
The efforts of HarvestPlus and CIMMYT to engage government, food processors and seed companies at field days, where they learn about the nutritional and agronomic benefits and taste the orange maize have yielded success, said Kudita. Working with the government, four biofortified varieties have been commercialized since 2015.
Prime Seed Co, a subsidiary of the regional certified seed company Seed Co, was the first company commissioned by the government to commercialize vitamin A orange maize in Zimbabwe and now sells the variety Musiiwa uses in his field.
Prime Seed Co worked with CIMMYT, HarvestPlus and the Zimbabwe government to release the first vitamin A orange maize variety onto the market. Photo: Thoko Ndhlela/ CIMMYT
“Through our partnership with CIMMYT and HarvestPlus we are developing a market for vitamin A orange maize in Zimbabwe,” said Masimba Kanyepi, a sales manager at Prime Seed Co. “We have seen our sales improve since launching the first variety and expect an increase.”
Kanyepi is confident the market will grow following a new government regulation requiring all processed maize products to contain added micronutrients, including vitamin A, through fortification.
Food industry representatives taste-test foods made with vitamin A orange maize at an open day. Photo: Matthew O’Leary/ CIMMYT
“Adding vitamin A to maize at the processing stage is expensive for food companies due to the cost of importing the vitamin from overseas,” said Kanyepi. “Buying vitamin A orange maize grown by local farmers already biofortified at the same price as the white variety makes economic sense.”
Food companies see the saving with Zimbabwe manufacturer, Cairns Foods, confirming it’s taking steps to include biofortified maize in its cereals and biofortified beans in its canned products.
With food processors and millers buying vitamin A orange maize there is demand for farming families like the Musiiwas to grow more, ensuring not only a boost to their health but also their livelihood, said Kudita.
Breeding for a more nutritious future
Vitamin A orange maize in a farmer’s field. Photo: Matthew O’Leary/ CIMMYT
The crop diversity found in the maize species is key to nutritional gain. The plant grows in distinct environments and has developed a diverse range of valuable traits including nutritional properties.
Following a lengthy analysis of thousands of samples in the CIMMYT Maize Germplasm Bank researchers discovered native landraces and varieties from South and Central America containing increased levels of beta-carotene, explained Ndhlela. These were included in breeding programs in Africa and crossed with local varieties to ensure they were fit for the subtropical climate and were tolerant to local biotic and abiotic stresses.
Working alongside Zimbabwe’s national breeding program Ndhlela continually monitors, improves and combines dozens of characteristics, which include high yield potential, nitrogen use efficiency, and tolerance to drought, into new varieties that meet farmers’ preferences.
The most recent biofortified varieties contain about 39 percent more vitamin A compared to the first, she said.
“CIMMYT’s support through free access to maize germplasm and breeding expertise has allowed us to continue developing this nutritious maize,” said Prince Matova, a maize breeder with the Zimbabwe Ministry of Agriculture. “In the next few years we expect to release two more varieties.”
At the end of the day, farming is a business and farmers value varieties with high yield, adapted to stress conditions. The breeders are currently trialing new vitamin A maize varieties with the hope of identifying those with the potential to yield as much as the traditional white varieties and are already garnering positive feedback from farmers.
CIMMYT maize breeder Thoko Ndhlela shows food industry representatives the agronomic benefits of vitamin A orange maize in the field. Photo: Matthew O’Leary/ CIMMYT
CIMMYT’s biofortified vitamin A maize breeding is supported by HarvestPlus. HarvestPlus improves nutrition and public health by developing and promoting biofortified food crops that are rich in vitamins and minerals, and providing global leadership on biofortification evidence and technology. HarvestPlus is part of the CGIAR Research Program on Agriculture for Nutrition and Health (A4NH). CGIAR is a global agriculture research partnership for a food secure future. Its science is carried out by its 15 research centers in collaboration with hundreds of partner organizations. The HarvestPlus program is coordinated by two of these centers, the International Center for Tropical Agriculture (CIAT) and the International Food Policy Research Institute (IFPRI).
HarvestPlus’ principal donors are the UK Government; the Bill & Melinda Gates Foundation; the US Government’s Feed the Future initiative; the European Commission; and donors to the CGIAR Research Program on Agriculture for Nutrition and Health. HarvestPlus is also supported by the John D. and Catherine T. MacArthur Foundation.
Christian Thierfelder is a Principal Cropping Systems Agronomist working with CIMMYT’s Sustainable Intensification program.
Since 2009, Thierfelder has led CIMMYT’s conservation agriculture systems research in Southern Africa with the aim to adapt conservation agriculture systems to the needs and environments of smallholder farmers. He currently focuses on fine-tuning conservation agriculture systems to different agro-ecologies and researching farmers’ adoption of new technologies, green manure cover crops and grain legumes integration into maize-based farming systems, climate-smart agriculture, GxExM and agro-ecological management of the fall armyworm.
His research mainly covers Malawi, Zambia and Zimbabwe, and to a lesser extent Namibia. Thierfelder works with a wide range of national and international partners from research and extension in all target countries. Capacity building is a central part of his work, which includes farmers, extension officers and national researchers but also university students from all degree levels.
In the last decade, the climate of Africa has been changing in dramatic ways. Many regions face unpredictable levels of rainfall, which can lead both droughts and severe flooding. Sub-Saharan Africa is the only region in the world with over 30 percent of children under five facing stunting – severe malnutrition, and is the only region where the rate of undernourished people has consistently increased.
Maize is a vital staple cash and sustenance crop in most of Africa, and legumes provide nutrition, income and improve soil fertility. However, farmers’ yields are suffering due to declining soil fertility, drought and poor access to improved technologies.
Over the last eight years, SIMLESA has developed productive, resilient and sustainable smallholder maize-legume cropping systems. SIMLESA focuses on improving maize-legume cropping systems by encouraging the adoption of sustainable agriculture systems through conservation agriculture practices such as crop residue retention, crop rotation and intercropping practices to simultaneously maintain and boost yields, increase profits and protect the environment.
Recently, Elliud Kireger, director general of the Kenya Agricultural and Livestock Research Organization (KALRO), Mulugetta Mekuria Asfaw, SIMLESA project leader and Daniel Rodriguez, associate professor, Queensland Alliance for Agriculture and Food Innovation (QAAFI) The University of Queensland, wrote a joint opinion piece “Africa: Science Can Reverse ‘New Normal’ of Hunger and Climate Disaster” in All Africa on the impacts of SIMLESA, read it here.
The Sustainable Intensification of Maize-Legume Cropping Systems for Food Security in Eastern and Southern Africa (SIMLESA) programis funded by the Australian Centre for International Agricultural Research (ACIAR).
