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This story is one of a series of features written during CIMMYT’s 50th anniversary year to highlight significant advancements in maize and wheat research between 1966 and 2016.

HARARE, Zimbabwe (CIMMYT) — When practiced unsustainably, agriculture has led to environmental degradation and famine, which have plagued civilizations through the centuries. Innovations such as irrigation or the plow (since circa 6,000 and 3,000 BC) increased productivity, but often deteriorated long-term soil fertility through erosion and other forms of degradation.

We are now facing historically unprecedented challenges to food security. We must increase food production by 70 percent to feed nine billion people by 2050, without damaging our finite and often already degraded natural resource base. In addition, farmers face more frequent drought and water scarcity, which makes it increasingly difficult to grow crops, and extreme weather events such as the 2015-2016 El Niño, which has already caused large-scale crop failures and soaring maize prices in southern Africa.

Conservation agriculture (CA) practices based on the principles of minimal soil disturbance, permanent soil cover and crop rotation are helping farmers combat growing environmental challenges by maintaining and boosting yields, while protecting the environment and increasing profits for smallholders globally. When CA practices are coupled with water-use efficient and drought tolerant varieties, the benefits are even greater.

“CA approaches can mean the difference between farmers being able to feed their families or having to starve,” says Christian Thierfelder, senior cropping systems agronomist at the International Maize and Wheat Improvement Center (CIMMYT), regarding the recent El Niño – the strongest on record – in southern Africa. To date, approximately 10 million people in southern Africa are dependent on food aid and an estimated 50 million people are projected to be affected, pushing them to the brink of starvation.

Sustainable intensification of agricultural systems and practices such as CA have become a necessity for farmers in Africa, where a combination of climate change and unsustainable agricultural practices are undermining land and water resources. This, coupled with an exploding population, makes increasing productivity while conserving the environment absolutely urgent.

Based on its experience in Latin America, which began in the early 1990s, CIMMYT started its first CA project in Africa in 2004, targeting Malawi, Mozambique, Tanzania, Zambia and Zimbabwe. This initial work focused on understanding CA systems in the context of farmers and their environmental conditions and was funded by the German government and the International Fund for Agriculture Development. Its aim was to facilitate the adoption of CA systems by smallholder farmers. This culminated in the establishment in 2009 of a large PAN-African project on Sustainable Intensification of Maize-Legume Systems in Eastern and Southern Africa (SIMLESA).

Since then, CIMMYT has leveraged its large network of partners to scale out CA. Between 2010 and 2015, CIMMYT, supported by a large group of donors including the Australian Centre for International Agricultural Research, the International Fund for Agricultural Development, the United States Agency for International Development and the Food and Agriculture Organization of the United Nations, helped over 173,000 farming households in the region adopt sustainable intensification practices.

Today, CA research at CIMMYT in Africa is increasingly focused on adaptation to the changing climate, which is leading to more erratic rainfall, increased heat stress and seasonal dry spells, in an effort to increase the use of climate-resilient cropping systems. CIMMYT’s work on CA in the region has shown that the practice can significantly increase farmers’ resilience to climate variability and change. Combining sustainable intensification practices with improved varieties has proved to increase productivity by 30-60 percent and income by 40-100 percent under drought conditions.

Despite CA’s successes, many smallholder farmers in developing countries still lack knowledge and understanding of sustainable agricultural practices and often revert to traditional farming practices that are labor-intensive and environmentally damaging. Also, CA systems are difficult to scale out if favorable policies and markets are not in place.

Mineral fertilizer, for example, is a basic agricultural input, but its adoption and use remain limited in sub-Saharan Africa. Farmers apply less than 10 kilograms per hectare on average due mainly to poor distribution networks (especially in rural areas) and high prices that are 3-5 times those in Europe. Lack of knowledge and training on how to use mineral fertilizer and other agricultural inputs renders them ineffective.

New discoveries in agriculture and breeding must be adaptable and transferable to smallholder farmers. This means improving physical distribution of technologies, training, knowledge and information sharing, credit availability and creating enabling environments for growth.

Just before passing away in September 2009, world-renowned agricultural scientist Norman Borlaug famously implored the world to “take it to the farmer” – a call to action we must follow if we are to sustainably feed the world by 2050. Without a basic understanding of good agricultural practices, most smallholder farmers will not be able to grow enough crops to move past subsistence farming.

This story is one of a series of features written during CIMMYT’s 50th anniversary year to highlight significant advancements in maize and wheat research between 1966 and 2016.

EL BATAN, Mexico (CIMMYT) — In the early 1990s, before climate change caught popular attention, the United Nations Development Programme (UNDP) provided funding for an international team of scientists in Mexico to find a better way to breed resilient maize for farmers in drought-prone tropical areas.

Fast forward several decades and that scientific concept is now reality. By early 2016 more than 2 million farmers were acquiring and growing drought-tolerant varieties from that early research in 13 countries of sub-Saharan Africa, a region where maize, the number-one food crop, frequently fails under erratic rainfall and lethal droughts.

Survival of the fittest

The core methodology, developed at CIMMYT, was to genetically select maize lines that survive and yield grain under controlled drought or low soil nitrogen on experimental plots. This imparts tolerance in maize to both dry conditions during flowering and grain-filling, when the plant is particularly sensitive to stress, and to the nitrogen-depleted soils typical of small-scale farms in the tropics.

Maize plants are designed with male flowers, called tassels, at the top, and female flowers, known as silks, which emerge later from young ears and catch pollen. Research in the 1970s had shown that, under drought, maize plants whose silks appear soonest after tassels also produce more grain, according to Greg Edmeades, a retired maize physiologist who led development of CIMMYT’s drought breeding system in the 1980s-90s.

“We used that trait, known as anthesis-silking interval, as a key yardstick to select maize lines and populations that did well under drought,” he explained, citing important contributions from his post-doctoral fellows Marianne Bänziger, Jorge Bolaños, Scott Chapman, Anne Elings, Renee Lafitte, and Stephen Mugo. “We discovered that earlier silking meant plants were sending more carbohydrates to the ear.”

Ground-truthing the science

In their studies, Edmeades and his team subjected many thousands of maize lines to stress testing on desert and mid-altitude fields in Mexico, dosing out water drop by drop. Reported in a series of journal papers and at two international conferences on maize stress breeding, their results outlined a new approach to create climate-resilient maize.

“The idea was to replicate the two most common and challenging nemeses of resource-poor farming systems, drought and low nitrogen stress, in a controlled way on breeding stations, and to use this to select tolerant varieties,” said Bänziger, now Deputy Director General for Research and Partnerships at CIMMYT. “After eight cycles of selection for reduced anthesis-silking interval under controlled drought stress, Greg’s model maize population gave 30 percent more grain than conventional varieties, in moderate-to-severe drought conditions.”

But could the approach be implemented in developing country breeding programs, where researchers typically tested and showcased high-yielding, optimally-watered maize?

Capitalizing on several years’ experience in Edmeades’ team, in 1996 Bänziger aimed to find out, moving to CIMMYT’s office in Zimbabwe and beginning work with breeders in the region to develop Africa-adapted, stress tolerant maize.

“African farmers grow maize by choice,” she explained. “If you give them access to varieties that better withstand their harsh conditions and reduce their risk, they may invest in inputs like fertilizer or diversify crop production, improving their incomes and food security.”

The efforts started by Bänziger and several other CIMMYT scientists in sub-Saharan Africa involved large, long-running projects in the region’s major maize-growing areas, with co-leadership of the International Institute of Tropical Agriculture (IITA), extensive and generous donor support, and the critical participation of regional associations, national research programs, private seed companies, and non-governmental organizations. Partners also pioneered innovative ways for farmers to take part in testing and selecting varieties and worked to foster high-quality, competitive seed markets.

The most recent initiative, Drought Tolerant Maize for Africa (DTMA), has been responsible for the development and release of more than 200 drought tolerant varieties. A new phase aims by 2019 to attain an annual production of as much as 68,000 tons of certified seed of resilient maize, for use by approximately 5.8 million households and benefitting more than 30 million people in the region. 

Maize stress breeding goes global

Selecting for tolerance under controlled moisture stress has proven so successful that it is now a standard component of maize breeding programmes in Africa, Asia, and Latin America, according to Edmeades.

“The long pursuit of drought tolerance in maize shows how successful research-for-development demands doggedness and enduring donor support,” said Edmeades, who credits former CIMMYT scientists P.R. Goldsworthy, Ken Fischer, and Elmer Johnson with laying the groundwork for his studies. “And, as can be seen, many donors and partners have helped greatly to amplify the impact of UNDP’s initial investment.”

Over the years, generous funding for this work has also been provided by the Bill & Melinda Gates Foundation; the Federal Ministry for Economic Cooperation and Development, Germany (GTZ); the Howard G. Buffett Foundation; the International Fund for Agricultural Development (IFAD); the Swedish International Development Agency (SIDA); the Swiss Agency for Development and Cooperation (SDC); the UK Department for International Development (DFID); and the US Agency for International Development (USAID).

This short history of drought tolerance breeding for tropical maize was developed in collaboration with UNDP, as part of CIMMYT and UNDP’s 50th anniversary celebrations, which coincide in 2016. To read the version published by UNDP, click here.

See also these stories about farmers’ circumstances and advances on drought tolerant maize in Africa:
* Peter’s resolve to grow maize amidst poor yields due to harsh climate and poor seeds.
* A 2011 post in Roger Thurow’s “Outrage and Inspire” blog.