Tag: nitrogen

A young man uses a precision spreader to distribute fertilizer in a field. (Photo: Mahesh Maske/CIMMYT)

Too much or never enough

Written by Emma Orchardson on December 4, 2020. Posted in Blogs.

Although nitrogen has helped in contributing to human dietary needs, there are still large areas of the world — namely sub-Saharan Africa and parts of Asia — that remain short of the amounts they need to achieve food and nutritional security.

Conversely, synthetic nitrogen has become increasingly crucial in today’s intensive agricultural systems, but nearly half of the fertilizer nitrogen applied on farms leaks into the surrounding environment. It is possible that we have now transgressed the sustainable planetary boundary for nitrogen, and this could have devasting consequences.

Given this conflicting dual role this compound plays in agricultural systems and the environment — both positive and negative — the nitrogen challenge is highly relevant across most of the 17 Sustainable Development Goals (SDGs) established by the United Nations.

Facing a global challenge

The challenge of nitrogen management globally is to provide enough nitrogen to meet global food security while minimizing the flow of unused nitrogen to the environment. One of the key approaches to addressing this is to improve nitrogen use efficiency – which not only enhances crop productivity but also minimizes environmental losses through careful agronomic management – and measures to improve soil quality over time.

Globally, average nitrogen use efficiency does not exceed 50%. Estimates show that a nitrogen use efficiency will need to reach 67% by 2050 if we are to meet global food demand while keeping surplus nitrogen within the limits for maintaining acceptable air and water qualities to meet the SDGs.

This target may seem ambitious — especially given the biological limits to achieving a very high nitrogen use efficiency — but it is achievable.

Earlier this year, J.K. Ladha and I co-authored a paper outlining the links between nitrogen fertilizer use in agricultural production systems and various SDGs. For instance, agricultural systems with suboptimal nitrogen application are characterized with low crop productivity, spiraling into the vicious cycle of poverty, malnutrition and poor economy, a case most common in the sub-Saharan Africa. These essentially relate to SDG 1 (no-poverty), 2 (zero-hunger), 3 (good health and well-being), 8 (decent work and economic growth) and 15 (life on land).

On the other hand, excess or imbalanced fertilizer nitrogen in parts of China and India have led to serious environmental hazards, degradation of land and economic loss. Balancing the amount of N input in these regions will contribute in achieving the SDG 13 (climate action). Equally, meeting some of the additional SDGs (5, gender equality; 6, clean water and sanitation; 10: reduced inequalities; etc.) requires optimum nitrogen application, which will also ensure “responsible consumption and production” (SDG 12).

A diagram shows the impact of fertilizer nitrogen use on the achievement of the Sustainable Development Goals. (Graphic: CIMMYT/Adapted from CCAFS)

So, how can we achieve this?

Increased research quantifying the linkages between nitrogen management and the SDGs will be important, but the key to success lies with raising awareness among policy makers, stakeholders and farmers.

Most agricultural soils have considerably depleted levels of soil organic matter. This is a central problem that results in agroecosystems losing their ability to retain and regulate the supply of nitrogen to crops. However, poor knowledge and heavy price subsidies are equally to blame for the excess or misuse of nitrogen.

While numerous technologies for efficient nitrogen management have been developed, delivery mechanisms need to be strengthened, as does encouragement for spontaneous adaptation and adoption by farmers. Equally — or perhaps more importantly — there is a need to create awareness and educate senior officials, policy makers, extension personnel and farmers on the impact of appropriate soil management and intelligent use of nitrogen fertilizer, in conjunction with biologically integrated strategies for soil fertility maintenance.

An effective and aggressive campaign against the misuse of nitrogen will be effective in areas where the compound is overused, while greater accessibility of nitrogen fertilizer and policies to move farmers towards soil quality improvement will be essential in regions where nitrogen use is currently sub-optimal.

It is only through this combination of approaches to improved system management, agricultural policies and awareness raising campaigns that we can sufficiently improve nitrogen use efficiency — and meet the SDGs before it’s too late.

Read the full study “Achieving the sustainable development goals in agriculture: the crucial role of nitrogen in cereal-based systems” in Advances in Agronomy.

A collage of shows images relating to different stages of the nitrogen cycle. (Graphic: Alfonso Cortés/CIMMYT)

Nitrogen in agriculture

Written by Emma Orchardson on December 4, 2020. Posted in Explainers.

Nitrogen is the most essential nutrient in crop production but also one of the most challenging to work with. The compound is central to global crop production — particularly for major cereals — but while many parts of the world do not have enough to achieve food and nutrition security, in others excess nitrogen from fertilizer leaks into the environment with damaging consequences.

What is nitrogen?

Around 78% of the Earth’s atmosphere is made up of nitrogen gas or N2 — a molecule made of two nitrogen atoms glued together by a stable, triple bond.

Though it makes up a large portion of the air we breathe, most living organisms can’t access it in this form. Atmospheric nitrogen must go through a natural process called nitrogen fixation to transform before it can be used for plant nutrition.

Why do plants need nitrogen?

In both plants and humans, nitrogen is used to make amino acids — which make the proteins that construct cells — and is one of the building blocks for DNA. It is also essential for plant growth because it is a major component of chlorophyll, the compound by which plants use sunlight energy to produce sugars from water and carbon dioxide (photosynthesis).

The nitrogen cycle

The nitrogen cycle is the process through which nitrogen moves from the atmosphere to earth, through soils and is released back into the atmosphere — converting in and out of its organic and inorganic forms.

It begins with biological nitrogen fixation, which occurs when nitrogen-fixing bacteria that live in the root nodules of legumes convert organic matter into ammonium and then nitrate. Plants are able to absorb nitrate from the soil and break it down into the nitrogen they need, while denitrifying bacteria convert excess nitrate back into inorganic nitrogen which is released back into the atmosphere.

The process can also begin with lightning, the heat from which ruptures the triple bonds of atmospheric nitrogen, freeing its atoms to combine with oxygen and create nitrous oxide gas, which dissolves in rain as nitric acid and is absorbed by the soil.

Excess nitrate or that lost through leaching — in which key nutrients are dissolved due to rain or irrigation — can seep into and pollute groundwater streams.

A diagram shows the process through which nitrogen moves from the atmosphere to earth, through soils and is released back into the atmosphere – converting in and out of its organic and inorganic forms. (Graphic: Nancy Valtierra/CIMMYT)

What about nitrogen fertilizer?

For thousands of years, humans didn’t need to worry about nitrogen, but by the turn of the Twentieth Century it was evident that intensive farming was depleting nitrate in the soil, which raised concerns about the world’s rising population and a possible food crisis.

In 1908, a German chemist named Fritz Haber devised a process for combining atmospheric nitrogen and hydrogen under extreme heat and pressure to create liquid ammonia — a synthetic nitrogen fertilizer. He later worked with chemist and engineer Carl Bosch to industrialize this process and make it commercially available for farmers.

Once production was industrialized, synthetic nitrogen fertilizer — used in combination with new, high-yielding seed varieties — helped drive the Green Revolution and significantly boost global agricultural production from the late 1960s onwards. During this time Mexico became self-sufficient in wheat production, as did India and Pakistan, which were on the brink of famine.

In today’s intensive agricultural systems, synthetic nitrogen fertilizer has become increasingly crucial. Worldwide, companies currently produce over 100 million metric tons of this product every year, and the Food and Agriculture Organization of the United Nations predicts that demand will continue to rise steadily, especially in Africa and South Asia.

Is it sustainable?

As demand continues to rise worldwide, the challenge of nitrogen management is to provide enough to meet global food security needs while minimizing the flow of unused nitrogen — which is 300 times more polluting than carbon dioxide — to the environment.

While many regions remain short of available nitrogen to achieve food and nutrition security, in others nearly half of the fertilizer nitrogen applied in agriculture is leaked into the environment, with negative consequences including increased environmental hazards, irreparable land degradation and the contamination of aquatic resources.

This challenge can be addressed by improving nitrogen use efficiency — a complex calculation which often involves a comparison between crop biomass (primarily economic yield) or nitrogen content/uptake (output) and the nitrogen applied (input) through any manure or synthetic fertilizer. Improving this ratio not only enhances crop productivity but also minimizes environmental losses through careful agronomic management and helps improve soil quality over time.

Currently, average global nitrogen use efficiency does not exceed 50%, which falls short of the estimated 67% needed to meet global food demand in 2050 while keeping surplus nitrogen within the limits for maintaining acceptable air and water qualities.

Cutting-edge technological options for nitrogen management are on the horizon, though in the short-term nitrogen use efficiency can best be improved at farmer-level, by targeting fertilizer application, use of slow-release nitrogen fertilizers, using precision nitrogen application tools (Green Seeker) or fertigation using micro irrigation.

A woman in India uses a precision spreader to apply fertilizer on her farm. (Photo: Wasim Iftikar)

Blue-sky technology

Much progress has been made in developing technologies for an efficient nitrogen management, which along with good agronomy are proven to enhance crop nitrogen harvest and nitrogen use efficiency with lower surplus nitrogen.

Scientists are investigating the merits of biological nitrification inhibition, a process through which a plant excretes material which influences the nitrogen cycle in the soil. Where this process occurs naturally — in some grasses and wheat wild relatives — it helps to significantly reduce nitrogen emissions.

In 2007, scientists discovered biological nitrification traits in a wheat relative and in 2018 they succeeded in transferring them into a Chinese spring wheat variety. The initial result showed low productivity and remains in the very early stages of development, but researchers are keen to assess whether this process could be applied to commercial wheat varieties in the future. If so, this technology could be a game changer for meeting global nitrogen use efficiency goals.

View from the experimental station in Ciudad Obregón, Sonora, northern Mexico. (Photo: M. Ellis/CIMMYT)

Warmer night temperatures reduce wheat yields in Mexico, scientists say

Written by Rodrigo Ordóñez on August 8, 2019. Posted in Features.

As many regions worldwide baked under some of the most persistent heatwaves on record, scientists at a major conference in Canada shared data on the impact of spiraling temperatures on wheat.

In the Sonora desert in northwestern Mexico, nighttime temperatures varied 4.4 degrees Celsius between 1981 and 2018, research from the International Maize and Wheat Improvement Center (CIMMYT) shows. Across the world in Siberia, nighttime temperatures rose 2 degrees Celsius between 1988 and 2015, according to Vladimir Shamanin, a professor at Russia’s Omsk State Agrarian University who conducts research with the Kazakhstan-Siberia Network on Spring Wheat Improvement.

“Although field trials across some of the hottest wheat growing environments worldwide have demonstrated that yield losses are in general associated with an increase in average temperatures, minimum temperatures at night — not maximum temperatures — are actually determining the yield loss,” said Gemma Molero, the wheat physiologist at CIMMYT who conducted the research in Sonora, in collaboration with colleague Ivan Ortiz-Monasterio.

“Of the water taken up by the roots, 95% is lost from leaves via transpiration and from this, an average of 12% of the water is lost during the night. One focus of genetic improvement for yield and water-use efficiency for the plant should be to identify traits for adaptation to higher night temperatures,” Molero said, adding that nocturnal transpiration may lead to reductions of up to 50% of available soil moisture in some regions.

Wheat fields at CIMMYT's experimental station near Ciudad Obregón, Sonora, Mexico. (Photo: M. Ellis/CIMMYT) — Wheat fields at CIMMYT’s experimental station near Ciudad Obregón, Sonora, Mexico. (Photo: M. Ellis/CIMMYT)

Climate challenge

The Intergovernmental Panel on Climate Change (IPCC) reported in October that temperatures may become an average of 1.5 degrees Celsius warmer in the next 11 years. A new IPCC analysis on climate change and land use due for release this week, urges a shift toward reducing meat in diets to help reduce agriculture-related emissions from livestock. Diets could be built around coarse grains, pulses, nuts and seeds instead.

Scientists attending the International Wheat Congress in Saskatoon, the city at the heart of Canada’s western wheat growing province of Saskatchewan, agreed that a major challenge is to develop more nutritious wheat varieties that can produce bigger yields in hotter temperatures.

CIMMYT wheat physiologist Gemma Molero presents at the International Wheat Congress. (Photo: Marcia MacNeil/CIMMYT)

As a staple crop, wheat provides 20% of all human calories consumed worldwide. It is the main source of protein for 2.5 billion people in the Global South. Crop system modeler Senthold Asseng, a professor at the University of Florida and a member of the International Wheat Yield Partnership, was involved in an extensive study in China, India, France, Russia and the United States, which demonstrated that for each degree Celsius in temperature increase, yields decline by 6%, putting food security at risk.

Wheat yields in South Asia could be cut in half due to chronically high temperatures, Molero said. Research conducted by the University of New South Wales, published in Environmental Research Letters also demonstrates that changes in climate accounted for 20 to 49% of yield fluctuations in various crops, including spring wheat. Hot and cold temperature extremes, drought and heavy precipitation accounted for 18 to 4% of the variations.

At CIMMYT, wheat breeders advocate a comprehensive approach that combines conventional, physiological and molecular breeding techniques, as well as good crop management practices that can ameliorate heat shocks. New breeding technologies are making use of wheat landraces and wild grass relatives to add stress adaptive traits into modern wheat – innovative approaches that have led to new heat tolerant varieties being grown by farmers in warmer regions of Pakistan, for example.

More than 800 global experts gathered at the first International Wheat Congress in Saskatoon, Canada, to strategize on ways to meet projected nutritional needs of 60% more people by 2050. (Photo: Matthew Hayes/Cornell University)

Collaborative effort

Matthew Reynolds, a distinguished scientist at CIMMYT, is joint founder of the Heat and Drought Wheat Improvement Consortium (HeDWIC), a coalition of hundreds of scientists and stakeholders from over 30 countries.

“HeDWIC is a pre-breeding program that aims to deliver genetically diverse advanced lines through use of shared germplasm and other technologies,” Reynolds said in Saskatoon. “It’s a knowledge-sharing and training mechanism, and a platform to deliver proofs of concept related to new technologies for adapting wheat to a range of heat and drought stress profiles.”

Aims include reaching agreement across borders and institutions on the most promising research areas to achieve climate resilience, arranging trait research into a rational framework, facilitating translational research and developing a bioinformatics cyber-infrastructure, he said, adding that attracting multi-year funding for international collaborations remains a challenge.

Nitrogen traits

Another area of climate research at CIMMYT involves the development of an affordable alternative to the use of nitrogen fertilizers to reduce planet-warming greenhouse gas emissions. In certain plants, a trait known as biological nitrification inhibition (BNI) allows them to suppress the loss of nitrogen from the soil, improving the efficiency of nitrogen uptake and use by themselves and other plants.

CIMMYT's director general Martin Kropff speaks at a session of the International Wheat Congress. (Photo: Matthew Hayes/Cornell University) — CIMMYT’s director general Martin Kropff speaks at a session of the International Wheat Congress. (Photo: Matthew Hayes/Cornell University)

Scientists with the BNI research consortium, which includes Japan’s International Research Center for Agricultural Sciences (JIRCAS), propose transferring the BNI trait from those plants to critical food and feed crops, such as wheat, sorghum and Brachiaria range grasses.

“Every year, nearly a fifth of the world’s fertilizer is used to grow wheat, yet the crop only uses about 30% of the nitrogen applied, in terms of biomass and harvested grains,” said Victor Kommerell, program manager for the multi-partner CGIAR Research Programs (CRP) on Wheat and Maize led by the International Maize and Wheat Improvement Center.

“BNI has the potential to turn wheat into a highly nitrogen-efficient crop: farmers could save money on fertilizers, and nitrous oxide emissions from wheat farming could be reduced by 30%.”

Excluding changes in land use such as deforestation, annual greenhouse gas emissions from agriculture each year are equivalent to 11% of all emissions from human activities. About 70% of nitrogen applied to crops in fertilizers is either washed away or becomes nitrous oxide, a greenhouse gas 300 times more potent than carbon dioxide, according to Guntur Subbarao, a principal scientist with JIRCAS.

Hans-Joachim Braun,
Director of CIMMYT’s Global Wheat Program and the CGIAR Research Program on Wheat, speaks at the International Wheat Congress. (Photo: Marcia MacNeil/CIMMYT)

Although ruminant livestock are responsible for generating roughly half of all agricultural production emissions, BNI offers potential for reducing overall emissions, said Tim Searchinger, senior fellow at the World Resources Institute and technical director of a new report titled “Creating a Sustainable Food Future: A Menu of Solutions to Feed Nearly 10 Billion People by 2050.”

To exploit this roots-based characteristic, breeders would have to breed this trait into plants, said Searchinger, who presented key findings of the report in Saskatoon, adding that governments and research agencies should increase research funding.

Other climate change mitigation efforts must include revitalizing degraded soils, which affect about a quarter of the planet’s cropland, to help boost crop yields. Conservation agriculture techniques involve retaining crop residues on fields instead of burning and clearing. Direct seeding into soil-with-residue and agroforestry also can play a key role.

Cobs & Spikes podcast: Nitrogen science explainer

Written by on November 27, 2018. Posted in Podcasts.

Nitrogen is essential to life, and almost 80% of the atmosphere is made up of this element. But mostly living organisms can’t access it in this form. On this episode, we’re going to explore the natural process of nitrogen fixation, which transforms atmospheric nitrogen into a form our bodies can use. We’ll also look at a scientific breakthrough that made it possible to create synthetic nitrogen fertilizer. It supported the Green Revolution and our current global population of 7.2 billion people. However, there are some negative effects that come with overuse and misuse of these fertilizers. Join us for this short science explainer.

You can listen to our podcast here, or subscribe on iTunes, SoundCloud or Stitcher.

Samjhana Khanal surveys heat-tolerant maize varieties in Ludhiana, India, during a field day at the 13th Asian Maize Conference. (Photo: Manjit Singh/Punjab Agricultural University)

Let’s make hunger history

Written by on November 22, 2018. Posted in Blogs.

KATHMANDU, Nepal — I feel humbled and honored to have been chosen for the 2018 MAIZE-Asia Youth Innovators Award. I want to thank my father and brother for never clipping my wings and letting me fly high. I want to thank my mother, who despite having no education, not being able to read or write a single word, dreamed of having a scientist daughter. Everyone has a story and this is mine.

Due to my family’s poverty and the hardships faced during the civil war in Nepal, I had to leave school at grade 5 and was compelled to work as child labor in a local hotel to meet my family’s daily needs. I remember those difficult months where I used to cry every day, as the hotel was right across from the school and I wanted to study so badly but I was deprived from education due to my family’s condition. My life changed when a mountain climber staying at the hotel heard my story and generously decided to pay my school fees. I would go on to graduate top of my class.

Everyone has challenges. It is my dream to dedicate my life to fight the greatest challenge of all: hunger.

The amount of undernourished people in the world has been increasing. According to the Food and Agriculture Organization of the United Nations (FAO), over 820 million people face chronic food deprivation. Many of these people live in developing countries, including my home country, Nepal. About 6 million people, which is about 23% of Nepal’s population, are undernourished. Moreover, half of children under the age of five suffer from malnutrition in Nepal.

Increasing agricultural production, gender equity and awareness is crucial to meet sustainable development goals by 2030. As an agricultural student, I chose to focus on maize-based systems, as maize is a staple food crop and a major component of feed and fodder for farm animals. It is the second major crop in Nepal after rice — first in the hill region of Nepal — and can be a backbone for food security and a good source of income for resource-poor farmers.

Demand for maize is growing in Nepal, but production has remained stagnant. This is partly due to lack of knowledge on proper nutrient management and fertilizer use. In addition, due to the economic situation in Nepal, many men have been forced to migrate to find work and support their families, which has led to an increased “feminization” of agriculture. However, female farmers frequently have less access to information and resources that would help them to increase yields.

Since my undergraduate degree, I have carried out research on nutrient management in maize in the Eastern Terai region of Nepal, particularly focusing on women, to increase the maize production and income of smallholder farmers. My research involved the use of Nutrient Expert, a dynamic nutrient management tool based on site-specific nutrient management principles, to increase maize production and enhance soil quality without negatively affecting the environment. Regional fertilizer recommendations are often too broad and cannot take into account the soil quality of individual farmers’ field, as it varies greatly among fields, seasons and years. Applying the incorrect amount of fertilizer is costly to farmers and can negatively affect the environment and crop yields.

The Nutrient Expert app rapidly provides farm-specific fertilizer recommendations for nitrogen, phosphorus and potassium for crops in the presence or absence of soil testing results, contributing to dynamic nutrient management, increased productivity and net returns from crops for farmers. In the meantime, it helps to decrease the nitrogen and phosphorous leaching from the soil into rivers, which protects the water ecosystem both in wetlands and oceans. This technology is sustainable because it optimizes the use of nutrients in the soil for higher productivity and prevents the overuse of fertilizer. It decreases the farmer’s cost of production and is environmentally friendly. Further, my research showed that Nutrient Expert helped farmers to produce 86.6% more maize grain than their previous fertilizer practice.

Proper nutrient management is just one of the challenges facing agriculture today. To address these challenges and to create a world without hunger it is extremely important to work with and include young people. Effective extension tools to train and motivate young minds in research and create more interest in maize-based systems and farming is necessary for the overall adoption and proper utilization of improved varieties and technologies.

Samjhana Khanal was recently awarded the 2018 MAIZE-Asia Youth Innovators Award from the CGIAR Research Program on Maize (MAIZE) in the category of “Change Agent” for her research on the productivity and profitability of hybrid maize in Eastern Terai, Nepal. Using Nutrient Expert, a decision support tool, individual maize farmers can get specific soil nutrition and fertilizer recommendations, resulting in higher grain yield, productivity and profits.

An agricultural graduate, Khanal has founded and co-founded several local social organizations in Nepal to involve young minds in the development of innovative strategies to work towards sustainable agriculture and zero hunger. Her organizations support more than 285 households with community microfinance, help resource-poor farmers and assist women farmers.

The MAIZE-Asia Youth Innovators Awards aim to celebrate youth participation in maize-based agri-food systems and are sponsored by the CGIAR Research Program on Maize (MAIZE) in collaboration with Young Professionals for Agricultural Development (YPARD).

The Director General of CIMMYT, Martin Kropff (left), and the Chair of the MAIZE Independent Steering Committee, Michael Robinson (right), present Samjhana Khanal with the 2018 MAIZE-Asia Youth Innovator Award in the category of Change Agent. (Photo: Manjit Singh/Punjab Agricultural University)

Q+A with Iván Ortíz-Monasterio on nitrogen application and consequences

Written by on May 7, 2018. Posted in News.

Iván Ortíz-Monasterio, expert on sustainable intensification and wheat crop management at the International Maize and Wheat Improvement Center (CIMMYT), recently took part in a study detailing the detriments of excess fertilizer use and the benefits of more precise dosages.

In the following interview, he discusses the overuse of nitrogen fertilizer and related consequences, his experience with farmers, and his outlook for the future. According to Ortíz-Monasterio and study co-authors, research on wheat in the Yaqui Valley, state of Sonora, northwestern Mexico, and home to CIMMYT’s Norman E. Borlaug Experiment Station (CENEB), has direct implications for wheat crop management worldwide.

“The Yaqui Valley is agro-climatically representative of areas where 40 percent of the world’s wheat is grown, including places like the Indo-Gangetic Plains of India and Pakistan, the Nile Delta in Egypt, and the wheat lands of China,” said Ortíz-Monasterio.

Q: A key finding of the new publication was that, after a certain point, applying more nitrogen fertilizer does not increase yields, making excessive applications essentially a drain on farmers’ resources. Why then do farmers continue to apply more fertilizer than the crop needs?

A: Well there is a risk, if you under-apply N fertilizer, your yield goes down. Farmers are afraid that the yield will be lower and that their profit will be lower. The cost of under-applying for them is greater than the cost of over-applying, because they’re not paying all the costs of over applying. Those costs include the environmental impacts associated with greenhouse gas emissions, at a regional scale in the case of the Yaqui Valley because of nitrification of the Sea of Cortez, and at a local level due to contamination of the water table. All these costs are passed on to society. If we passed them on to farmers, then they would be more concerned about over-applying nitrogen fertilizers.

Q: Do you think farmers becoming more concerned is something that could happen?

A: Well there are starting to be more regulations in Europe. In the UK, farmers cannot apply any nitrogen before or at sowing; they can apply fertilizer only once the plant is about 15 centimeters tall. In other parts of Europe, like Germany, farmers cannot apply more than 150 kilograms of nitrogen on wheat, so it’s happening in other parts of the world. The government of Mexico and others are making commitments to reduce nitrous oxide emissions by 20 percent by 2030 and, in the case of agriculture, the main source of nitrous oxide is nitrogen fertilizer. To meet such commitments, governments will have to take policy action so, yes; I think there’s a good chance something will happen.

Q: There are technologies that can help farmers know precisely when to apply fertilizer and how much, for optimal crop yield and nitrogen use. Do many farmers use them? Why or why not?

NDVI map. Photo: CIMMYT. — NDVI (normalized difference vegetative index) map. Photo: CIMMYT archives

A: Something interesting to me is what’s happening right now. For the last 10 years, we’ve been working with Yaqui Valley farmers to test and promote hand-held sensors and hiring farm advisors paid with government money who provide this service free to farmers, and adoption was high. Then the government removed the subsidy, expecting farmers to begin covering the cost, but

farmers didn’t want to pay for it.

Then a company that uses drones approached me and other researchers in the region and requested our help to convert wheat crop sensor data obtained using airborne drones to recommended fertilizer dosages. We agreed and, in their first year of operation, farmers growing wheat on 1,000 hectares paid for this service. I don’t know what it is—maybe seeing a colorful map is more sexy—but farmers seem to be willing to pay if you fly a drone to collect the data instead of having a farm advisor walk over the field. But it’s great! In the past we relied on the government to transfer the technology and now we have this great example of a private-public partnership, where a company is helping to transfer the technology and making a profit, so that will make it sustainable. I’m very excited about that!

Q: Does CIMMYT have a plan to increase adoption of these technologies?

A CIMMYT technician uses a hand-held sensor to measure NDVI (normalized difference vegetative index) in a wheat field at the center's CENEB experiment station near Ciudad Obregón, Sonora, northern Mexico. Photo: CIMMYT. — A CIMMYT technician uses a hand-held sensor to measure NDVI (normalized difference vegetative index) in a wheat field at the center’s CENEB experiment station near Ciudad Obregón, Sonora, northern Mexico. Photo: CIMMYT archives

A: We’re not married to one technology, but need to work with all of them. You know we started with Greekseeker, which is a ground-based sensor, and now we’re also working with drones, with manned airplanes mounted with cameras, and even satellite images. So, there are four different ways to collect the data, and we’ve seen that the Greenseeker results correlate well with all of them, so the technology we developed originally for Greenseeker can be used with all the other platforms.

Q: Are you optimistic that farmers can shift their perceptions in this area and significantly reduce their nitrogen use?

A: I think we’re moving in that direction, but slowly. We need policy help from the government. Officials need to give some type of incentive to farmers to use the technology, because when farmers do something different they see it as a risk. To compensate for that risk, give them a carrot, rather than a stick, and I think that will help us move the technology faster.

Precision Nutrient Management: The Future of Nitrogen Use Efficiency

Written by on April 20, 2018. Posted in News.

This March, the Borlaug Institute of South Asia (BISA) held an international workshop on enhancing Nitrogen use efficiency in wheat using the combined approach of breeding and precision agronomy in Ladhowal, Punjab. The objective of this workshop was to train young scientists and students on new opportunities for improving Nitrogen use efficiency in wheat. This initiative is a part of the project supported by the Rothamsted Research, U.K. known as the Indo-U.K. Centre. Eighteen young scientists and post-graduate students from organizations across India and the U.K. attended the event.

The workshop was kicked off by N.S. Bains, director of research, Punjab Agricultural University (PAU), who emphasized the need to increase Nitrogen use efficiency (NUE) in wheat through breeding and agronomic adjustments. The workshop combined lectures and hands-on activities during field visits. In the lectures, participants received a global overview of fertilizer use and strategies for improving NUE in cereals with special reference to wheat. Lecturers used examples from the International Maize and Wheat Improvement Center (CIMMYT) germplasm bank to highlight the variability of genetic NUE in wheat, explored modeling approaches for improving NUE and soil-based approaches.

BISA organized field visits to provide a real-life learning platform for participants to see the precision nutrient management techniques used in the research trials. Coordinators provided hands-on training about in field root measurements and other physiological and agronomic traits. Coordinators defined NUE, discussed calculations and explained how root traits can affect Nitrogen use efficiency – extensive root systems allow plants to use Nitrogen more effectively. The group participated in using a handheld GreenSeeker Nitrogen sensor with the help of algorithms to find critical values nitrogen and fertilizer doses.

Concluding the workshop, Rajbir Singh, director, ICAR-Agricultural Technology Application Research Institute (ATARI) at PAU, Ludhiana said “precision nutrient management is the new and futuristic research in the field of NUE.”

Feedback from participants shows an increased understanding of processes and procedures for improved NUE in wheat, genotype by environment interactions and recent advances in precision nutrient management. The site-specific knowledge and hands-on training supported better understanding on rate and timing effects of Nitrogen in conventionally and fertigation applied fertilizer. The knowledge exchange of experts from multi-disciplinary fields enhanced the understanding of principles of precision nutrient management and provided guidance for organizing the precision nutrition platform.

The Borlaug Institute for South Asia is a non-profit international research institute dedicated to food, nutrition and livelihood security as well as environmental rehabilitation in South Asia, which is home to more than 300 million undernourished people. BISA is a collaborative effort involving the International Maize and Wheat Improvement Center and the Indian Council for Agricultural Research. The objective of BISA is to harness the latest technology in agriculture to improve farm productivity and sustainably meet the demands of the future.

Study reveals new opportunities to cut greenhouse gas emissions in India

Written by on September 4, 2017. Posted in News.

India is one of the world’s largest contributors to global warming, but simple changes in farm management can drastically cut emissions while meeting food demand.

More than 122 million people could be thrown into extreme poverty by 2030 from climate change induced by global warming, mostly in Africa and Asia.

Agriculture is one of the largest contributors to global warming, with greenhouse gas emissions predicted to rise 30 percent over the next three decades due to rising populations and changing consumer preferences to high-emission foods like dairy and meat in these two regions.

India alone is the third largest emitter of greenhouse gasses in the world, with agriculture contributing the most greenhouse gas emissions in the country after electricity. With a population of more than 1.3 billion and increasing, ensuring sustainable agricultural development is critical to achieve the country’s 2015 climate plan to reduce emissions intensity 35 percent by 2030 and food security for the region.

In a recent study, we analyzed how cereal farmers in India’s Indo-Gangetic Plain – an area that feeds 40 percent of the country’s population – manage their crops and the impact different practices have on yield and emissions.

Reducing nitrogen fertilizer can cut emissions without compromising yield

Nitrogen fertilizer is a huge greenhouse gas emitter. Creating it involves burning a lot of fossil fuel, and is produced primarily using natural gas. When farmers apply it to their fields, rain washes much of it into surrounding bodies of water, while bacteria in the soil feed on what’s left, releasing a powerful greenhouse gas called nitrous oxide.

16 million tons of nitrogen fertilizer are currently being applied by Indian farmers to their fields. Our research shows that farmers in India can reduce emissions and increase yields through better nitrogen management.

Culture and economics have a huge impact on emissions and yields

We also found various cultural, economic, household and other social factors significantly determined whether farmers adopted low-emission technologies.

For example, households with high levels of education, large land holdings and access to agricultural advisory, as well as farmers who received training on climate change, were likely to adopt zero tillage, a practice that retains soil moisture, builds up nutrients and decreases greenhouse gas emissions.

Other farmers who received training on climate change along with crop, soil, water and seed management, and those having access to agricultural credit tend to adopt low-emission technologies such as split application of nitrogen and use of farm yard manure.

Overall, capacity building that increases farmers’ awareness and skills in agriculture and climate change contributes to increased production and reduced emission intensity for all households. Farmers’ societies, farm cooperatives and local non-governmental organizations can therefore play a vital role in encouraging farmers to adopt appropriate low-emissions practices and technologies.

Government action needed for low-emission agriculture in India

Knowing the impact of various social drivers and low-emission strategies, particularly the decrease of nitrogen fertilizer use, on agricultural development can help increase production and reduce emissions nationwide.

State and local governments must integrate policies and technology that enhance farmer access to new innovations like zero tillage and irrigation, and provide more information on efficient residue, farm manure and nitrogen fertilizer management. The government must also adopt multiple approaches that include targeted subsidies for sustainable technologies like zero tillage machinery and precision land levelers, mobilize local civil society organizations to increase knowledge about low-emission practices and use information communication technology to increase awareness and access to information about sustainable agricultural practices.

Most importantly, all mitigation-related interventions require investment decisions at the household level. Family and farm size, the gender of household head and many other factors rare critical to take into account in each intervention to successfully scale out low-emission practices and technologies.

Read the full study “Identifying high-yield low-emission pathways for the cereal production in South Asia” here.

Read the CCAFS blog “Report identifies high-yield, low-emission options for cereal systems in South Asia”

Read the 2016 CIMMYT Annual Report story “India farmers put aside the plow, save straw and fight pollution”