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America may have legitimate competitive reasons to worry about the number of computer science and engineering graduates from elite Chinese and Indian universities – the figure dwarfs that of U.S. students with similar degrees.

But a new book by Stanford researchers and others says that the concern that these countries will develop their own centers of high-tech production and innovation and draw research, development and scholarship away from American shores is still premature.

The research, a multidisciplinary look at the growth of higher education in the world's four largest developing economies – Brazil, Russia, India and China (known collectively as the BRICs) – analyzes the quality of institutions, the quantity of people getting degrees and equal access to education.

The book, University Expansion in a Changing Global Economy: Triumph of the BRICS?, is published by Stanford University Press.

"In the past 20 years, university systems in these big countries have just exploded," said Martin Carnoy, a Stanford professor of education and one of the authors. Carnoy is also an affilate of the Center on Democracy, Development, and the Rule of Law at the Freeman Spogli Institute for International Studies.

"So the questions are why did it happen and what are the implications? And specifically, what are the implications for the U.S. if the market is flooded with new scientists and engineers? Are we going to be overwhelmed? What happens to their societies if all the energy is focused on elite institutions," Carnoy said.

The researchers approached their questions with the belief that societies, and governments, can be judged by the way they invest in and organize their public higher education systems.

For example, how well these countries create a labor force that is competitive in the information age depends on the quality of higher education. Whether people have equal chances to succeed relies on having colleges that are accessible to even the poorest students. And how effectively a country expands its university system may determine how successful it is at growing a robust economy and competing with the United States and Europe, the scholars argue.

"If you have economic growth and provide educational opportunities, you're perceived as a legitimate, successful government," Carnoy said. "So our theory was, if you can pull this off, if you can successfully expand your university systems, you are likely a pretty efficient government."

BRIC undergraduate education increased from about 19 million students in 2000 to more than 40 million students in 2010. The largest increase was in China, which went from less than 3 million to almost 12 million bachelor's degree students during that period, the study says.

Financing elite schools

The study found that BRIC countries are pouring money into their elite colleges in an effort to create world-class institutions and have their graduates compete with the United States and Europe.

Researchers say the elite colleges are much better for the focused investment, and the engineers and computer scientists are graduating with similar competency and training as those from developed countries.

But the mass institutions are receiving fewer resources, the study says, and that's where most of the students go. In 2009, 2.1 million of the 2.5 million total bachelor's graduates in China matriculated from mass institutions, not elite ones. In India, it was 2.2 million of 2.3 million.

Students read college application forms for admission to undergraduate courses at Delhi University in New Delhi, India. Delhi University has over 300,000 students and is one of the largest universities in the world.

This widening funding gap between top schools and mass institutions has broad implications, the scholars argue. The gap has the potential to slow economic growth domestically, deepen income inequality and create less social mobility.

Students who go to the mass institutions aren't getting high quality, competitive educational experiences, the study says, and many of the students also get stuck with big bills as funding assistance is directed toward the elite universities.

"What happens, then, is they are doing a good job of educating students at the elite levels, but they are not doing a good job of educating students at the non-elite levels who are also fundamental for the economy," said Prashant Loyalka, a research fellow at FSI and one of the study's authors.

In absolute terms, the sheer numbers of students graduating from elite institutions in computer science and engineering majors in these countries is also high. In China, for example, the total number of computer science and engineering graduates from elite universities is more than the total number of such graduates from the United States.

But sustaining and building innovation hubs requires more than the elite, the researchers said. The engine of these new economies is the rest of the population – those that attend mass institutions.

"In the United States, we have relied on competent second-tier engineers. They are the guts of our system. We need good students in all fields in these second-tier universities because the top-tier universities just don't produce that many graduates. They simply don't," Carnoy said.

He warned that this redistribution of funds away from second-tier institutions is a concern in the United States as well. "To an extent the BRICs have to do it, because they don't have enough resources to go around. But do we have to do it? The answer is probably no. It certainly should be no," Carnoy said.

The research is one of the first empirical and comparative looks at the higher education systems across these countries, and relied on in-country interviews, surveys, data analysis and classroom observation.

Report card

Overall, the researchers found that significant challenges remain as these countries march toward creating universities that can rank alongside those in the United States and Europe.

China, the scholars said, is doing pretty well, but Russia and Brazil are question marks.

"Russia has provided the vast majority of its people with a high level of education, but it has lagged in terms of putting money into research," Loyalka said. "Brazil has a high-level of graduate education and research at its top-tier public institutions, and these institutions are receiving a lot of support. However, the vast majority of students attend private institutions, which are, on average, of dubious quality."

India, Loyalka noted, was surprising. Despite its very good technical universities, he said, "you have a small proportion of Indians going to those, and the mass institutions are of really poor quality."

"The higher education system in India does not appear to be well organized," Loyalka said.

Among other recommendations, the researchers said India should increase its graduate education and, along with Russia, increase spending on research.

The project began in 2007 as an interdisciplinary venture supported by FSI, and incorporated scholars in economics and international comparative education at Stanford Graduate School of Education, FSI and universities in Moscow and Beijing.

Several articles focusing on different aspects of the review also have been published over the past year. The most recent, which appears in the July/August issue of the journal Change, highlights the research on quality and quantity of graduates in engineering and computer science from the four countries.

Besides Carnoy and Loyalka, the scholars involved in the project include Maria Dobryakova, a research associate and the director for portals at the Center for Monitoring Quality Education at the Higher School of Economics in Moscow; Rafiq Dossani, a senior economist at RAND Corp. and former senior research scholar at Stanford's Shorenstein Asia-Pacific Research Center at the Freeman Spogli Institute; Isak Froumin, a mathematician and director of the Institute for Educational Studies at the National Research University Higher School of Economics in Moscow; Katherine Kuhns, who received her PhD in the International and Comparative Education Program at Stanford Graduate School of Education; Jandhyala B. G. Tilak, a professor at the National University of Educational Planning and Administration in New Delhi, India; and Rong Wang, director and professor of the China Institute for Educational Finance Research at Peking University.

Brooke Donald is the social sciences writer at the Stanford News Service.

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Human exposure to lead in the environment causes irreversible impairment of intellectual function. In Bangladesh, where some rural residents have unexpectedly high levels of lead in their blood, the source is proving difficult to pinpoint. This project will evaluate the severity of lead poisoning in rural Bangladesh and identify the pathway of exposure to help develop focused prevention strategies.

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Climate change is already affecting crop production around the world through rising temperatures, changes in rainfall patterns and increasing CO2 in the atmosphere. A new Stanford study published June 14 in Environmental Research Letters examines extreme heat effects on crops during the flowering period and finds the world's staple crops are increasingly at risk.

We are beginning to see exposure to reproductive extreme heat for wheat in Central & South Asia and for rice in South Asia. Maize (corn) harvested area exposed to extreme heat is projected to grow from 15% in the 2000s to 44% by 2050. By 2050, all crops will see increased exposure, especially in tropical areas. For rice, the primary growing areas in South, Southeast and East Asia will become increasingly risky, whereas for wheat, Russia, Central Asia, and the Middle East will continue to be problematic.

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Long-term warming trends across the globe have shifted the distribution of temperature variability, such that what was once classified as extreme heat relative to local mean conditions has become more common. This is also true for agricultural regions, where exposure to extreme heat, particularly during key growth phases such as the reproductive period, can severely damage crop production in ways that are not captured by most crop models. Here, we analyze exposure of crops to physiologically critical temperatures in the reproductive stage (Tcrit), across the global harvested areas of maize, rice, soybean and wheat. Trends for the 1980–2011 period show a relatively weak correspondence (r = 0.19) between mean growing season temperature and Tcritexposure trends, emphasizing the importance of separate analyses for Tcrit. Increasing Tcrit exposure in the past few decades is apparent for wheat in Central and South Asia and South America, and for maize in many diverse locations across the globe. Maize had the highest percentage (15%) of global harvested area exposed to at least five reproductive days over Tcrit in the 2000s, although this value is somewhat sensitive to the exact temperature used for the threshold. While there was relatively little sustained exposure to reproductive days over Tcrit for the other crops in the past few decades, all show increases with future warming. Using projections from climate models we estimate that by the 2030s, 31, 16, and 11% respectively of maize, rice, and wheat global harvested area will be exposed to at least five reproductive days over Tcrit in a typical year, with soybean much less affected. Both maize and rice exhibit non-linear increases with time, with total area exposed for rice projected to grow from 8% in the 2000s to 27% by the 2050s, and maize from 15 to 44% over the same period. While faster development should lead to earlier flowering, which would reduce reproductive extreme heat exposure for wheat on a global basis, this would have little impact for the other crops. Therefore, regardless of the impact of other global change factors (such as increasing atmospheric CO2), reproductive extreme heat exposure will pose risks for global crop production without adaptive measures such as changes in sowing dates, crop and variety switching, expansion of irrigation, and agricultural expansion into cooler areas.

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China is indeed an intriguing potential role model for developing nations in quest of rapid economic growth and successful poverty reduction. It has not only sustained an average annual GDP growth rate of 10 percent between 1980 and 2011, it has also been extraordinarily successful at reducing poverty, taking more than 650 million people out of extreme poverty over the period. These are two extraordinary feats. It is, however, often said that China is a unique case, with few transposable lessons due to its exceptional size and past. With Sub-Saharan Africa (SSA) at a time of economic takeoff and in need of sustained growth and massive poverty reduction, finding out if at least some lessons from the Chinese experience are transposable can be a useful contribution. There are no better researchers to inform us on this than Scott Rozelle and Jikun Huang. So, what they have to say is indeed important. In what follows, let me try to qualify and extend some of the lessons they are proposing.

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Q&A with FSE visiting scholar and food aid expert Barry Riley.

President Barack Obama’s 2014 budget proposal promises significant food aid reform that will enable the United States to feed about 4 million more people without a significant increase of the current $1.8 billion spent on feeding the world's most hungry. Since the food aid program's inception in 1954, the U.S. has helped feed more than 1 billion people in more than 150 countries, and remains the largest provider of international food aid.

The intention of the reform is to make food aid more efficient, cost effective, and flexible. It aims to use local and regional markets to lower the cost of food and speed its delivery, and calls for the use of cash transfers and electronic food vouchers.

The proposed reforms would also end monetization—the sale of U.S. food abroad to be sold by local NGOs for cash. This practice has been criticized for hurting vulnerable communities by depriving local farmers of the incentives and opportunities to develop their own livelihoods. Several studies, including one by the Government Accountability Office, found monetization to be costly and inefficient—an average of 25 cents per taxpayer dollar spent on food aid is lost.

Barry Riley, a food aid expert and visiting fellow at the Center on Food Security and the Environment, discusses his perspective on the importance of these new reforms, their chances of passage, and the country's current role in international food aid.

Why is local procurement such an important addition to food aid reform?

An increase of funding for local and regional procurement is the most important programmatic element of the proposed reforms. It would help managers working in food security-related development programs to determine for each emergency what commodities are most appropriate and where they can be procured most quickly and inexpensively. Some studies have shown local and regional procurement of food and other cash-based programs can get food to people in critical need 11 to 15 weeks faster at a savings of 25-50 percent. Equally important, local procurement is less likely to disrupt local economic conditions, but rather promote self-sufficiency by increasing demand (often for preferred local staples) and incomes of local producers. The move to 45 percent local (and 55 percent tied) procurement is a BIG step, and one to face strong opposition from American commodity interests and U.S.-flag shippers. 

How difficult is it to ensure vouchers and electronic cash transfers are getting into the hands of people that really need the aid?

Vouchers (and similar urban coupon shops) have been used many times over the past decades as a food transfer mechanism (also sometimes used in food for work programs) enabling the recipient to trade the voucher(s) for foodstuffs when it is most convenient or when they are most needed. Electronic vouchers are new, and how well they work depends on local situations. In places like urban Latin America, Africa and India, it probably could be made to work quite well; the technology is evolving quickly that would enable this sort of transfer mechanism.  

Rural Ethiopia, Burkina Faso, Central African Republic, Malawi – probably not so well. I’m admittedly skeptical that electronic transfers of purchasing power to remote areas would be sufficient in most cases to motivate traders to move food to these hungry areas. Their risks are extremely high and, in my experience in Africa, traders will only deliver food to remote rural areas (inevitably over very bad roads) if they can command prices considerably higher than costs plus a high risk premium.

Why aren’t international food aid organizations more in favor of direct dollar support for local operating costs?

There is (and has long been) opposition among many of the NGOs to the President’s proposal to replace “monetization” with a promise of on-going direct dollar support for the local operating costs of NGO food security-related projects. They believe it will continue to be easier to get Congress to approve money to buy American food commodities to ship overseas than to get approval for dollars to ship overseas, particularly in light of tightening budgets. These NGOs have tended, over the years, to receive a sympathetic ear from Congress.

The proposal shifts oversight of the food aid program from the Agriculture Committees within the U.S. Department of Agriculture (USDA) to the Foreign Affairs/Relations Committees of the State Department’s U.S. Agency for International Development (USAID). What is the likelihood of Congress approving this transfer?

The chance of that happening, in this of all Congresses, is about the same as winning the Power Ball Lottery. Crusty committee chair-people are extremely sensitive to reductions in their empires and the agriculture committees – especially in the Senate – are powerful committees. On top of that, there are so many elements in the overall 2014 federal budget creating heartburn on the Hill that food aid considerations are far, far, far down the line. The best the President is likely to get in the present divided Congress are hearings and a continuing resolution of some sort.

What did you wish to see in the food aid reform proposal that was not addressed in this budget?

Change, if it ever comes, will likely be incremental and halting. I’ll be happy to see any step, however small, in the right direction. The total end of tied procurement would be at the top of my wish list. Even more important, perhaps, iron-clad, multi-year commitments of funding to food security programs intended to overcome long-term institutional impediments to achieving enduring food security in low income food deficit situations…and sticking with such commitments for 15 years.

What role does food aid play in advancing American foreign policy goals?

Most importantly, by being the single largest source of food commodities to the World Food Program in confronting disaster and emergency situations. Food support to American NGOs has been under-evaluated over the past 40 years. I’ll be talking about this later in the book I am writing, but these small projects were all that kept agricultural development (and early food security efforts) going in many small countries during the “dark decades” when international finance institutions and bilateral donors were not financing agricultural development. There are valuable on-the-ground lessons in that NGO food-assisted experience still waiting to be assessed.

Let me add, given what we know about the onset of serious climate change in the decades to come, the need to supply large amounts of food to populations suffering severe food deprivation will probably grow in the future. Where will the food come from and who will pay for those future transfers?

While the U.S. remains the largest provider of food aid, what can the EU and Canada teach the U.S. about food aid policy?

Donors hate to think that other donors have something to teach them. But, of course, they always do. The Canadian and European experience with food aid is best summed up in the way their objective has come to be restated over the past 15 or so years: not “food aid” but “aid for food.” The purpose of assistance intended to improve food security is to improve either, or both, availability and access over the long term (leave nutrition aside for a moment).

European and Canadian assistance can be much more flexible in choosing the instruments – food, cash, technical assistance, training, institutional strengthening, public policy, public-private cooperation, etc. – required to achieve a realistic food security goal which I would describe as pretty good assurance that most people can get their hands on the food they need most of the time. Commodity food aid, in some form – or the promise of its ready availability when needed – will probably need to be part of the total array of inputs required for the several years needed in particular food insecure countries to achieve that “pretty good assurance.” Europe and Canada are closer to understanding this and have become appropriately flexible in concerting resources to get it done. That’s the lesson.

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China’s commitment to agricultural development over the last thirty years has dramatically transformed the country’s economy. Rural income per capita has risen an astounding 20 times after 30 prior years of stagnation. Its poverty rate (US$1.25/day) has dropped from 40 percent to less than five, and 350 million rural people between the ages of 18-65 are now working in the industrial or service sector, enjoying rising wages and new economic opportunities.

This rapid transformation is largely the result of three key agricultural policy decisions: putting land in the hands of farmers, market deregulation, and major public investment in the agricultural sector. Although China must now contend with extreme inequality, high levels of pollution, and an aging farming sector there are still lessons to draw from China’s experience that could hasten the transformation of other developing countries.

China expert and agricultural economist Scott Rozelle broke these lessons down at FSE’s fourteenth Global Food Policy and Food Security Symposium Series last week, opening with an underlying theme of the series.

“Growth and development starts with agriculture,” said Rozelle. “Agriculture provides the basis for sound, sustained economic growth needed to build housing, invest in education for kids, start self-employed enterprises, and finance moves off the farm.”

To prove this point he referenced China’s ‘lost decades’ (1950s-1970s) when 80 percent of the population lived in the rural sector and relied on communal, subsistence agriculture. Poor land rights, weak incentives, incomplete markets and inappropriate investments left the average rural farmer poorer at the end of 70s than they were in the 50s with almost no off-farm employment growth.

So what changed? Incentives, market deregulation and strategic investments by the state were key.

Creating the right incentives

In 1978 the Chinese government broke the communes down into small “family farms” such that every rural resident was allocated a small parcel of land. A family of five farmed an area the size of a football field. While they did not own nor could sell the land, they had the right to choose what crops and inputs they used and the right to the income generated from their land.

“Incentives are important, and can be enough in the short run,” said Rozelle. “Hard work led to money in the pockets of farmers and China was off.”

“Every two and half years China added another California in term of agriculture,” said Rozelle.

Between 1979 and 1985 productivity for wheat, maize, and rice went up 50 percent using the same amount of labor, land and inputs. Agriculture across the spectrum has grown at an astounding rate of 5 percent since 1988 (about four times the population growth rate). Livestock and fisheries have grown even faster – accounting for most of the output of the agricultural sector by 2005.

Income growth from farming enabled family members to begin to seek work off the farm. Between 1980 and 2011, off-farm work increased 71 percent with more than 90 percent of households reporting that at least one family member worked off the farm.

Increasing efficiency through liberalization and investment

Another key policy decision was China’s commitment to market liberalization and investment in public goods.

“Markets can be an effective, pro-poor tool of development,” said Rozelle. “A remarkable partnership is formed when you let farmers do production and government do infrastructure…let markets guide decisions.”

The government dismantled state-owned grain trading companies and deregulated trading rules. Prices were set once a week the same day across China to better integrate markets, and eventually prices for major crops closely mirrored those of world prices. Villages began specializing in crops and livestock and incomes of the poor increased. By not providing government input subsidies (e.g, pesticides, fertilizers), traders were incentivized to participate in the market.

“Giving land to farmers and letting the private sector emerge is an easy thing for governments, even without a lot of money, to do,” said Rozelle.

The government provided more indirect market support by publicly investing in better roads, communications, and surface water irrigation. Groundwater was left to the private sector. There were no water or pumping fees nor subsidies for electricity, keeping it completely deregulated. As a result, 50 percent of cultivated land in China is irrigated, compared to 10 percent in the US and only four percent in sub-Saharan Africa.

Finally, China has invested heavily in agricultural research and development (R&D). One percent of China’s agricultural GDP is now invested in agricultural R&D while US investment has fallen over time. US$2 billion alone goes to investments in Chinese biotechnology.

Despite major investment, China only has one major success story to show for so far. The introduction of Bt cotton led to a significant drop in pesticide use (with important health benefits for farmers), and drop in labor and seed price; resulting in a huge 30 percent increase in net income.

“GM technology benefits exist but big policy decisions still need to be made in the face of much resistance both in China and elsewhere in the world on its application,” said Rozelle.

Status of China’s economy

China has largely solved the country’s macro-nutrient food security problem at the household level (>3000 Kcal/day/person) and millions have been lifted out of poverty. Practically all 16-25 years old are now working off the farm.

“This is a real transformation, and one that could not have happened without a major investment in agriculture,” said Rozelle.

While China’s agricultural accomplishments have been major, Rozelle recognizes the system is far from perfect. For starters, there are serious food safety concerns due to lack of traceability. An astounding 98 percent of Beijing consumers think their food is tainted, said Rozelle.

Water is being pumped like crazy and farmers are aging. The younger generation is neither willing nor interested in following in their parents’ farming footsteps. To make up for a labor deficit farmers are applying huge amounts of fertilizer on their land with serious environmental consequences. As a result of changing demographics and an increasing demand for meat, fish, fruits and vegetables, China is likely to be a net importer of food in the long run.

China also faces major urban and rural inequality issues. Even though wages have risen, inequality has not fallen, largely a result of China’s decision not to privatize rural land.

“Rural people have no assets on which to build wealth while urban people were given assets in the form of housing,” said Rozelle. “Housing prices in major cities in China now rival those in the Bay Area!”

The Chinese government fears losing control of the land, but this comes at a price of less individual incentive to invest and inability to build larger farmers. As agricultural growth slows, Rozelle worries high levels of inequality could lead to instability.

Adding fuel to the fire, investment in rural health, nutrition, and education remains far from sufficient. Only 40 percent of the rural poor go to high school resulting in 200 million people who can barely read or write.

“What’s going to happen in 20 years when low skill manufacturing jobs move to other countries?” asked Rozelle. “The rural, uneducated poor are going to become unemployable.”

China’s record leaves room for improvement, but presents a strong case for supporting smallholder agriculture. For those countries emerging out of their own lost decades, smallholder agriculture should remain a primary focus of investment and development.

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The lost decades for China in the 1950s, 1960s and 1970s look remarkably like the lost decades of Africa in the 1980s and 1990s. Poor land rights, weak incentives, incomplete markets and inappropriate investment portfolios. However, China burst out of its stagnation in the 1980s and has enjoyed three decades of remarkable growth. In this paper we examine the record of the development of China’s food economy and identify the policies that helped generate the growth and transformation of agriculture. Incentives, markets and strategic investments by the state were key. Equally important, however, is what the state did not do. Policies that worked and those that failed (or those that were ignored) are addressed. Most importantly, we try to take an objective, nuanced look at the lessons that might be learned and those that are not relevant for Africa. Many parts of Africa have experienced positive growth during the past decade. We examine if there are any lessons that might be helpful in turning ten positive years into several more decades of transformation.

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Study reveals scale of nitrogen’s effect on people and ecosystems

It’s no secret that China is faced with some of the world’s worst pollution. Until now, however, information on the magnitude, scope and impacts of a major contributor to that pollution – human-caused nitrogen emissions – was lacking.

A new study co-authored by Stanford Woods Institute Senior Fellow Peter Vitousek (Biology) reveals, among other findings, that amounts of nitrogen deposited on land and water in China by way of rain, dust and other carriers increased by 60 percent annually from the 1980s to the 2000s, with profound consequences for the country’s people and ecosystems. Xuejun Liu and Fusuo Zhang at China Agricultural University in Beijing led the study, which is part of an ongoing collaboration with Stanford aimed at reducing agricultural nutrient pollution while increasing food production in China – a collaboration that includes Vitousek and Pamela Matson, a Stanford Woods Institute senior fellow and dean of the School of Earth Sciences. The researchers analyzed all available data on bulk nitrogen deposition results from monitoring sites throughout China from 1980 to 2010.

During the past 30 years, China has become by far the largest creator and emitter of nitrogen globally. The country’s use of nitrogen as a fertilizer increased about threefold from the 1980s to 2000s, while livestock numbers and coal combustion increased about fourfold, and the number of automobiles about 20-fold. All of these activities release reactive nitrogen into the environment. Increased levels of nitrogen have led to a range of deleterious impacts, including decreased air quality, acidification of soil and water, increased greenhouse gas concentrations and reduced biological diversity.

“All these changes can be linked to a common driving factor: strong economic growth, which has led to continuous increases in agricultural and nonagricultural reactive nitrogen emissions and consequently increased nitrogen deposition,” the study’s authors write.

Researchers found highly significant increases in bulk nitrogen deposition since the 1980s in China’s industrialized north, southeast and southwest regions. Nitrogen levels on the North China Plain are much higher than those observed in any region in the U.S., and are comparable to the maximum values observed in the U.K. and the Netherlands when nitrogen deposition was at its peak in the 1980s.

China’s rapid industrialization and agricultural expansion have led to continuous increases in nitrogen emissions and nitrogen deposition. China’s production and use of nitrogen-based fertilizers is greater than that of the U.S. and the E.U. combined. Because of inefficiencies, more than half of that fertilizer is lost to the environment in gaseous or dissolved forms.

China’s nitrogen deposition problem could be brought under control, the study’s authors state, if the country’s environmental policy focused on improving nitrogen agricultural use efficiency and reducing nitrogen emissions from all sources, including industry and transit.

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Scientists are making progress in helping millions of wheat farmers adapt to hotter conditions, but the gains have been uneven, reports a new study led by Stanford University. New approaches to breeding are needed to withstand increasingly common heat waves and keep pace with growing global food demand.

Wheat is the most widely grown crop in the world; unfortunately it is also one of the most sensitive to future global warming. Scientists around the world strive to develop new wheat varieties each year that incorporate improved features, much like car companies release new models each year. Different strategies are commonly used; some target fully irrigated conditions that favor very high yields, while others focus on dry and hot conditions where yield maintenance under stress is a priority.

The team, which includes scientists from Stanford and the International Maize and Wheat Improvement Center (known as CIMMYT), evaluated 25 years of data from historical trials around the globe and analyzed the outcome of different past breeding approaches to help prioritize future strategies. The fully irrigated nursery, known as the elite spring wheat yield trials, produces varieties that are released for the majority of wheat farmers in countries like India and Egypt each year. While cultivars selected under stressed conditions showed significant yield progress at higher temperatures, the elite trials did not.

“There has been very impressive progress in improving yields for the elite varieties at the cooler temperatures that wheat prefers,” explains lead author Sharon Gourdji, a post-doctoral scholar in Stanford’s department of Environmental Earth System Science and Center on Food Security and the Environment (FSE).

“However, to date, our analysis shows a lack of yield gains for these varieties in hot environments over the past 25 years. Along with the gains in cool conditions, this means that the yield difference between cool and hot conditions is getting larger.”

A CIMMYT researcher plants wheat seed in pots in the center's greenhouse facilities. Photo credit: X. Fonseca/CIMMYT

"I think we have learned that the current main approach to breeding won't quite cut it in terms of adapting wheat to climate change,” said co-author David Lobell, assistant professor in Environmental Earth System Science and FSE center fellow. “That is useful information as breeding centers try to raise their game to contend with long-term warming."

Lobell notes that there are good reasons why improved heat tolerance for the elite varieties has not happened naturally.

“Breeding is tough since scientists are aiming for so many traits at once – for example, disease resistance, high yields, and good quality for bread making. Adding heat tolerance is like telling a scout looking for a superstar athlete, ‘by the way, make sure he’s a straight A student’,” said Lobell.

One important lesson from the study is that sifting through historical data can help identify what works and what does not.

“It can often be a hard sell to have breeders take the time to send their data back once they have selected their varieties and moved on,” explains CIMMYT wheat physiologist and co-author Matthew Reynolds. “This study clearly demonstrates the advantage of having these data to assess progress. It shows the genetic potential of wheat to adapt to warmer-than-usual conditions, and reinforces the value of screening under stress as a strategy for adaptation to climate change.”

The progress in the nursery targeted towards stress conditions shows that it is possible to make sizable gains in improving heat tolerance. But whether this can be combined with continued high performance under cooler conditions remains to be seen.

“It is critically important for farmers that they not only survive the bad or hot years, but that they can take full advantage of the favorable years” says Gourdji. “What is needed is a breeding strategy that can successfully achieve both.”

This work was supported by a grant from the Rockefeller Foundation. Additional co-authors of the study include CIMMYT’s Ky Mathews and Jose Crossa.

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