Scientists Find Ozone Levels Already Affecting Soybean Yields

Nov 17, 2009 By Stephanie Yao
Scientists Find Ozone Levels Already Affecting Soybean Yields
Current atmospheric ozone levels are already suppressing soybean yields, according to a new study from ARS and cooperators. Photo courtesy of the Department of Energy.

(PhysOrg.com) -- Current atmospheric ozone levels are already suppressing soybean yields, according to Agricultural Research Service (ARS) scientists and university cooperators studying the effect of global climate change on crops.

ARS Don Ort and Carl Bernacchi, molecular biologist Lisa Ainsworth and geneticist Randall Nelson have been working with University of Illinois scientists on a project called “SoyFACE”—short for Soybean Free Air Concentration Enrichment—to measure how the projected increases in carbon dioxide (CO2) and will affect soybean production. This research supports the U.S. Department of Agriculture priority of responding to climate change.

In their studies, the scientists found that soybean yields increase by about 12 percent at the elevated CO2 levels predicted for the year 2050 (550 parts per million)—only half of what previous studies estimated. They also found that increased ozone is quite harmful to soybean yields, reducing them by about 20 percent.

In addition, current levels of ozone are already suppressing by up to 15 percent, according to Ort, who is also research leader of the ARS Research Unit in Urbana, Ill.

These results led the scientists to examine the combined effects of CO2 and ozone changes on soybeans. They found that elevated CO2 partially offsets the ozone damage, confirming general results obtained with open-top chamber studies conducted at other ARS laboratories.

The ability of SoyFACE technology to test effects of CO2 and ozone in the open air, without the environmental modifications caused by the chambers themselves, means greater confidence in understanding how plants respond in the real world, including the actual estimates of impact on crop yields, according to Ort. FACE technology was first used for crop research by ARS scientists in Maricopa, Ariz., and cooperators.

There is much more to be learned about how other interacting factors that affect ozone uptake may come into play by mid-century. Results from these studies will help breeders develop soybean varieties better adapted to the changing climate.

Read more about this research in the November/December 2009 issue of Agricultural Research magazine.

Provided by USDA Agricultural Research Service

Explore further: Research challenges understanding of biodiversity crisis

add to favorites email to friend print save as pdf

Related Stories

Crops and Weeds: Climate Change's First Responders

Nov 11, 2009

(PhysOrg.com) -- A team of Agricultural Research Service (ARS) plant physiologists is studying how global climate change could affect food crop production--and prompt the evolution of even more resilient weeds.

Reducing Agriculture's Climate Change Footprint

Nov 04, 2009

(PhysOrg.com) -- Curbing greenhouse gas emissions from cultivated fields may require going beyond cutting back on nitrogen fertilizer and changing crop rotation cycles, according to research by Agricultural ...

Recommended for you

Plants with dormant seeds give rise to more species

Apr 18, 2014

Seeds that sprout as soon as they're planted may be good news for a garden. But wild plants need to be more careful. In the wild, a plant whose seeds sprouted at the first warm spell or rainy day would risk disaster. More ...

Scientists tether lionfish to Cayman reefs

Apr 18, 2014

Research done by U.S. scientists in the Cayman Islands suggests that native predators can be trained to gobble up invasive lionfish that colonize regional reefs and voraciously prey on juvenile marine creatures.

User comments : 0

More news stories

Atom probe assisted dating of oldest piece of earth

(Phys.org) —It's a scientific axiom: big claims require extra-solid evidence. So there were skeptics in 2001 when University of Wisconsin-Madison geoscience professor John Valley dated an ancient crystal ...