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Switch from corn to grass would raise ethanol output, cut emissions
Date:7/12/2011

CHAMPAIGN, Ill. Growing perennial grasses on the least productive farmland now used for corn ethanol production in the U.S. would result in higher overall corn yields, more ethanol output per acre and better groundwater quality, researchers report in a new study. The switch would also slash emissions of two potent greenhouse gases: carbon dioxide and nitrous oxide.

The study used a computer model of plant growth and soil chemistry to compare the ecological effects of growing corn (Zea mays L.); miscanthus (Miscanthus x giganteus), a sterile hybrid grass used in bioenergy production in Western Europe; and switchgrass (Panicum virgatum L.), which is native to the U.S.

The analysis found that switching 30 percent of the least productive corn acres to miscanthus offered the most ecological advantages.

"If cellulosic feedstocks (such as miscanthus) were planted on cropland that is currently used for ethanol production in the U.S., we could achieve more ethanol (plus 82 percent) and grain for food (plus 4 percent), while reducing nitrogen leaching (minus 15 to 22 percent) and greenhouse gas emissions (minus 29 percent to 473 percent)," the researchers wrote in their report, published in the journal Frontiers in Ecology and the Environment.

"Globally, agriculture contributes about 14 percent of the greenhouse gases that are causing global warming to the atmosphere," said University of Illinois plant biology and Energy Biosciences Institute (EBI) professor Evan DeLucia, who led the study with EBI feedstock analyst Sarah Davis. "The whole Midwest has been, since the advent of modern agriculture, a source of greenhouse gases to the atmosphere."

"According to our model, just by making this replacement you convert that whole area from a source of greenhouse gases to the atmosphere to a si
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Contact: Diana Yates
diya@illinois.edu
217-333-5802
University of Illinois at Urbana-Champaign
Source:Eurekalert  

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