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Improved crop production and fewer greenhouse gases

CHESTNUT HILL, MA — Kevin G. Harrison, an assistant professor in Boston College's Geology and Geophysics Department, has published new research on a farming technique that can both increase crop yields and reduce the release of carbons that develop into greenhouse gases. In the book Changing Land Use and Terrestrial Carbon Storage, Harrison and his co-authors, Michelle Segal (BC master's degree in 2003) and Matthew Hoskins (BC bachelor's degree in 2000) of the University of Wyoming, describe the results of a study of various farming techniques and their impact on crop production and the environment.

The researchers studied three different methods of soybean farming: conservation (no-till drilling); conventional tillage, and organic farming. Their findings showed that the conservation method produced the highest crop yield, 15% more than conventional tillage and 110% more than organic farming. It also held the most carbon in the soil--41% more soil carbon than conventional tillage and 48% more than organic. This catching and holding of soil carbon, called sequestration, keeps carbon from being incorporated into carbon dioxide or other greenhouse gases that contribute to global warming.

"Our research suggests that farmers can make decisions about tillage that can helpmitigate the effects of global warming," writes Harrison and his co-authors.

"Switching from a conventional till method to conservation tillage couldproduce 15% more food on the same amount of land," according to the authors. This has serious implications, they write, as the "global population continues to rise and the need to feed more people using less land is becoming more urgent."

For example, the conservation technique would use 52% less land than the organic method to produce the same amount of soybeans.

The research was conducted on a farm in Brighton, Iowa and supported by the U.S. Department of Agriculture and Boston College.

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Contact: Kathleen Sullivan
kathleen.sullivan.1@bc.edu
617-552-8644
Boston College
29-Mar-2004


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