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United States Department of Agriculture

Agricultural Research Service

Research Project: QUANTIFYING AND MONITORING NUTRIENT CYCLING, CARBON DYNAMICS AND SOIL PRODUCTIVITY AT FIELD, WATERSHED AND REGIONAL SCALES

Location: Hydrology and Remote Sensing Laboratory

Title: Impact of shifting crop production for biofuel demand on soil and water quality

Authors
item Beeson, Peter
item Sadeghi, Ali
item Daughtry, Craig
item Tomer, Mark
item Di Luzio, Mauro
item Arnold, Jeffrey

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: August 8, 2011
Publication Date: August 12, 2012
Citation: Beeson, P.C., Sadeghi, A.M., Daughtry, C.S., Tomer, M.D., Di Luzio, M., Arnold, J.G. 2012. Impact of shifting crop production for biofuel demand on soil and water quality [abstract]. ASABE Conference. Paper No. 1111162, p.45.

Technical Abstract: The impact of shifting cropping systems to dominantly corn for biofuels, in particular ethanol production, could have serious implications on soil and water quality. Proper land management for biofuels production in agriculture is critical to achieve because of maintaining the sustainability of land resources. The South Fork of the Iowa River, for example, covers about 780 square-kilometers (193,000 ac) and is one of 15 benchmark watersheds of the USDA Conservation Effects Assessment Project (CEAP). The South Fork is historically 80-86% agricultural land with mainly either corn or soybean cultivation. In 2000, the watershed was 44% corn and 41% soybean, since then the disparity has grown and the maximum difference is seen in 2007 when the watershed was 59% corn and 21% soybean. We are using SWAT and APEX- two watershed and field process based models- in combination to track changes in soil and water quality due to the increased fertilizer application and field operations resulting from the shift from corn-soybean rotation to continuous corn. The average annual nitrate load trends upward, with a maximum difference of 125% (2005 to 2007); however, this increase also corresponds to a large increase in annual rainfall. Furthermore, some agricultural areas could see a switch to strictly corn production in order to meet federal ethanol production goals. This scenario was also simulated to show the impacts to soil and water quality from large-scale expansion of corn cultivation.

Last Modified: 11/26/2014
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