File - A July 19, 2012 file photo shows a corn field at sun rise near Springfield, Neb. The USDA is releasing its first estimate of the 2013 crop size in its spring planting report on Thursday, March 28, 2013. (AP Photo/Nati Harnik, file)

Associated Press
File -  A July 19, 2012 file photo shows a corn field at sun rise near Springfield, Neb. The USDA is releasing its first estimate of the 2013 crop size in its spring planting report on Thursday, March 28, 2013. (AP Photo/Nati Harnik, file)
File - A July 19, 2012 file photo shows a corn field at sun rise near Springfield, Neb. The USDA is releasing its first estimate of the 2013 crop size in its spring planting report on Thursday, March 28, 2013. (AP Photo/Nati Harnik, file)
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