This file photo from July 19, 2012, shows a corn field on a foggy morning near Springfield, Neb. The USDA is releasing its first estimate of the 2013 crop size in its spring planting report on ... more 
This file photo from July 19, 2012, shows a corn field on a foggy morning 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) less 
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Associated Press | Photo By Nati Harnik
Thu, Mar 28, 2013 12:25 PM EDT