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 r

 

              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 r
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)
Tags: USDA , corn