FILE - A July 19, 2012 file photo shows a corn field being shrouded by fog near Springfield, Neb. The USDA is releasing its first estimate of the 2013 crop size in its spring planting r

 

              FILE - A July 19, 2012 file photo shows a corn field being shrouded by fog near Springfield, Neb. The USDA is releasing its first estimate of the 2013 crop size in its spring planting r
FILE - A July 19, 2012 file photo shows a corn field being shrouded by fog 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)
Tags: USDA , corn