This photo from Aug. 1, 2012, shows a drought damaged ear of corn in Westfield, Ind., corn field. U.S. corn growers could have their worst crop in a generation as the harshest drought in decades takes its toll, the government reported Friday, Aug. 10, 2012, as it forecast the lowest average yield in 17 years. (AP Photo/Michael Conroy, File)

Associated Press
This photo from Aug. 1, 2012, shows a drought damaged ear of corn in Westfield, Ind., corn field. U.S. corn growers could have their worst crop in a generation as the harshest drought in decades takes its toll, the government reported Friday, Aug. 10, 2012, as it forecast the lowest average yield in 17 years.  (AP Photo/Michael Conroy, File)
This photo from Aug. 1, 2012, shows a drought damaged ear of corn in Westfield, Ind., corn field. U.S. corn growers could have their worst crop in a generation as the harshest drought in decades takes its toll, the government reported Friday, Aug. 10, 2012, as it forecast the lowest average yield in 17 years. (AP Photo/Michael Conroy, File)
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