FREDERICKSBURG, IA - AUGUST 17:  Corn grows on a farm August 17, 2011 near Fredericksburg, Iowa. High grain prices and increasing yields have been an economic windfall for farmers who saw an average 27 percent increase in net income last year and are expected to see another 20 percent this year. Low stockpiles, the use in ethanol production and orders from China have driven up demand and are expected to keep corn prices high. Ethanol production is expected to overtake livestock as the top corn consumer this year.   (Photo by Scott Olson/Getty Images)