By this time last year, 26 percent of the country's corn crop was already planted. A wet, cold spring means that only 4 percent is in the ground right now. Seth Perlman/AP hide caption

toggle caption Seth Perlman/AP
For Corn, Fickle Weather Makes For Uncertain Yields
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A corn field is shrouded in mist at sunrise in rural Springfield, Neb. Nati Harnik/AP hide caption

toggle caption Nati Harnik/AP

President Obama and Agriculture Secretary Tom Vilsack (second from right) inspect drought-damaged corn on the McIntosh farm in Missouri Valley, Iowa. Carolyn Kaster/AP hide caption

toggle caption Carolyn Kaster/AP