Reduce other crops for Corn

From Cato

"Primarily derived from corn in the United States, ethanol affects the price of corn directly by adding to demand, and other commodities indirectly by drawing cropland away from their production. Indeed, in the last year the supply of corn has increased 24 percent in the northern United States during 2007, primarily because of higher corn acreage (the highest since 1933). Ethanol capacity has risen by around 40 percent in the last year because of government incentives. As farmers shifted production to meet surging demand for ethanol, the acreage devoted to rice, cotton and soybeans has decreased by 3 percent, 18 percent, and 16 percent respectively."

Repeating
Rice down 3%
Cotton down 18%
Soybeans down 16%