Chris Hurt testified Thursday before the US House of Representatives Energy and Power Subcommittee.
Nearly 80 percent of Indiana's corn has been rated good or excellent.
After Congress failed to pass a new version of the farm bill, Purdue agriculture economists say they expect another farm bill extension.
A computer simulation of the corn belt shows corn yields are likely to decline over the next several decades.
The effect of last summer's drought on livestock around the state could be felt for several more years, says one economist.
The dry weather ravaged feed supplies, sharply drove up corn and soybean prices and forced cattle producers to reduce their herds.