Successful corn production requires the selection of the correct hybrids for the production environment. Farmers need to consider yield potential, maturity, pest resistance, and harvestability when selecting hybrids. Proper maturity is important so that the amount of drying necessary after harvest is minimized. High-yielding hybrids whose maturities take full advantage of the available growing season are generally the most energy-efficient choices (Eckert et al., 1987). A hybrid which matures far in advance of anticipated harvest does not make full use of available solar radiation, and therefore does not realize the full yield potential of the growing season and the energy related inputs provided by the farmer. Conversely, a hybrid that is not mature at the time of frost can increase artificial drying costs, in addition to not achieving full yield potential because it was killed before grain filling was complete.