Results of state corn performance trials provide detailed comparisons of hybrids for different characteristics across a wide range of environmental conditions. However, local corn hybrid demonstration plots can be useful in providing information on certain hybrid traits, especially those that are not usually reported in state corn performance summaries. There are a number of these plots established each year by various seed companies, county Extension personnel, and local FFA clubs.
Many growers also conduct on-farm tests to evaluate hybrids under their own conditions.
The following are some of the genetic characteristics to observe during the growing season that can influence a hybrid's overall performance and yield potential. During the tasseling and pollination period, determine the difference between hybrids in date of tassel and silk emergence. Planting a range of hybrids with different silking maturity dates may help spread the risk of heat or moisture stress occurring during flowering. Silks should emerge from the ear shoots within a day or two after the beginning of pollen shed. Silk emergence in corn is often delayed when plants are subjected to considerable moisture stress.