Results presented in this format may be difficult to analyze, since grain yield differences between hybrids often are subtle or variable. Variability in hybrid testing can be expected due to the complexity of interacting factors that influence grain yield, coupled with the number of entries grown in the tests. Give careful attention to yield relative to the test average. It is highly recommended to yield-test several promising hybrids alongside established standard hybrids on your farm. This lets you evaluate your own soil types and cropping systems.
Hybrid maturity is a major consideration in hybrid selection.
Maturity is most commonly expressed as a number of days needed to reach physiological maturity. This method can be rather arbitrary due to variability of environmental influence on physiological development. Hybrids currently marketed normally range from 110 to 125 days, or 2,700 to 3,100 GDU's. Late-maturing hybrids generally have more yield potential than do the early maturing hybrids. However, early maturing hybrids often yield favorably to late-maturing hybrids, especially under stressed conditions.