Wet and cool weather has significantly delayed growth of corn this year. There are several reasons why it is important to recognize that this weather also extended the period for effective application of nitrogen (N). Much of the corn is still at a height that is suitable for normal sidedressing of N. The rainfall responsible for delayed planting and growth probably induced losses of N that normally would be used by the crop. The N-related limitations on yield potential for this crop may be greater than the N-related limitations found on nonfertilized soils in normal years.