Deciding whether or not to replant is one of the most difficult decisions corn producers make. Ultimately, the decision hinges on trying to decide which case will maximize net income. Although results will vary somewhat due to location, season, hybrid, and other factors, Table 1 serves as a good starting point in decision-making. From this base, relative yields for lower stands are suggested. Yields are based on stands that are normal in terms of uniformity of plant size and distribution.
Research indicates that with full stands, uneven plant size and distribution can reduce yield.
This certainly is also a factor in a reduced standbut determining an exact value for this loss, in addition to the loss due to a low stand, is very difficult. Once you have evaluated stand level and uniformity, compare that yield percentage with a full stand at the expected replant date. Convert the difference to bushels per acre. If the replant yield is lower, do not replant. For example, lets say corn is planted on April 25, and the stand goal is 26,000 plants per acre.