Determining the amount of supplemental nitrogen, if any, that is needed after saturated soil conditions is a difficult question to answer. Soil conditions such as texture, temperature, and length of saturation plus nitrogen application factors timing, placement, source, inhibitors used along with the growth stage of corn which impacts the amount of N already taken up, affect the decision to apply additional N.

University of Minnesota Extension explains the nitrogen cycle, how nitrogen can transform and end up leaving the soil through the atmosphere or local waterways.