When corn reaches growth stage V3 to V5, the plant transitions from depending on the seed for energy to relying on photosynthesis. Also at this stage, the plant transitions to using the main nodal root system to acquire nutrients from the soil.

Cool, wet soils during this transition period can lead to temporary nutrient deficiencies, resulting in uneven growth and visual deficiency symptoms. While these cosmetic issues can be unsettling for the farmer, the operative word here is "temporary" because...