How much rainfall will leach nitrogen in corn?

Agronomic news
March 21, 2025

Source: OMAFRA Field Crop News

Heavy rainfall can cause nitrates to move down through the soil and possibly below the corn crop’s root zone where it is less available for uptake. How much rainfall is needed to leach nitrogen (N)? Should we be applying extra N to corn to cover losses if a lot of rainfall has occurred in July and August? At the 2023 Southwest Crop Diagnostic Days they did an experiment to see how much water was needed to move nitrates. Read more on the experiment from this Field Crop News article.

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