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University of Minnesota Extension

Extension is expanding its online education and resources to adapt to COVID-19 restrictions.

Growing corn

Corn growth stages

Corn growth and development stages

Understanding how corn grows and develops is important, since the crop stage will impact management decisions around crop damage, pesticide applications and harvest.  

Nutrient management

Corn nutrient needs

Includes links to fertilizing corn, banding fertilizer and the corn nitrogen rate calculator.


Understand how nitrogen behaves in soil, fertilizer rates by crop, how to apply urea and minimize losses, and best practices for soil testing

Pre-sidedress nitrate soil test (PSNT)

The (PSNT) is a tool for deciding whether or not a supplemental nitrogen application might be needed. The soil samples are typically taken in June around the V6 growth stage prior to sidedressing N.  

Best practices for taking PSNT samples


Best practices for handling PSNT samples


Crop and weather damage

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