Agronomy Tip: Calculate Growth and Development of Crops

Overall health and consistency is key for growth and development of your crops. However, during some years, growth may be short due to poor weather conditions. That doesn’t always mean development will suffer too.

Growing Degree Days and Growing Degree Units refer to the same calculation based on air temperature. In the case of corn, the equation is:

  • GDD or GDU = (Daily Maximum Air Temperature + Daily Minimum Temperature)/2 – 50

The University of Wisconsin determines a base line of 125 GDUs required for corn emergence. This range is dependent on adequate soil moisture and will vary with planting depth, tillage system, residue cover, and weather events.

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