For Wheat, the timing of growth stage progressions through the season is dependent on both the variety and environmental cues such as day length, or temperature. The Wheat (Hard Red) growing degree day model, developed by Montana State University, uses heat units and time as a method to estimate plant phenological stages through the growing season. This can be helpful as a crop management tool, or to predict harvest timing of Hard Red Wheat.
Calculating Growing Degree Days
For this model, a lower temperature threshold of 32F is used to calculate growing degree day accumulation beginning at the time of planting. Growing degree days can be calculated from daily high and low temperatures, or via the Pest Prophet app, which uses hourly temperature data for a given field. This can be used to predict stages of plant development, flower emergence and grain hardening, which will occur at approximately 2930 GDD (F).
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