Degree days are a critical driver of crop development, and 2009 certainly illustrates that point. Wet soils and cool early season temperatures delayed some plantings and also delayed the development of crops that were planted on time. The early vegetative stages were slowed by cooler-than-normal temperatures, then July arrived with a remarkably un-summerlike chill that lasted the whole month.
Iowa State University
Pope, Richard O. and Taylor, S. Elwynn, "The 2009 Season in Degree Days Through Late August" (2009). Integrated Crop Management News. 570.
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