It should come as no surprise that the week of July 23 was a hot one in all of Iowa. We effectively gained an extra day and a half of heat compared with long-term averages in all parts of Iowa. Mind you that as corn and soybean are in the fill stage, degree days themselves aren't as important as they were in the leadup to pollination. Now we look at stresses on plants, and we do have variable moisture and accompanying heat stress in many parts of Iowa.
Iowa State University
Pope, Richard O., "The heat (has been) on!" (2006). Integrated Crop Management News. 1326.
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