A third straight week of cooler than average weather has slowed crop progress across Iowa. Sporadic rainfall has limited field work, and for many fields weeds are a growing concern (pun intended). There has been slow weed response to herbicides, especially with glyphosate. The answer to this lies in getting some warmer weather to stimulate growth. So patience is a virtue.
Iowa State University
Pope, Richard O., "Degree Days - Cool Weather Continues" (2009). Integrated Crop Management News. 627.
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