Soybean are nearing maturity across Iowa with minimal delay due to cool temperatures compared to 2016. However, soybean sensitivity to day length speeds up crop development towards physiological maturity. During senescence carbohydrates are converted into oils. Soybean seed moisture changes very little, remaining near 60 percent during the de-greening period. As the pods turn to mature color at the beginning of maturity stage (R7), seed dry matter accumulation is complete and seed moisture rapidly decreases.
Iowa State University
Archontoulis, Sotirios and Licht, Mark, "How Fast do Soybeans Dry Down in the Field?" (2017). Integrated Crop Management News. 2476.
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