Many believe that the planting date for soybean is not as important as it is for corn. That is not the case. There is a yield benefit for planting early despite cold soil temperatures that slow plant growth during the seedling phase. The optimum time to plant soybean varies from year to year and from region to region. Numerous factors influence the decision on when to start planting soybean.
Iowa State University
Pedersen, Palle, "Soybean planting date" (2006). Integrated Crop Management News. 1217.
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