This winter there has been a lot of information in the media and on the web regarding soybean planting date. In part, the reason is that a paper was published in the Agronomy Journal by two researchers from University of Kentucky stating that there is no consistent advantage for planting soybean early in the United States, but it is first after late May and early June that yields start to drop off. That is NOT correct for Iowa and is not correct for many of the states adjacent to Iowa as well.
Iowa State University
Pedersen, Palle, "Early planting IS important in Iowa" (2009). Integrated Crop Management News. 687.
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