Based on research and in-field experience, we are confident yields are reduced when corn follows corn in Iowa cropping systems. The question many ask though is why? What are the causes? Some point to allelopathy and wonder if this is the major cause. Researchers have examined this specific question over the last two decades. We will discuss some of their research findings in this article.
Iowa State University
Elmore, Roger W. and Abendroth, Lori, "Allelopathy: A cause for yield penalties in corn following corn?" (2007). Integrated Crop Management News. 1158.
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