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This site is dedicated to helping CCAs find the self-study CEUs they need Ė not just to maintain their certification but to improve their understanding of agronomic principles.

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Weed Management Issues In Continuous Corn
Bruce Erickson; Bill Johnson; Glenn Nice
Crop advisers know that it is not always easy to produce top corn yields, minimize weed control costs, and end up with the kind of weed control that will please not only your customers, but your customer's landlords as well. Typically, growing corn in a rotation with soybeans affords a grower two different sets of weed control systems, one set of herbicides for corn and primarily glyphosate for soybeans. But growers in a continuous corn situation have fewer options, and some additional considerations as well. Many of the herbicides available for use in corn are not exceptional at controlling many tough grass weed species. In addition, corn produces more residue, which can affect herbicide efficacy, as well as create a somewhat different soil temperature/moisture environment that can enhance germination and growth of specific weed species. These two factors not only affect which weeds may become more problematic, but affect the tools you may use to eventually control those weeds. Finally, for growers who rely heavily on postemergence systems, early season weed competition can have a dramatic effect on corn yields. This self-study module provides some insight on each of these factors, and explores specific strategies for some of the most problematic weeds that producers face when growing continuous corn.
 

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