2007 Student Research Conference:
20th Annual Student Research Conference


Evaluation of weed emergence patterns and the effect of weed removal on soybean Yield
Sara R. Copp
Dr. Michael Seipel, Faculty Mentor

Data on soybean yield and economic returns were collected as part of the third year of a weed removal trial in Rochester, Minnesota. The major weeds in soybean are Common Lambsquarters, Common Waterhemp, Giant Ragweed, and Giant Foxtail. This trial compared the glyphostate applied at five intervals based on weed height. Combined pre/post-emergence treatment at five inch weed height produced the highest yield. Pre-emergence application gives a larger window of opportunity for post-emergence application, plus the pre-herbicide, Boundary, provides residual control whereas the glyphosate does not. Because post-application alone resulted in similar yields, it is potentially more profitable, but narrows the application window.

Keywords: Soybean Yield, Economic Returns, Weed Removal Trial, Pre/Post-emergence, glyphosate, weed height, highest yield

Topic(s):Agricultural Science

Presentation Type: Oral Paper

Session: 62-4
Location: VH 1432
Time: 3:30 pm

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