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Influence of Weed Competition and Herbicides on Glyphosate-Resistant Soybean (Glycine max)

  • Ronald F. Krausz (a1), Bryan G. Young (a1), George Kapusta (a1) and Joseph L. Matthews (a1)


Field studies were conducted from 1997 to 1999 to evaluate the influence of weed competition and herbicides on glyphosate-resistant soybean at the Belleville Research Center at Belleville, IL. Season-long weed competition did not delay maturity or reduce soybean population. However, season-long weed competition reduced soybean height by 10% and grain yield by 68%. Competition from weeds 30 cm in height or less did not increase days to maturity or reduce plant population, height, or grain yield. Chlorimuron plus thifensulfuron caused 6% height reduction at 21 d after treatment. Despite the injury from herbicides, none increased days to maturity or reduced plant height, population, or grain yield of soybean. The soil-applied herbicides alachlor, imazaquin, and pendimethalin and the postemergence herbicides acifluorfen, bentazon, chlorimuron, imazethapyr, and thifensulfuron did not reduce yield of glyphosate-resistant soybean.


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Influence of Weed Competition and Herbicides on Glyphosate-Resistant Soybean (Glycine max)

  • Ronald F. Krausz (a1), Bryan G. Young (a1), George Kapusta (a1) and Joseph L. Matthews (a1)


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