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Competitiveness with Weeds of Soybean Cultivars with Different Maturity and Canopy Width Characteristics

Published online by Cambridge University Press:  20 January 2017

Dawn E. Nordby ,
Dustin L. Alderks  and
Emerson D. Nafziger
Dawn E. Nordby*
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
Dustin L. Alderks
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
Emerson D. Nafziger
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
*
Corresponding author's E-mail: dnordby@uiuc.edu
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Abstract

Field studies were conducted in 2005 at five locations throughout Illinois to determine the effect of maturity date and canopy width characteristics of selected glyphosate-resistant soybean cultivars on competitive ability against weeds. Natural weed populations at all sites were allowed to compete with the soybean cultivars until the V1, V3, V5, or V7 growth stage and then removed with an application of glyphosate. Light-interception readings, weed control ratings, and soybean yield were all measured to compare cultivars. Cultivars of later maturities tended to withstand early season weed competition better and attained higher yields when weeds were removed at later timings than those of earlier maturity. Although canopy width differed moderately among cultivars in some cases, canopy width had no effect on the ability of soybeans to compete with weeds. Thus, choosing soybean cultivars of later maturity might provide more flexibility in weed management and might reduce losses due to weeds, but that benefit needs to be balanced with yield potential.

Keywords

Glyphosatemetolachlormetribuzinsoybean, Glycine max (L.) MerrApplication timingweed-free period
Type
Research
Information
Weed Technology , Volume 21 , Issue 4 , December 2007 , pp. 1082 - 1088
Copyright
Copyright © Weed Science Society of America 

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