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Response of Double-Crop Glyphosate-Resistant Soybean (Glycine max) to Broadleaf Herbicides

Published online by Cambridge University Press:  20 January 2017

Ronald F. Krausz*
Affiliation:
Department of Plant, Soil, and General Agriculture, Southern Illinois University, Carbondale, IL 62901
Bryan G. Young
Affiliation:
Department of Plant, Soil, and General Agriculture, Southern Illinois University, Carbondale, IL 62901
*
Corresponding author's E-mail: [email protected].

Abstract

Field studies were conducted from 1997 to 1999 to evaluate the influence of broadleaf herbicides on double-crop glyphosate-resistant soybean injury and yield at Belleville, IL. Diphenylether herbicides applied postemergence (POST) caused 10 to 48% necrosis 7 days after treatment (DAT). POST herbicides caused 0 to 8%, 8 to 37%, and 0 to 12% height reduction 7 DAT in 1997, 1998, and 1999, respectively. In most instances, diphenylether herbicides did not delay soybean maturity, whereas imazethapyr applied POST delayed soybean maturity in 1998 and 1999. Acifluorfen plus bentazon reduced soybean height at maturity in 1997 and 1998, whereas lactofen, imazethapyr, and imazamox reduced height only in 1998. Diphenylether herbicides did not reduce grain yield when compared to the no-herbicide hand-weeded treatment, but imazamox reduced yield by 18%. Furthermore, the soil herbicides applied preemergence and diphenylether herbicides applied POST did not reduce grain yield when compared to glyphosate alone.

Type
Research
Copyright
Copyright © Weed Science Society of America 

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