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Weed Management in Narrow- and Wide-Row Glyphosate-Resistant Soybean (Glycine max)

Published online by Cambridge University Press:  20 January 2017

Bryan G. Young ,
Julie M. Young ,
Lisa C. Gonzini ,
Stephen E. Hart ,
Loyd M. Wax  and
George Kapusta
Bryan G. Young*
Affiliation:
Southern Illinois University, Carbondale, IL 62901
Julie M. Young
Affiliation:
Southern Illinois University, Carbondale, IL 62901
Lisa C. Gonzini
Affiliation:
University of Illinois, Urbana, IL 61801
Stephen E. Hart
Affiliation:
University of Illinois, Urbana, IL 61801
Loyd M. Wax
Affiliation:
U.S. Department of Agriculture, Agricultural Research Service, University of Illinois, Urbana, IL 61801
George Kapusta
Affiliation:
Southern Illinois University, Carbondale, IL 62901
*
Corresponding author's E-mail: bgyoung@siu.edu.
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Abstract

Field experiments were conducted over 3 yr at three locations in Illinois to evaluate the efficacy of glyphosate in glyphosate-resistant soybean planted in rows spaced 19, 38, and 76 cm. Minimal soybean injury (less than 10%) was observed from any glyphosate treatment. Glyphosate treatments controlled 82 to 99% of giant foxtail. Common waterhemp control was increased as soybean row spacing was decreased. Applying sequential glyphosate applications or increasing the glyphosate rate from 420 g ae/ha to 840 g/ha frequently increased common waterhemp control in 76-cm rows. Velvetleaf control with glyphosate was variable, ranging from 48 to 99%. Decreasing soybean row spacing, utilizing sequential glyphosate applications, or increasing the glyphosate rate improved velvetleaf control in at least four of eight site-years. Glyphosate treatments generally resulted in weed control and soybean yield equal to or greater than the standard herbicide treatments. However, glyphosate treatments yielded less than the hand-weeded control in four of eight site-years, suggesting that weed control from glyphosate treatments was sometimes inadequate.

Keywords

Glyphosatecommon waterhemp, Amaranthus rudis Sauer #3 AMATAgiant foxtail, Setaria faberi Herrm. # SETFAvelvetleaf, Abutilon theophrasti Medik. # ABUTHsoybean, Glycine max (L.) MerrHerbicide-resistant cropsEPOST, early postemergenceLPOST, late postemergenceMPOST, mid-postemergenceNIS, nonionic surfactantUAN, 28% urea ammonium nitrateWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 15 , Issue 1 , March 2001 , pp. 112 - 121
Copyright
Copyright © Weed Science Society of America 

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