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Annual Weed Control by Glyphosate in Glyphosate-Resistant Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

Comfort M. Ateh*
Affiliation:
Department of Agronomy, University of Wisconsin, Madison, WI 53706
Robert G. Harvey
Affiliation:
Department of Agronomy, University of Wisconsin, Madison, WI 53706
*
Corresponding author: C. M. Ateh.

Abstract

Control of natural infestations of common lambsquarters and giant foxtail in 1993, 1994, and 1995 and of velvetleaf in 1994 and 1995 by postemergence application of glyphosate to glyphosate-resistant soybean planted in narrow (20 cm) and wide (76 cm) rows was evaluated. Planting glyphosate-resistant soybean in narrow rows and applying reduced rates of glyphosate when common lambsquarters, giant foxtail, and velvetleaf were at their actively growing stage 3 to 18 cm, 5 to 28 cm, and 3 to 20 cm tall, respectively, resulted in > 90% control. The effect of time of herbicide application was greater than the rate of herbicide application, especially within the wide-row soybean plantings. Applying imazethapyr in combination with glyphosate did not improve weed control or soybean yield compared with glyphosate alone.

Type
Research
Copyright
Copyright © 1999 by the Weed Science Society of America 

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Footnotes

Current address of first author: Department of Vegetable Crops, 124 Robbins Hall, University of California, Davis, CA 95616.

References

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