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Interactions of Glyphosate with Residual Herbicides in No-Till Soybean (Glycine max) Production1

Published online by Cambridge University Press:  20 January 2017

Lawrence A. Vanlieshout*
Affiliation:
Department of Horticulture and Crop Science, Ohio State University, Columbus, OH 43210
Mark M. Loux
Affiliation:
Department of Horticulture and Crop Science, Ohio State University, Columbus, OH 43210
*
Corresponding author's address and E-mail: 955 Elm Street, Wilmington, OH 45177; lvanlieshout@in-touch.net.

Abstract

Glyphosate is often mixed with residual herbicides to control emerged weeds in no-till crop production systems. Field studies were conducted in Ohio from 1992 to 1994 to evaluate the weed control provided by residual herbicides and reduced rates of glyphosate in full-season, no-till soybean. Herbicide treatments were applied at two timings to examine the effect of weed size. At 4 wk after treatment, greater than 85% Pennsylvania smartweed control was obtained with metribuzin plus chlorimuron and linuron plus chlorimuron applied with 280 g ai/ha glyphosate and with imazethapyr and imazaquin applied with 560 g/ha glyphosate. All residual herbicides provided at least 85% common lambsquarters control when applied with 560 g/ha glyphosate. In 1992, the early application of residual herbicides provided this level of common lambsquarters control without glyphosate due to the small weed size at the time of application. Residual herbicides applied with 280 g/ha glyphosate controlled giant foxtail 85% or greater. Higher glyphosate rates were needed to control barnyardgrass. The performance of reduced glyphosate rates was dependent on weed species and weed size.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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