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Glyphosate-Resistant Cotton Response to Glyphosate Applied in Irrigated and Nonirrigated Conditions

Published online by Cambridge University Press:  20 January 2017

C. Dale Monks
Affiliation:
Agronomy and Soils Department, Auburn University
Glenn Wehtje
Affiliation:
Agronomy and Soils Department, Auburn University
Charles Burmester
Affiliation:
Agronomy and Soils Department, Auburn University
Andrew J. Price*
Affiliation:
National Soil Dynamics Laboratory, Agriculture Research Service, U. S. Department of Agriculture, Auburn, AL 36832
Michael G. Patterson
Affiliation:
Agronomy and Soils Department, Auburn University, Auburn, AL 36849
Dennis P. Delaney
Affiliation:
Agronomy and Soils Department, Auburn University, Auburn, AL 36849
Wilson Faircloth
Affiliation:
Agronomy and Soils Department, Auburn University, Auburn, AL 36849
Marshall R. Woods
Affiliation:
Agronomy and Soils Department, Auburn University, Auburn, AL 36849
*
Corresponding author's E-mail: aprice@ars.usda.gov

Abstract

Field experiments were conducted in Alabama during 1999 and 2000 to test the hypothesis that any glyphosate-induced yield suppression in glyphosate-resistant cotton would be less with irrigation than without irrigation. Yield compensation was monitored by observing alterations in plant growth and fruiting patterns. Glyphosate treatments included a nontreated control, 1.12 kg ai/ha applied POST at the 4-leaf stage, 1.12 kg/ha applied DIR at the prebloom stage, and 1.12 kg/ha applied POST at 4-leaf and postemergence directed (DIR) at the prebloom cotton stages. The second variable, irrigation treatment, was established by irrigating plots individually with overhead sprinklers or maintaining them under dryland, nonirrigated conditions. Cotton yield and all measured parameters including lint quality were positively affected by irrigation. Irrigation increased yield 52% compared to nonirrigated cotton. Yield and fiber quality effects were independent of glyphosate treatments. Neither yield nor any of the measured variables that reflected whole plant response were influenced by glyphosate treatment or by a glyphosate by irrigation interaction.

Type
Research
Copyright
Copyright © Weed Science Society of America 

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