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Title: Cotton (Gossypium hirsutum) Response to Glyphosate Applied in Irrigated and Non-irrigated Conditions

Author
item MONKS, DALE - AUBURN UNIVERSITY
item WEHTJE, GLENN - AUBURN UNIVERSITY
item BURMESTER, CHARLES - AUBURN UNIVERSITY
item Price, Andrew
item PATTERSON, MICHAEL - AUBURN UNIVERSITY
item DELANEY, DENNIS - AUBURN UNIVERSITY
item Faircloth, Wilson
item WOODS, MARSHALL - AUBURN UNIVERSITY

Submitted to: Weed Technology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/1/2007
Publication Date: 10/1/2007
Citation: Monks, D.C., Wehtje, G., Burmester, C., Price, A.J., Patterson, M.G., Delaney, D.P., Faircloth, W.H., Woods, M.R. 2007. Cotton (gossypium hirsutum) response to glyphosate applied in irrigated and non-irrigated conditions. Weed Technology. 21:915-921.

Interpretive Summary: Field experiments were conducted to evaluate glyphosate-induced yield suppression in glyphosate-tolerant cotton. Glyphosate treatments included a non-treated control, glyphosate applied postemergence at the 4-leaf stage, glyphosate applied as a directed spray at the pre-bloom stage, and glyphosate applied sequentially at the 4-leaf and pre-bloom cotton stages. The second variable, irrigation treatment, was established by irrigating plots individually with overhead sprinklers or maintaining them under dryland, non-irrigated conditions. Cotton yield and all measured parameters including lint quality were positively affected by irrigation. Irrigation increased yield 52% compared to non-irrigated 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 nor by a glyphosate by irrigation interaction.

Technical Abstract: Field experiments were conducted in Alabama during 1999 and 2000 to test the hypothesis that any glyphosate-induced yield suppression in glyphosate-tolerant cotton would be less with irrigation compared to without irrigation. This objective was best served by measuring for possible yield-compensating alterations in plant growth and fruiting patterns. Glyphosate treatments included a non-treated control, 1.12 kg a.i./ha applied POST at the 4-leaf stage, 1.12 kg/ha applied DIR at the pre-bloom stage, and 1.12 kg/ha applied sequentially at the 4-leaf and pre-bloom cotton stages. The second variable, irrigation treatment, was established by irrigating plots individually with overhead sprinklers or maintaining them under dryland, non-irrigated conditions. Cotton yield and all measured parameters including lint quality were positively affected by irrigation. Irrigation increased yield 52% compared to non-irrigated 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 nor by a glyphosate by irrigation interaction.