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Field Performance of Glyphosate as Influenced by Selected Adjuvants and a Low-Volume, Air-Assisted Sprayer

Published online by Cambridge University Press:  20 January 2017

Wilson H. Faircloth ,
Michael G. Patterson ,
Sidney B. Belcher ,
Jason C. Sanders  and
Daniel O. Stephenson IV
Wilson H. Faircloth*
Affiliation:
Department of Agronomy and Soils, Auburn University, AL 36849
Michael G. Patterson
Affiliation:
Department of Agronomy and Soils, Auburn University, AL 36849
Sidney B. Belcher
Affiliation:
Department of Agronomy and Soils, Auburn University, AL 36849
Jason C. Sanders
Affiliation:
Department of Agronomy and Soils, Auburn University, AL 36849
Daniel O. Stephenson IV
Affiliation:
Department of Agronomy and Soils, Auburn University, AL 36849
*
Corresponding author's E-mail: wfairclo@acesag.auburn.edu
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Abstract

Field studies were conducted at the Alabama Agricultural Experiment Station near Shorter, AL, from 1998 to 2000 to evaluate six commercial spray adjuvants and their effects on glyphosate applied to cotton with an air-assisted sprayer. Each adjuvant was evaluated with a conventional sprayer calibrated to deliver 94 L/ha solution and a low-volume, air-assisted sprayer calibrated to deliver 19 L/ha solution. Glyphosate was applied to two-leaf pitted and entireleaf morningglory growing in glyphosate-resistant cotton. Visual control of pitted and entireleaf morningglory was more dependent on the rate of herbicide application than on a particular adjuvant or sprayer, with glyphosate at 0.42 kg ae/ha providing 70% control 21 d after treatment. Pitted and entireleaf morningglory biomass measurements generally reflected visual control data. Ammonium sulfate and formulated glyphosate consistently gave the highest visual control and the greatest biomass reduction. Glyphosate application rate was more important than adjuvant addition or sprayer type, with the higher rates of application providing greater control. No differences in weed control were observed between spray systems; therefore, air-assisted sprayers may be used on a field-scale basis with consistent and adequate results.

Keywords

Glyphosateentireleaf morningglory, Ipomoea hederacea var. integriuscula Gray # IPOHEpitted morningglory, Ipomoea lacunosa L. # IPOLAcotton, Gossypium hirsutum L. ‘Paymaster 1220BG/RR’Glyphosate-resistant cottonIPOHEIPOLAsurfactantAMS, ammonium sulfateCOC, crop oil concentrateDAT, days after treatmentGLY+, formulated glyphosateNIS-1, nonionic surfactantNIS-2, nonionic wetter–spreader–penetrantNIS-3, nonionic surfactant–penetrant–acidifierPOST, postemergencePPI, preplant incorporatedWCA, water conditioning agent
Type
Note
Information
Weed Technology , Volume 18 , Issue 2 , June 2004 , pp. 458 - 463
Copyright
Copyright © Weed Science Society of America 

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