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Comparison of Ropewick Applicators for Control of Johnsongrass (Sorghum halepense) in Cotton (Gossypium hirsutum) with Glyphosate

Published online by Cambridge University Press:  12 June 2017

Paul E. Keeley ,
Charles H. Carter ,
Robert J. Thullen  and
John H. Miller
Paul E. Keeley
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Shafter, CA 93263
Charles H. Carter
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Shafter, CA 93263
Robert J. Thullen
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Shafter, CA 93263
John H. Miller
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Shafter, CA 93263
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Abstract

Three annual applications of glyphosate [N-(phosphonomethyl)glycine] with three ropewick applicators were compared to hoeing and cultivation for the control of johnsongrass [Sorghum halepense (L.) Pers. ♯3 SORHA] in cotton (Gossypium hirsutum L. ‘Acala SJ-2′) in 1980 and 1981. The three applicators provided about equal control of johnsongrass. Averaged over treatments, years, and dates of application, plots treated with glyphosate contained 83% fewer live johnsongrass shoots (14/m2) than cultivated control plots (84/m2) 2 to 3 weeks after each application. Glyphosate-treated plots yielded an average of 81% more seed cotton (2010 kg/ha) than cultivated control plots (1110 kg/ha). However, yields of treated plots averaged 33% less than plots maintained weed-free by hoeing. Although applications of glyphosate reduced johnsongrass populations 83%, the competitive effect of johnsongrass on cotton prior to the initiation of treatments, plus the competition from escape plants between treatments, prevented cotton from yielding normally.

Keywords

Cotton yieldscotton standscotton ginningand cotton fiber properties
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 32 , Issue 4 , July 1984 , pp. 431 - 435
Copyright
Copyright © 1984 by the Weed Science Society of America 

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References

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