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Cotton (Gossypium hirsutum) Response to Glyphosate Spot Applied

Published online by Cambridge University Press:  12 June 2017

R. Brent Westerman  and
Don S. Murray
R. Brent Westerman
Affiliation:
Dep. Agron., Okla. State Univ., Stillwater, OK 74078
Don S. Murray
Affiliation:
Dep. Agron., Okla. State Univ., Stillwater, OK 74078
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Abstract

Weed free field experiments were conducted for 3 yr at one location to measure the response of cotton to glyphosate spot applied once, twice, and three times. Glyphosate treatments frequently used for silverleaf nightshade control were applied at specified intervals after cotton emergence to in-row, uniformly spaced densities of “simulated” weeds. The number and application timing influenced cotton injury each year. Frequently, cotton lint yields following treatments applied once at four, six, or eight sites/9 m of row were not reduced significantly compared to the untreated plots; however, average yield reductions ranged from 10 to 14%. Glyphosate, applied more than once generally, caused more crop injury and reduced lint yields by 13 to 39%.

Keywords

Glyphosate, N-(phosphonomethyl)glycinecotton, Gossypium hirsutum L., ‘Paymaster 145’, and ‘Westburn M’silverleaf nightshade, (Solanum elaeagnifolium Cav. ♯3 SOLELTiming of applicationcrop responseweed densitiessimulated weedSOLEL
Type
Research
Information
Weed Technology , Volume 4 , Issue 4 , December 1990 , pp. 759 - 764
Copyright
Copyright © 1990 Weed Science Society of America 

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References

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