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Full-season Palmer amaranth (Amaranthus palmeri) interference with cotton (Gossypium hirsutum)

Published online by Cambridge University Press:  12 June 2017

Matt W. Rowland ,
Don S. Murray  and
Laval M. Verhalen
Matt W. Rowland
Affiliation:
Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 74078
Laval M. Verhalen
Affiliation:
Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 74078
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Extract

Four field experiments were conducted in Oklahoma to measure full-season Palmer amaranth interference on cotton lint yield and fiber properties. Density of the weed ranged from 0 to 12 plants 10 m−1 of row. Cotton lint yield vs. weed density fit a linear model for densities ⩽ 8 weeds row−1 at Perkins and Chickasha in 1996 and at Alms in 1997. At Perkins in 1997, all densities fit a linear model. For each increase of 1 weed row−1, lint yield reductions were 62 kg ha−1 (or 10.7%) and 58 kg ha−1 (or 11.5%) at Perkins and at Chickasha in 1996, respectively. At Perkins and Alms in 1997, for each 1 weed row−1, lint yield was reduced 71 kg ha−1 (or 5.9%) and 112 kg ha−1 (or 8.7%), respectively. Lint yield vs. end-of-season weed volume fit a linear model except at Alms in 1997. For each increase of 1 m3 of weed plot−1, cotton lint yield in 1996 was reduced by 1.6 and 1.5% at Perkins and Chickasha, respectively. In 1997 at Perkins and Altus (⩽ 6 weeds), each increase of 1 m3 of weed plot−1 reduced lint yield 1.6 and 2.3%, respectively. Lint yield vs. end-of-season weed biomass fit a linear model in all four experiments. Lint yield was reduced 5.2 to 9.3% for each increase of 1 kg of weed biomass plot−1. Fiber analyses revealed significant differences for micronaire (fiber fineness) among weed densities in two experiments, marginal significance in a third, and none in a fourth. An intermediate number of weeds often resulted in improved fiber micronaires in these environments. No other fiber properties were influenced by weed density.

Keywords

Palmer amaranth, Amaranthus palmeri S. Wats. AMAPAcotton, Gossypium hirsutum L. ‘Paymaster HS-26.’Competitionfiber propertieslint yieldweed biomassweed densityweed volume
Type
Weed Biology and Ecology
Information
Weed Science , Volume 47 , Issue 3 , June 1999 , pp. 305 - 309
Copyright
Copyright © 1999 by the Weed Science Society of America 

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Footnotes

Current address: Texas A&M Research and Extension Center, 6500 Amarillo Blvd. West, Amarillo, TX 79106

References

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