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Influence of Cotton (Gossypium hirsutum) Densities on Competitiveness of Pigweed (Amaranthus spp.) and Sicklepod (Cassia obtusifolia)

Published online by Cambridge University Press:  12 June 2017

J. E. Street ,
G. A. Buchanan ,
R. H. Crowley  and
J. A. McGuire
J. E. Street
Affiliation:
Dep. Agron. and Soils, Auburn Univ. Agric. Exp. Stn., Auburn, AL 36830
G. A. Buchanan
Affiliation:
Dep. Agron. and Soils, Auburn Univ. Agric. Exp. Stn., Auburn, AL 36830
R. H. Crowley
Affiliation:
Univ. of Arkansas located at Southeast Res. Ext. Center, Monticello, AR 71655
J. A. McGuire
Affiliation:
Res. Data Anal., Auburn Univ. Agric. Exp. Stn., Auburn, AL 36830
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Abstract

Experiments were conducted from 1973 through 1975 on Lucedale sandy loam to determine the influence of in-row cotton (Gossypium hirsutum L. ‘Stoneville 213’) densities on the competitiveness of low-level infestations of sicklepod (Cassia obtusifolia L.) and pigweed (Amaranthus spp.). Weeds were established at densities of 0, 4, 12, and 32 weeds per 15 m of row and allowed to compete the entire season with cotton grown at densities of 5, 10, or 20 plants/m of row corresponding to 47000, 94000 and 187000 cotton plants/ha. Conventional cultural practices were employed in these experiments. Cotton yields were inversely related to weed density; however, the density of cotton did not influence the competitive effect of sicklepod or pigweed. Pigweed or sicklepod dry weed weight was reduced when competing with 187000 cotton plants/ha.

Keywords

Weed biologyweed ecologyplant interferencecotton yield
Type
Research Article
Information
Weed Science , Volume 29 , Issue 3 , May 1981 , pp. 253 - 256
Copyright
Copyright © Weed Science Society of America 

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References

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