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Competitive Impact of Palmer Amaranth (Amaranthus palmeri) on Cotton (Gossypium hirsutum) Development and Yield

Published online by Cambridge University Press:  20 January 2017

Gaylon D. Morgan ,
Paul A. Baumann  and
James M. Chandler
Gaylon D. Morgan*
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77840
Paul A. Baumann
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77840
James M. Chandler
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77840
*
Corresponding author's E-mail: [email protected].
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Abstract

A full-season field study was conducted near College Station, TX to determine the competitive interference of Palmer amaranth on cotton development, yield, and fiber properties and to measure Palmer amaranth development as influenced by intraspecific competition. Palmer amaranth densities ranged from 0 to 10 plants/9.1 m of row. Palmer amaranth decreased cotton canopy volume by 45% at 10 wk after cotton emergence (WAE) and cotton biomass by greater than 50% at 8 WAE at the highest density. Cotton yields decreased linearly from 13 to 54% for 1 to 10 Palmer amaranth plants/9.1 m of row. Cotton lint properties were not influenced by Palmer amaranth density. Palmer amaranth volume and individual biomass were not affected by intraspecific competition at any of the densities.

Keywords

Cotton, Gossypium hirsutum L. Delta and Pineland 50Palmer amaranth, Amaranthus palmeri S. Wats # AMAPACotton biomassinterspecific competitionintraspecific competitionweed densityPOST, postemergenceWAE, weeks after emergence
Type
Research
Information
Weed Technology , Volume 15 , Issue 3 , September 2001 , pp. 408 - 412
Copyright
Copyright © Weed Science Society of America 

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