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

Rowland, Matt W. ; Murray, Don S. ; Verhalen, Laval M.

Weed science, 1999-06, Vol.47 (3), p.305-309 [Periódico revisado por pares]

Cambridge, UK: Cambridge University Press

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  • Título:
    Full-season Palmer amaranth (Amaranthus palmeri) interference with cotton (Gossypium hirsutum)
  • Autor: Rowland, Matt W. ; Murray, Don S. ; Verhalen, Laval M.
  • Assuntos: Amaranth ; Biomass ; Cotton ; Crop harvesting ; Density ; Herbicides ; Linear models ; Plants ; Tillage ; Weed Biology and Ecology ; Weeds
  • É parte de: Weed science, 1999-06, Vol.47 (3), p.305-309
  • Descrição: 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.
  • Editor: Cambridge, UK: Cambridge University Press
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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