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Weed Interference with Cotton (Gossypium Birsutum). II. Tumble Pigweed (Amaranthus Albus)

Published online by Cambridge University Press:  12 June 2017

Doug W. Rushing ,
Don S. Murray  and
Laval M. Verhalen
Doug W. Rushing
Affiliation:
Dep. Agron., Oklahoma State Univ., Stillwater, OK 74078
Don S. Murray
Affiliation:
Dep. Agron., Oklahoma State Univ., Stillwater, OK 74078
Laval M. Verhalen
Affiliation:
Dep. Agron., Oklahoma State Univ., Stillwater, OK 74078
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Abstract

Relationships between production of cotton (Gossypium birsutum L. ‘Westburn M’) and full-season interference from tumble pigweed (Amaranthus albus L. ♯ AMAAL) at densities ranging from 0 to 64 plants/10 m of row were measured in three replicated experiments in the field. Dry weight of harvested tumble pigweed increased by 0.149 to 0.402 kg/plot for each additional weed/10 m of row. Intraspecific competition among tumble pigweed plants was observed at the higher weed densities. Cotton plant height was reduced in all three experiments at the 32 or 64 weed densities, but harvesting difficulties were not encountered in these studies. The threshold density where initial lint yield reductions occurred ranged from 4 to 16 tumble pigweed plants/10 m of row in the three experiments. Lint yields were reduced from 8 to 11 kg/ha for each additional tumble pigweed plant/10 m of row. Interference from tumble pigweed did not significantly affect cotton fiber length, uniformity, strength, or micronaire of hand-harvested bolls.

Keywords

Competitionfiber qualitylint yieldcrop heightAMAAL
Type
Weed Biology and Ecology
Information
Weed Science , Volume 33 , Issue 6 , November 1985 , pp. 815 - 818
Copyright
Copyright © 1985 by the Weed Science Society of America 

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References

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