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Competition between Barnyardgrass (Echinochloa crus-galli) and Redroot Pigweed (Amaranthus retroflexus)

Published online by Cambridge University Press:  12 June 2017

Gamini D. Siriwardana  and
Robert L. Zimdahl
Gamini D. Siriwardana
Affiliation:
Dep. of Bot. and Plant Pathol., Colorado State Univ., Ft. Collins, CO 80523
Robert L. Zimdahl
Affiliation:
Dep. of Bot. and Plant Pathol., Colorado State Univ., Ft. Collins, CO 80523
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Abstract

Growth and competition of barnyardgrass [Echinochloa crus-galli (L.) Beauv. ♯ ECHCG] and redroot pigweed (Amaranthus retroflexus L. ♯ AMARE) were studied at different seed proportions, seed burial depths, and soil moisture levels. After 7 days, emergence from 1-, 2-, 4-, and 8-cm depths was 96, 90, 83, and 27% for barnyardgrass and 84, 73, 62, and 0% for redroot pigweed, respectively. Barnyardgrass was more competitive than redroot pigweed. Intraspecific competition of barnyardgrass was greater than interspecific competition from redroot pigweed. Increasing planting depth from 1 to 4 cm and increasing soil moisture from 30 to 50% (low) to 100% (high) of field capacity reduced the competitive ability of redroot pigweed.

Keywords

Seed burialcompetitionsoil moistureECHCGAMARE
Type
Weed Biology and Ecology
Information
Weed Science , Volume 32 , Issue 2 , March 1984 , pp. 218 - 222
Copyright
Copyright © 1984 by the Weed Science Society of America 

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References

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