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The competitive ability of wheat (Triticum aestivum) compared to rigid ryegrass (Lolium rigidum) and cowcockle (Vaccaria hispanica)

Published online by Cambridge University Press:  12 June 2017

Abbes Tanji ,
Robert L. Zimdahl  and
Philip Westra
Robert L. Zimdahl
Affiliation:
Weed Research Laboratory, Department of Bioagricultural Sciences and Pest Management, Colorado State University, Ft. Collins, CO 80523
Philip Westra
Affiliation:
Weed Research Laboratory, Department of Bioagricultural Sciences and Pest Management, Colorado State University, Ft. Collins, CO 80523
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Abstract

Greenhouse and field experiments were conducted to study competition between wheat and rigid ryegrass or between wheat and cowcockle using additive series and growth analysis. Wheat was the dominant competitor with either weed. One wheat plant was as competitive as 1 1 or 19 rigid ryegrass plants in greenhouse and field experiments, respectively. One wheat plant was as competitive as three to 24 cowcockle plants, depending on environmental conditions. Dry weight of roots, leaves, stems, and spikes or capsules responded similarly to the effects of competition between wheat and rigid ryegrass or cowcockle. Shoot dry weight was the easiest, fastest, and least expensive component to measure competition. Growth analyses of individual plants showed that wheat had a greater leaf area, shoot and root dry weight, and absolute growth rate than rigid ryegrass or cowcockle, particularly early in the season. A range of 120 to 240 wheat plants m−2 can minimize rigid ryegrass or cowcockle competition and achieve an acceptable grain yield in semiarid areas in Morocco.

Keywords

Cowcockle, Vaccaria hispanica (Mill.) Rausch. VAAPYrigid ryegrass, Lolium rigidum G. LOLRIwheat, Triticum aestivum L. ‘Nesma.’Wheat densitycompetitionMoroccoLOLRIVAAPY
Type
Weed Biology and Ecology
Information
Weed Science , Volume 45 , Issue 4 , August 1997 , pp. 481 - 487
Copyright
Copyright © 1997 by the Weed Science Society of America 

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Footnotes

Corresponding address: Institut National de la Recherche Agronomique, BP 589, Settat, Morocco.

References

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