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Competitive Interactions of Wheat (Triticum aestivum) and Wild Oats (Avena fatua) Grown at Different Densities

Published online by Cambridge University Press:  12 June 2017

David W. Cudney ,
Lowell S. Jordan ,
Jodie S. Holt  and
John S. Reints
David W. Cudney
Affiliation:
Dep. Bot. and Plant Sciences, Univ. California, Riverside, CA 92521
Lowell S. Jordan
Affiliation:
Dep. Bot. and Plant Sciences, Univ. California, Riverside, CA 92521
Jodie S. Holt
Affiliation:
Dep. Bot. and Plant Sciences, Univ. California, Riverside, CA 92521
John S. Reints
Affiliation:
Dep. Bot. and Plant Sciences, Univ. California, Riverside, CA 92521
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Abstract

Competitive interactions of wheat and wild oats in relation to variations in plant density of both species were investigated in field studies under irrigation and added fertilizer. Competition studies included comparisons by both additive and replacement series. The additive series was used to study plant responses to competition under fixed density of wheat and increasing density of wild oats. The replacement series was used to study plant responses to competition under constant total plant density with differing proportions of wheat and wild oats. On a per plant basis, shoot dry weight and leaf area index of wild oats were less than those of wheat at anthesis. However, the replacement series experiment indicated that wheat and wild oats were equivalent in competitiveness. Relative density of wild oats gave a better regression fit for wheat yield than did absolute wild oats density (r2 values of 0.83 and 0.61, respectively). Yield of wheat grain was linearly proportional to relative density of wild oats.

Keywords

Wild oats, Avena fatua L. ♯3 AVEFAwheat, Triticum aestivum L. ‘Anza.’InterferencedensityAVEFA
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 37 , Issue 4 , July 1989 , pp. 538 - 543
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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