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Growth Responses of Green and Yellow Foxtail (Setaria viridis and S. lutescens) to Shade

Published online by Cambridge University Press:  12 June 2017

Carol J. Bubar  and
Ian N. Morrison
Carol J. Bubar
Affiliation:
Agric. Canada, Res. Stn., Regina, Saskatchewan S4P 3A2
Ian N. Morrison
Affiliation:
Dep. Plant Sci., Univ. of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
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Abstract

The growth of green foxtail (Setaria viridis L. Beauv. ♯3 SETVI) and yellow foxtail [S. lutescens (Weigel.) Hubb. ♯ SETLU] in full sunlight, under 55 and 73% shade and within a wheat (Triticum aestivum L. ‘Neepawa’) stand, was compared in field experiments conducted over 3 yr. Shade resulted in a proportionately greater reduction in tiller number of yellow foxtail than of green foxtail. Plants growing in full sunlight produced up to five times more tillers than those growing in the crop. Averaged over the 3 yr, the two shade treatments reduced dry-matter accumulation of both species by 40% or more. The dry weight of plants within the crop was only about one-eighth of that of plants grown in full sunlight. Under both shade treatments and in the crop, yellow foxtail was consistently taller than green foxtail. Nevertheless, no differences in dry weight occurred between species under either shade treatment or in the crop. The results indicate that neither of the two species is distinctly more shade tolerant than the other, nor better adapted to compete with wheat.

Keywords

Triticum aestivumreduced irradianceSETVISETLU
Type
Weed Biology and Ecology
Information
Weed Science , Volume 32 , Issue 6 , November 1984 , pp. 774 - 780
Copyright
Copyright © 1984 by the Weed Science Society of America 

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References

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