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Shading Responses of Purple and Yellow Nutsedges (Cyperus rotundus and C. esculentus)

Published online by Cambridge University Press:  12 June 2017

David T. Patterson
David T. Patterson*
Affiliation:
South’. Weed Sci. Lab., U.S. Dep. Agric, Agric. Res. Serv., Stoneville, MS 38776
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Abstract

The effects of shade on dry-matter production, leaf area, and biomass partitioning in purple nutsedge (Cyperus rotundus L.) and yellow nutsedge (C. esculentus L.) were determined in a controlled-environment greenhouse with a day/night temperature regime of 32/26 C. For comparison with a full-light treatment, screening provided 40, 70, and 85% shade. Shading significantly reduced height of yellow nutsedge and dry-matter production, leaf-area production, and rhizome and tuber formation of both species. Shading decreased the partitioning of plant biomass into tubers and rhizomes and increased partitioning into leaves. Yellow nutsedge had a higher net-assimilation rate than purple nutsedge at all levels of shading, but the greater leaf-area duration or total amount of leaf area present in purple nutsedge resulted in greater dry-matter production by that species. The responses of the two species showed no differences in shade tolerance.

Keywords

Growth analysisshade tolerancebiomass partitioning
Type
Research Article
Information
Weed Science , Volume 30 , Issue 1 , January 1982 , pp. 25 - 30
Copyright
Copyright © 1982 by the Weed Science Society of America 

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