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Competition of Bearded Sprangletop (Leptochloa fascicularis) with Rice (Oryza sativa)

Published online by Cambridge University Press:  12 June 2017

Roy J. Smith Jr.
Roy J. Smith Jr.*
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Stuttgart, AR 72160
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Abstract

Yields of drill-seeded paddy rice (Oryza sativa L. ‘Lebonnet’) at optimum stands of 215 to 270 plants/m2 at Stuttgart, Arkansas, were reduced 9, 18, 20, and 36% by bearded sprangletop [Leptochloa fascicularis (Lam.) Gray] densities of 11, 22, 54, and 108 plants/m2, respectively. There was a linear decrease in rice grain yield of 21 kg/ha for each bearded sprangletop plant per square meter. Weed densities of 54 and 108 plants/m2 reduced head-rice yields (whole milled kernels) and a density of 108 plants/m2 reduced germination of rice seed. The number of bearded sprangletop panicles produced per weed plant decreased as the weed density increased.

Keywords

Weed biologyweed controlweed interference
Type
Research Article
Information
Weed Science , Volume 31 , Issue 1 , January 1983 , pp. 120 - 123
Copyright
Copyright © 1983 Weed Science Society of America 

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