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Interference of Red Rice (Oryza sativa) with Rice (O. sativa)

Published online by Cambridge University Press:  12 June 2017

Amadou Diarra ,
Roy J. Smith Jr.  and
Ronald E. Talbert
Amadou Diarra
Affiliation:
Dep. Agron., Univ. Arkansas, Fayetteville, AR 72701 Agric. Res. Serv., U.S. Dep. Agric., Stuttgart, AR 72160
Roy J. Smith Jr.
Affiliation:
Dep. Agron., Univ. Arkansas, Fayetteville, AR 72701 Agric. Res. Serv., U.S. Dep. Agric., Stuttgart, AR 72160
Ronald E. Talbert
Affiliation:
Dep. Agron., Univ. Arkansas, Fayetteville, AR 72701 Agric. Res. Serv., U.S. Dep. Agric., Stuttgart, AR 72160
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Abstract

Red rice (Oryza sativa L. ♯ ORYSA) densities of 5, 108, and 215 plants/m2 reduced grain yield of commercial rice (Oryza sativa L.) 22, 77, and 82%, respectively. At a cultivated rice density of 195 plants/m2, red rice at 5, 108, and 215 plants/m2 reduced straw dry weight of cultivated rice 18, 66, and 68%, respectively. At a red rice density of 5 plants/m2, reduction in number of cultivated rice grains per panicle ranged from 8 to 18%, whereas densities of 108 and 215 plants/m2 reduced grains per panicle 56 to 70%. Red rice grain yield was 24 to 33% lower in ‘Mars' rice than in ‘Lebonnet’. Mars, a medium-grain cultivar that matures in 138 days, competed better with red rice than Lebonnet, a long-grain cultivar that matures in 126 days.

Keywords

Rice densityweed competitionweed densityORYSA
Type
Weed Biology and Ecology
Information
Weed Science , Volume 33 , Issue 5 , September 1985 , pp. 644 - 649
Copyright
Copyright © 1985 by the Weed Science Society of America 

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