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Red Rice (Oryza sativa) Control in Drill-Seeded 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
Roy J. Smith Jr.
Affiliation:
Dep. Agron., Univ. Arkansas, Fayetteville, AR 72701
Ronald E. Talbert
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Stuttgart, AR 72160
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Abstract

Field experiments were conducted to investigate methods of controlling red rice (Oryza sativa L. ♯ ORYSA) in drill-seeded rice (O. sativa). Treatments included the rice cultivar ‘Mars', coated with calcium peroxide (CaO2) at 40% (w/w) and a crop protectant, R-33865 (O,O-diethyl-O-phenyl phosphorothioate) at 0.5 and 1% (v/w). Molinate (S-ethyl hexahydro-1H-azepine-1-carbothioate) at 6.7 kg ai/ha was applied preplant incorporated (ppi). The land was flooded (2.5 to 5 cm deep) after seeding with rice (100 kg/ha, 2.5 cm deep), and the water was maintained throughout the growing season. CaO2, with or without molinate, increased rice grain yield 50% and increased rice culm density fivefold above untreated rice. Molinate applied ppi controlled 96% of the red rice. Rice seed coated with only CaO2 or with CaO2 plus R-33865 at 0.5%, each combined with ppi molinate, produced 5690 and 6030 kg/ha of grain, respectively. These high yields were associated with red rice control by molinate and good stands of rice provided by O2 supplied by CaO2. R-33865 applied to rice seed at 1% (v/w) injured rice by reducing rice culm densities 41%, compared with rice without protectant.

Keywords

Calcium peroxidemolinatewater managementweed controlORYSA
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 33 , Issue 5 , September 1985 , pp. 703 - 707
Copyright
Copyright © 1985 by the Weed Science Society of America 

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