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Rice (Oryza sativa) Cultivar Tolerance to Clomazone

Published online by Cambridge University Press:  20 January 2017

Eric F. Scherder ,
Ronald E. Talbert  and
Shawn D. Clark
Eric F. Scherder*
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR 72701
Ronald E. Talbert
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR 72701
Shawn D. Clark
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR 72701
*
Corresponding author's E-mail: [email protected]
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Abstract

Field experiments were conducted in 1999 and 2000 at the Rice Research and Extension Center at Stuttgart, AR, on a DeWitt silt loam and at the Pine Tree Branch Experiment Station near Colt, AR, on a Calloway silt loam to evaluate the tolerance of 14 rice cultivars and four experimental cultivar lines to clomazone at 0.34 and 0.67 kg ai/ha applied preemergence. Early-season chlorosis 14 days after emergence (DAE) ranged from 1 to 21% in 1999 and 3 to 40% in 2000 when averaged over herbicide rate. The experimental cultivar line RU961096 was slightly more susceptible to clomazone than other cultivars and lines. However, RU9701041 was more tolerant to clomazone at 0.67 kg/ha 14 DAE than other cultivars and lines. By 28 DAE, all cultivars had <13% chlorosis in 1999 and <8% in 2000. The experimental cultivar line RU9601096 and cultivar Koshihikari did not recover as quickly as the other 16 cultivars and cultivar lines. Early-season chlorosis had no effect on days to 50% heading or yield for any of the cultivars evaluated.

Keywords

Clomazonerice, Oryza sativa L. ‘Ahrent’, ‘Bengal’, ‘Cocodrie’, ‘Cypress’, ‘Drew’, ‘Jefferson’, ‘Kaybonnet’, ‘Koshihikari’, ‘Lemont’, ‘LaGrue’, ‘Madison’, ‘Mars’, ‘Priscilla’, ‘RU9601096’, ‘RU9701041’, ‘RU9801081’, ‘RU9801148’, and ‘Wells’Rice cultivar tolerancerice injuryDAE, days after emergencePPI, preplant incorporatedPRE, preemergence
Type
Research
Information
Weed Technology , Volume 18 , Issue 1 , March 2004 , pp. 140 - 144
Copyright
Copyright © Weed Science Society of America 

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