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Rice (Oryza sativa) Response to the Microencapsulated Formulation of Clomazone1

Published online by Cambridge University Press:  20 January 2017

Patrick K. Bollich ,
David L. Jordan ,
Douglas M. Walker  and
Ann B. Burns
Patrick K. Bollich
Affiliation:
Rice Research Station, P.O. Box 1429, Crowley, LA 70527
David L. Jordan*
Affiliation:
Northeast Research Station, P.O. Box 438, St. Joseph, LA 71366
Douglas M. Walker
Affiliation:
Rice Research Station, Bastrop, LA 71220
Ann B. Burns
Affiliation:
Northeast Research Station, St. Joseph, LA 71366
*
Corresponding author's E-mail: [email protected].
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Abstract

Experiments were conducted in 1996 and 1997 in water-seeded and drill-seeded production systems to determine rice response to clomazone applied at rates ranging from 0.28 to 2.2 kg ai/ha on silt loam and silty clay soils. Clomazone-induced bleaching of rice seedlings was 15% or less when clomazone was applied at 0.28 or 0.56 kg/ha. Increasing the rate of clomazone increased bleaching in most experiments. Clomazone at 0.84 kg/ha or higher delayed seed head emergence in five of eight experiments. Clomazone at lower rates did not delay seed head emergence. Although clomazone at 0.28 and 0.56 kg/ha did not reduce grain yield, clomazone at 0.84 and 1.1 kg/ha reduced grain yield in one experiment while clomazone at 1.7 and 2.2 kg/ha reduced yield in two experiments. The influence of soil type and seeding method on rice's tolerance to the microencapsulated formulation of clomazone could not be demonstrated in these experiments. Clomazone was more injurious in drill-seeded production than in water-seeded production.

Keywords

Clomazone, 2-[(2-chlorophenyl)methyl]-4,4-dimethyl-3-isoxazolidinonerice, Oryza sativa L. ‘Cypress’Crop injuryPRE, preemergence
Type
Research
Information
Weed Technology , Volume 14 , Issue 1 , March 2000 , pp. 89 - 93
Copyright
Copyright © Weed Science Society of America 

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Footnotes

1 Published with permission of the Vice Chancellor and Director of Research, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge, LA 70894.
Current address: Crop Science Department, North Carolina State University, Box 7620, Raleigh, NC 27695-7620.

References

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