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Rice (Oryza sativa) Cultivar Tolerance to Clomazone in Water-Seeded Production

Published online by Cambridge University Press:  20 January 2017

Christopher R. Mudge
Affiliation:
Department of Agronomy and Environmental Management, 104 M. B. Sturgis Hall, Louisiana State University AgCenter, Baton Rouge, LA 70803
Eric P. Webster*
Affiliation:
Department of Agronomy and Environmental Management, 104 M. B. Sturgis Hall, Louisiana State University AgCenter, Baton Rouge, LA 70803
Chris T. Leon
Affiliation:
Department of Agronomy and Environmental Management, 104 M. B. Sturgis Hall, Louisiana State University AgCenter, Baton Rouge, LA 70803
Wei Zhang
Affiliation:
Department of Agronomy and Environmental Management, 104 M. B. Sturgis Hall, Louisiana State University AgCenter, Baton Rouge, LA 70803
*
Corresponding author's E-mail: [email protected]

Abstract

A field study was conducted in 2002 and 2003 to evaluate tolerance of eight rice cultivars to clomazone at 896 g ai/ha impregnated onto urea fertilizer. Rice foliar bleaching was 16 to 20% at 14 d after rice rooting (DAR) for long-grain cultivars ‘Ahrent’, ‘Cheniere’, ‘Cocodrie’, ‘Cypress’, ‘Francis’, and ‘Wells’ and 23 and 30% for medium-grain ‘Bengal’ and short-grain ‘Pirogue’, respectively, when clomazone was impregnated onto urea. Clomazone reduced the number of tillers/ m2 21 DAR for all cultivars. Early season height reductions occurred for all cultivars; however, Pirogue was the only cultivar shorter than the nontreated at harvest. There were no yield reductions with regard to the medium and long-grain cultivars when compared with respective nontreated cultivars. However, yield of short-grain Pirogue treated with clomazone was 1,740 kg/ha less than the nontreated.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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Footnotes

1 Published with approval of the Director of the Agricultural Experiment Station, Louisiana State University AgCenter, Baton Rouge, LA 70803, under manuscript number 05-14-0001.
Current address: University of Florida, IFAS, 7922 NW 71st Street, Gainesville, FL 32653.

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