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Response of Rice and Barnyardgrass (Echinochloa crus-galli) to Rates and Timings of Clomazone

Published online by Cambridge University Press:  20 January 2017

Wei Zhang ,
Eric P. Webster  and
David C. Blouin
Wei Zhang
Affiliation:
Department of Agronomy, Louisiana State University AgCenter, 104 M. B. Sturgis, Baton Rouge, LA, 70803
Eric P. Webster*
Affiliation:
Department of Agronomy, Louisiana State University AgCenter, 104 M. B. Sturgis, Baton Rouge, LA, 70803
David C. Blouin
Affiliation:
Louisiana State University AgCenter, Department of Experimental Statistics, 161 Agricultural Administration Building, Baton Rouge, LA 70803
*
Corresponding author's E-mail: ewebster@agcenter.lsu.edu
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Abstract

The response of rice and barnyardgrass to clomazone rates (0.22, 0.45, 0.67, 0.9, and 1.12 kg ai/ha) and application timings of preplant incorporated, preemergence (PRE), and delayed PRE (DPRE) were evaluated from 1997 to 1999. Rice bleaching at 14 d after planting (DAP) increased from 5 to 35% as the clomazone rate increased. At 14 and 49 DAP, barnyardgrass control decreased with clomazone at 0.22 kg/ha compared with control at higher rates. Clomazone at 0.22 kg/ha resulted in lower grain yield. Clomazone PRE caused less rice bleaching and lower grain yield compared with DPRE timings. These results indicate that initial bleaching by high clomazone rates may not translate into yield loss. Higher clomazone rates may increase rice yield by improving weed control.

Keywords

Clomazonebarnyardgrass, Echinochloa crus-galli (L.) Beauv. # ECHCGrice, Oryza sativa L., ‘Lemont’, ‘Cypress’Application timingherbicide rate responseDAP, days after plantingDPRE, delayed preemergencePPI, preplant incorporatedPRE, preemergence
Type
Research
Information
Weed Technology , Volume 19 , Issue 3 , September 2005 , pp. 528 - 531
Copyright
Copyright © Weed Science Society of America 

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Footnotes

1 Published with the approval of the Director of the Agricultural Experiment Station, Louisiana State University AgCenter, Baton Rouge, LA 70803, under manuscript number 02-14-0711.

References

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