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Effect of Cultural Practices on Weed Control and Crop Response in Imidazolinone-Tolerant Rice

Published online by Cambridge University Press:  20 January 2017

Ronald J. Levy JR. ,
Jason A. Bond ,
Eric P. Webster ,
James L. Griffin  and
Steven D. Linscombe
Ronald J. Levy JR.
Affiliation:
LSU AgCenter, Cooperative Extension Service, 157 Cherokee Drive, Crowley, LA 70526
Jason A. Bond*
Affiliation:
LSU AgCenter, Rice Research Station, 1373 Caffey Road, Rayne, LA 70578
Eric P. Webster
Affiliation:
LSU AgCenter, Department of Agronomy and Environmental Management, LSU AgCenter, 104 Sturgis Hall, Baton Rouge, LA 70803
James L. Griffin
Affiliation:
LSU AgCenter, Department of Agronomy and Environmental Management, LSU AgCenter, 104 Sturgis Hall, Baton Rouge, LA 70803
Steven D. Linscombe
Affiliation:
LSU AgCenter, Rice Research Station, 1373 Caffey Road, Rayne, LA 70578
*
Corresponding author's E-mail: [email protected]
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Abstract

Field research was conducted for 3 yr to evaluate crop response and weed control under conventional and reduced tillage in drill- and water-seeded imidazolinone-tolerant (IT) rice culture. Imazethapyr was applied at 70 g ai/ha PRE followed by (fb) imazethapyr at 70 g/ha applied POST to three- to four-leaf rice or at 105 g/ha PRE fb 70 g/ha POST. In both conventional and reduced tillage systems, imazethapyr applied PRE fb POST at 70 g ai/ha controlled red rice, barnyardgrass, Amazon sprangletop, and rice flatsedge 87 to 99% 35 d after POST treatment (DAT). At 35 DAT, Indian jointvetch control with sequential applications of imazethapyr was as high as 70% in water-seeded rice but no more than 54% in drill-seeded rice. Tillage, seeding method, and imazethapyr rate had no effect on days to 50% heading, seeds per panicle, seed weight per panicle, or percentage of seed harvest. However, a reduction of 27% in days to 50% heading, 80% in seeds per panicle, 84% in seed weight per panicle, and 100% in percentage seed harvest index occurred when imazethapyr was not applied because of weed interference. Culm number was reduced 28%, and culm weight 32% under reduced tillage compared with conventional tillage. With sequential applications of imazethapyr at 70 g/ha, rice yield was 63% greater when rice was water-seeded compared with drill-seeded. No differences in tillage systems for weed control, days to 50% heading, seed number, seed weight per panicle, percent seed, panicle height, lodging, or yield were observed. Results of these experiments demonstrate imazethapyr will effectively control weeds in both water- and drill-seeded rice and that reduced tillage can be used without negatively affecting rice production.

Keywords

ImazethapyrAmazon sprangletop, Leptochloa panicoides (Presl) Hitchc. #3 LEFPAbarnyardgrass, Echinochloa crus-galli (L.) Beauv. # ECHCGIndian jointvetch, Aeschynomene indica L. # AESINred rice, Oryza sativa L. # ORYSArice flatsedge, Cyperus iria L. # CYPIRrice, Oryza sativa L. ‘93-AS-3510’, ‘CL121’Conventional tillagecrop injurydrill-seeded ricereduced tillagewater-seeded riceALSacetolactate synthase (E.C.4.1.3.18)
Type
Research Article
Information
Weed Technology , Volume 20 , Issue 1 , March 2006 , pp. 249 - 254
Copyright
Copyright © Weed Science Society of America 

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