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Early Postemergence Clomazone Tank Mixes on Coarse-Textured Soils in Rice

Published online by Cambridge University Press:  20 January 2017

S.D. Willingham ,
N.R. Falkenberg ,
G.N. McCauley  and
J.M. Chandler
S.D. Willingham*
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, 370 Olsen Blvd, College Station, TX 77843
N.R. Falkenberg
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, 370 Olsen Blvd, College Station, TX 77843
G.N. McCauley
Affiliation:
Texas A&M Agricultural Experiment Station, Eagle Lake, TX 77434
J.M. Chandler
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, 370 Olsen Blvd, College Station, TX 77843
*
Corresponding author's E-mail: [email protected].
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Abstract

Clomazone was labeled for rice in 2001; however, that label excluded its use on coarse- (light) textured soils, including sand, loamy sand, and sandy loam with less than 1% organic matter due to rice injury. Field studies conducted in 2005, 2006, and 2007 evaluated weed control and tolerance of rice to early postemergence (EPOST) applications of clomazone alone and tank mixed with other herbicides on sandy loam and clay loam soils. At 42 d after treatment (DAT), broadleaf signalgrass (BRAPP) and barnyardgrass (ECHCG) control was > 86%. At 14 DAT, rice injury was greatest (13%) from clomazone applied preemergence (PRE) at 0.44 kg ai/ha on sandy soil. Annual sedge (CYPCP) control was > 78% on sandy loam soils at 14 DAT, but increased to > 90% by 42 DAT. On clay loam soils, CYPCP control at 42 DAT ranged from 60 to 76% from clomazone alone or tank mixed with cyhalofop or fenoxaprop. All other tank mixes provided > 80% control. Hemp sesbania (SEBEX) control was > 80% from all tank mixes. Clomazone alone provided < 77% control. Data suggest that clomazone can be used EPOST in combination with other herbicides without causing significant rice injury on sandy loam soils in Texas.

Keywords

Clomazonebroadleaf signalgrass, Urochloa platyphylla (Griseb.) Nashbarnyardgrass, Echinochloa crus-galli L.annual sedge, Cyperus compressus Lhemp sesbania, Sesbania herbacea (P. Mill) McVaughrice, Oryza sativa L.Crop injuryherbicide combinationsweed management
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 22 , Issue 4 , December 2008 , pp. 565 - 570
Copyright
Copyright © Weed Science Society of America 

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