AbstractThree herbicide trials on rice (Oryza sativa L.) were conducted on Coloso clay (Entisols) and on Toa clay loam (Mollisols) from 1981 to 1983 with bentazon [3(1-methyl)-(1 H)-2, 1,3-benzothiadiazin-4-(3H)-one 2,2- dioxide] mixed with propanil [N-(3,4-dichlorophenyl) propanamide] or with bifenox [methyl 5-(2,4-dichlorophenoxy) 2-nitrobenzoate] for early postemergence weed control. Good to excellent weed control was obtained by the above-mentioned bentazon mixtures. These mixtures were particularly effective against rice flatsedge (Cyperus iria L.), a weed not previously controlled by other herbicides. Marginal herbicide phytotoxicity to rice plants was noted in one trial when bentazon at a higher rate was mixed with propanil. All bentazon mixtures resulted in higher yields than standard treatment of propanil alone or thiobencarb [S-(4-dichlorophenyl methyl diethylcarbamothioate] alone by a margin of 8.7 to 26.9%.
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