Evaluation of herbicides for weed control in dry-seeded wetland rice (Oryza sativa)
1988
Estoninos, L.E. | Moody, K.
When herbicides were evaluated for weed control in dry-seeded wetland rice (Oryza sativa L.) in 1982 and 1983, variability in their performance was observed between years. In 1982, in a preliminary screening trial, the most promising herbicides for the control of a weed flora dominated by Melochia concatenata L. were propanil N-(3,4- dichlorophenyl) propanamide-thiobencarb (S-[(4-chlorophenyl) methyl] diethyl carbamothioate) and propanil-thiobencarb-fenoprop (plus or minus)-2-(2,4,5-trichlorophenoxy) propionic acid. In an advanced screening trial where Echinochloa colona (L.) Link was the major weed, pendimethalin [N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitro-benzenamine] + propanil thiobencarb, acifluorfen-ethyl [ethyl-5(2-chloro-4-trifluoromethyl-phenoxy)-2-nitrobenzoate] and thiobencarb + propanil gave adequate weed control and significantly higher rice yields than the untreated check. When some of these herbicides were tested in 1983, propanil-thiobencarb and pendimethalin + propanil failed to control the major weeds (E. colona and Digitaria spp.) effectively and yields were not significantly different from those of the untreated check. Yields were highest when a sequential application of butachlor [N-(bhuthoxymethy)2-chloro N-(2,6-diethylphenyl) acetamide] and propanil was applied. Hand weeding of all plots 40 days after emergence (DAE) increased yield significantly in all treatments. Variations in the performance of the herbicides were attributed to differences in the dominant weed species and soil conditions at the time of herbicide application.
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