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Propanil plus methyl parathion on rice (Oryza sativa)

Propanil plus methyl parathion on rice (Oryza sativa)

Weed Science 36(3): 335-339

Effects of propanil [N-(3,4-dichlorophenyl)propanamide] applied to three- to four-leaf rice (Oryza sativa L.) 1 or 7 days before, after, or tank mixed with methyl parathion (O,O-dimethyl-O-4-nitrophenyl phosphorothioate) were determined under different environmental conditions. Field experiments determined the effect on yield of drill-seeded rice, 'Labelle' for two planting dates in 1982 and 'Lemont' for one planting date in 1986. Treatments were applied at sunrise and at noon. Growth chamber and greenhouse experiments determined the effects of temperature, relative humidity (RH), and soil moisture on response of Labelle rice. In all experiments, propanil, both alone and with methyl parathion, resulted in 20 to 30% leafburn during the first week after treatment with rapid recovery to less than 10% injury after 3 to 4 weeks. In field experiments, yields were not reduced in the treated rice below that in the untreated controls. In controlled-environment experiments, rice was not injured by propanil plus methyl parathion more than by propanil alone after 2 to 4 weeks. Both treated and untreated rice were injured more by the environmental conditions of high (40C) temperature, low (40%) RH, and low (near the wilting point) soil moisture than by low (30C) temperature, high (100%) RH, and flooded soil.

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Accession: 001664784

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DOI: 10.2307/4044645

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