Efficacy of doses of fenoxaprop-p-ethyl 69 ec and cyhalofop-butyl 10 ec on weed growth, yield and economics in transplanted rice (Oryza sativa)

摘要

A field investigation was conducted during the rainy season of 2019 at Agricultural Research Farm, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, to study the efficacy of doses of fenoxaprop-p-ethyl 69% ec and cyhalofop-butyl 10% ec in transplanted rice (Oryza sativa L.). Among different her-bicidal treatments fenoxaprop-p-ethyl 86.25 g/ha recorded lower weed density of awnless barnyard grass [Echinochloa colona (L.) Link], water grass [Echinocloa crus-galli (L.) Beauv.] and other weeds, total dry weight and higher weed-control efficiency at 58 days after transplanting, followed by cyhalofop-butyl 80.0 g/ha. Phytotoxicity on crop plants caused by the application of fenoxaprop-p ethyl 86.5 g/ha included yellowing, necrosis, stunting, and epinasty at various stages; however, phytotoxicity disappeared as the crop developed. Fenoxaprop-p-ethyl 86.25 g/ha markedly improved growth attributes, viz. plant height, tillers/hill, dry-matter accumulation/hill, leaf-areaindex, chlorophyll content and yield attributes and yield, viz. panicle length, panicle weight, panicles/hill, grains/panicle, 1,000-grain weight, grain and straw yields and net returns in comparison to cyhalofop-butyl 80.0 g/ ha and lower dose of fenoxaprop-p-ethyl 69.0 g/ha.