Ecology, Environment and Conservation Paper

Vol 25, May Suppl. Issue, 2019; Page No.(67-72)

WEED MANAGEMENT IN RICE AS INFLUENCED BY NITROGENAPPLICATION AND HERBICIDE USE

S. Krishnaprabu

Abstract

A field experiment was conducted for two consecutive seasons of 2017 and 2018 at Annamalai University,Annamalai Nagar, to evaluate the effect of nitrogen application and weed management on transplantedrice and associated weeds. Puddled transplanting recorded significantly reduced weed density and higher weed control efficiency at 60 days after transplanting (DAT) as compared to unpuddled transplanting.Butachlor 1.5 kg/ha followed by cono-weeding at 20 and 40 DAT recorded significantly higher plant height,no. of tillers/hill, dry matter accumulation, leaf area index, 1000-grain weight, no. of panicles/hill, grains/panicle and grain yield as compared to pretilachlor 0.75 kg/ha followed by azimsulfuron 35 g/ha at 15DAT, and butachlor 1.5 kg/ha followed by azimsulfuron 35 g /ha at 15 DAT. Significantly higher yieldcomponents and rice grain yield were recorded with the application of 1/4 at 10 DAT, 1/2 at tillering and1/4 N at panicle initiation as compared to conventional scheduling of nitrogen application.

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