Studies on Bio efficacy and Phytotoxicity of Pretilachlor 30.7% EC in Direct Seeded Rice

Abstract

The experiment was conducted during late kharif season of 2015 and 2016 at Central Research Farm, Gayeshpur, Nadia, West Bengal to study the effect of Pretilachlor 30.7% EC at different doses of application for weed management in direct seeded rice. Eight different weed control treatments viz. four different doses of Pretilachlor 30.7% EC (TP) applied at 300, 450, 600 and 1200 g a.i. ha-1, Pretilachlor 30.7% EC (SC) at 600 g a.i. ha-1, Oxyflourfen 23.5% EC at 240 g a.i. ha-1, hand weeding twice at 20 and 40 DAS and unweeded control. The experiment was laid out in a randomized block design (RBD) replicated thrice. From the results, it was revealed that so far as population of weeds, weed dry weight, weed control efficiency, yield parameters and rice yield concerned, the treatment Pretilachlor 30.7 % EC 1200 g a.i. ha-1 came out as the best one being statistically at par with rest of the treatment but Pretilachlor 30.7 % EC 600 g a.i. ha-1 was found cost effective among all the treatments so it can be recommended for sufficient management of weeds as well as significant increase in grain yield. There was no phytotoxicity effect on rice, physico-chemical properties of soil also no significant differences observed in any of the doses of the testing herbicide in direct seeded rice crop.