EFFICACY OF DIFFERENT PRE AND POST-EMERGENCE HERBICIDES TO CONTROL WEEDS IN DIRECT SEEDED RICE

Abstract

Weed infestation is a major problem in direct seeded rice because weeds reduce yield as well as quality of rice. Manual weeding in direct seeded rice is very tedious, time consuming and mostly weather dependent operation. A field experiment was conducted in summer season 2018 to study the comparative efficacy of different pre and post-emergence herbicides in direct seeded rice to control weeds. The experiment was comprised of ten treatments with eight herbicides application viz. pendimethalin at 1137.5 g a.i. ha^-1, oxadiargyl 80 g a.i. ha^-1, triafaman+ ethoxy sulfuran ethyl 56.25 g a.i. ha^-1, pyriftalid+ bensulfuron ethyl 220.32 ml a.i. ha^-1, bispyribac sodium+bensulfuran 75 g a.i. ha^-1, phenoxaprop 431.25 ml a.i. ha^-1, pendimethalin 1137.5 g FB ethoxy sulfuran ethyl 7.5 g a.i. ha^-1, oxadiargyl 80 g a.i. ha^-1 FB ethoxy sulfuran ethyl 7.5 g a.i. ha^-1 and there were two control treatments viz. hand weeding and weedy check. The experiment was laid out in randomized complete block design (RCBD) with three replications. The data related to weed growth, weed dominance analyses and yield parameters were recorded and calculated by following the standard procedures. The results showed that triafaman+ ethoxy sulfuran ethyl gave effective weed control for about 50 days after sowing as compared to other herbicides. Also all the yield related parameters rice were recorded maximum in hand weeding and triafaman+ ethoxy sulfuran ethyl applied treatment. As hand weeding is a very tough operation, application of triafaman+ ethoxy sulfuran ethyl 56.25 g a.i ha^-1 as pre-emergence herbicide is recommended to get effective control of weeds and higher paddy yield in direct seeded rice.