Efficacy of new generation herbicides on weeds in direct seeded rice (Oryza sativa L.)

A field study was conducted during Kuruvai season of 2020 to evaluate the efficacy of new generation herbicides at Pattathikadu village, Karambakudi Taluk, Pudukkottai district, Tamil Nadu. Eleven treatments were evaluated in RBD design and replicated thrice. Early post emergence application of bispyribac sodium 10 % SC @ 200 ml ha-1 on 15 DAS fb hand weeding on 40 DAS suppressed both weed population (20.16 m-2)andweed dry matter production (33.59 kg ha-1) and recorded highest weed control index (90.70 %) at 60 DAS over unweeded check. Growth and yield attributes of ricewere significantly improved with early post emergence application of bispyribac sodium 10 % SC @ 200 ml ha-1 on 15 DAS fb hand weeding on 40 DAS. Growth attributes viz., plant height (48.80, 78.56 cm at 30, 60 DAS and 94.54 cm at harvest respectively), leaf area index at flowering stage (6.89), number of panicle m-2 (434.14), number of tillers hill-1 (26.21), dry matter production (6,946, 11,917 and 13,646 kg ha-1 at 30, 60 DAS and harvest respectively) and yield attributes viz., number of filled grain panicle-1 (94.14)and grain (6540 kg ha-1) and straw (8522 kg ha-1) yieldswere recorded under early post emergence application of bispyribac sodium 10 % SC @ 200 ml ha-1 on 15 DAS fb hand weeding on 40 DAS hence appeared to be a viable strategy for weed control in direct seeded rice.