Effect of Chemical and Non-Chemical Weed Management Practices in Direct Seeded Rice

Abstract

A field experiment was conducted at Regional Research Station, Tamil Nadu Agricultural University, Paiyur, Tamil Nadu, India during the Summer of 2022 to study the effect of herbicide combination and non-chemical weed management techniques in puddled direct seeded rice. The experiment was laidout in a randomized block design with ten treatments and three replications. The treatments include Pre emergence (PE) Pyrazosulfuron ethyl 10% WP @ 20 g ha-1, Pyrazosulfuron ethyl 70% WDG @ 21 g ha-1, Post emergence (PoE) Bispyribac sodium 10% SC @ 25 g ha-1, Power weeder, Hand weeding (HW), Weed free and Weedy check. The results revealed that, among different weed control treatments, PE application of Pyrazosulfuron ethyl 10% WP @ 20 g ha-1 on 3 DAS fb (PoE) Bispyribac sodium 10% SC @ 25 g ha-1 on 20 DAS fb Power weeder at 30 DAS fb Hand weeding at 45 DAS (T5) recorded higher grain yield of 5422 kg ha-1 and B: C ratio of 2.35. The higher weed control efficiency of 83.52 % and 55.47 % was recorded at 30 and 60 DAS. Hence,it can be concluded that combination of PE (Pyrazosulfuron ethyl 10% WP @ 20 g ha-1 on 3 DAS) and POE (Bispyribac sodium 10% SC @ 25 g ha-1 on 20 DAS) herbicides along with non-chemical weed management technique (power weeder at 30 DAS and HW at 45 DAS) was found to be effective for weed control in direct seeded puddled lowland rice to deal with the issues of labour shortage and weed infestation faced by farmers.