System of Rice Intensification (SRI), Weed management, Weed control efficiency, Yield, Economics

A field experiment was conducted at Anbil Dharmalingam Agricultural College and Research Institute, Thiruchirappalli during Rabi season 2014-15 to evaluate the weed management practices in system of rice intensification contisted 8 treatments with three replication. Pre-emergence (PE) application of bensulfuron-methyl 60 g/ha + pretilachlor at 600 g/ha on 3 days after transplanting (DAT) fb early post-emergence application of bispyribac-sodium at 25 g/ha on 20 DAT registered the minimum total weed density (6.6, 8.8 and 14.3/m2 at 30, 45 and 60 DAT, respectively) along with higher weed control efficiency (WCE). The highest grain and straw yields of 5.72 and 8.36 t/ha, respectively and net returns and BCR of ` 55436/ha and 2.44, respectively were obtained in application of the same treatment