Integrated weed management for control of complex weed flora in direct-seeded upland rice under Southern transition zone of Karnataka

A field experiment was conducted during summer 2014 and 2015 at Agriculture and Horticultural Research Station, Kathalagere Davanagere district (Zone-7, Southern Transition Zone, Karnataka), to study the effect of various weed management practices on weed density, weed dry weight, yield and economics of direct seeded rice. The experiment consists of ten treatments replicated thrice in a randomized complete block design. Among the various treatments, three hand weeding (20,40 and 60 DAS) recorded significantly higher rice grain (4.04 t/ha and 3.64 t/ha) and straw (6.3 t/ha and 6.52 t/ha) yields in 2014 and 2015, respectively and it was found at par with pendimethalin 1.0 kg/ha at 2 DAS fb bispyribac sodium 25 g/ha fb manual weeding (3.87 t/ha, 6.0 t/ha in 2014 and 3.5 t/ha and 6.4 t/ha in 2015, respectively). Higher net returns and benefit: cost ratio of ‘ 28965 and 2.0 and ‘ 41402 and 2.4 in 2014 and 2015, respectively were obtained with pendimethalin 1.0 kg/ha fb bispyribac sodium 25 g/ha as postemergence with manual weeding.