A field experiment was conducted during Kharif 2017 and 2018 at l.G.K.V, Raipur, Chhattisgarh to study the effect of existing herbicides in managing weeds in direct-seeded rice (Oryza saliva L.) and to assess their residual effect on succeeding crops.Application of bispyribac-sodium 2% (BS) + 2,4-D sodium salt 54.3% SP (DSS) with adjuvant (WA) (30.0 + 814.5 g/ha), BS + 2,4-DSS (WA) (25.0 + 678.75 g/ha), BS+ 2,4-DSS (30.0 + 814.5 g/ha) and BS + 2,4-DSS (WA) (20.0 + 543.0 g/ha) was at par to weed freein terms of grain yield. BS + 2,4- DSS (WA) (30.0 + 814.5 g/ha) controlled the weeds more effectively throughout the crop growth period and recorded higher weed control efficiency (97.5% at 30 DAS and 92.4% at 60 DAS), herbicide efficiency index (47.1 and 13.2), reduction of weed density (88.1 and 80.6%) and weed biomass (97.5 and 92.4%) and lower weed persistence index (0.2 and 0.4) during both the years. The phytotoxicily effect was observed with higher doses of BS + 2,4-DSS, alone and with adjuvantat 25.0 + 678.8 g/ha and 30.0 + 814.5 g/ha, however it was recovered quickly. There was no phytotoxicity and carryover effect of these herbicides tested on chickpea + linseed intercrop, grown as succeeding crop. Application of BS + 2,4-DSS (WA) (30.0 + 814.5 g/ha) recorded highest net returns (65444 and 76762/ha) and B:C ratio (2.2 and 2.6) during 2017 and 2018, respectively.
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