Efficacy of Herbicides against Weeds in Transplanted Rice (Oryza sativa L.)

Aims: To assess the efficacy of different post emergent herbicides against weeds in transplanted rice.

Place and Duration: An experiment was conducted during Kharif 2015 and summer 2016 at Agricultural Research Station, Dhadesugur, University of Agricultural Sciences, Raichur, Karnataka, India.

Methodology: The experiment comprised of eight treatments and replicated thrice. The complete block design was adopted. The weeds, which were dominant in trials field are Echinochloa sp. Panicum repens, Cynodon dactylon and Leptochloa chinensis among grasses, Eclipta alba and Ludwigia parviflora as broad leaf weeds and Cyperus sp. as sedge.

Results: All the weed management treatments gave significantly (p=0.05) higher grain yield of rice over weedy check. However, among weed management herbicidal treatments, post emergent application of BAS 9548 H (Penoxsulam 10 g/l + Bentazone 360 g/l SC) @ 3000 ml/ha recorded significantly (p=0.05) higher grain yield followed by the application of BAS 9548 (Penoxsulam 10 g/l + Bentazone 360 g/l SC) @ 2500 ml/ha and twice hand weeding at 15 and 30 days after sowing.However, maximum cost benefit ratio was observed in plots treated with BAS 9548 H (Penoxsulam 10 g/l + Bentazone 360 g/l SC) along with twice hand weeded check compared to other herbicide treatments and weedy check in transplanted rice.

Conclusion: Post emergent application (20-22 days after transplanting) of BAS 9548 H (Penoxsulam 10 g/l + Bentazone 360 g/l SC) @ 3000 ml/ha was controlled all types weeds in transplanted rice.