Crop Establishment Methods and Weed Management Practices on Rice

The density and dry weight of total weeds at all the stages were found the lowest under TPR except at the harvest stage where TPR was recorded as almost similar to that of WSR. Bispyribac sodium 20 g/ha at 15 DAS/DAT fb one HW at 35 DAS/DAT, being at par with penoxsulam 22.5 g/ha at 2-3 leaf stage of weeds fb one HW at 35 DAS/DAT recorded the lowest density and dry weight of total weeds. The maximum nitrogen, phosphorus, and potassium uptake by weeds were recorded under direct dry seeded rice and the lowest with transplanted rice. Uncontrolled weeds on average depleted 66.15 kg N, 17.70 kg P, and 43.19 kg K/ha, which was significantly higher than the rest of the treatments. Bispyribac sodium 20 g/ha at 15 DAS/DAT fb one HW at 35 DAS/DAT accumulated the lowest nitrogen, phosphorus, and potassium which was closely followed by application of penoxsulam 22.5 g/ha at 2-3 leaf stage of weeds fb one HW at 35 DAS/DAT. Transplanted rice yielded 9.55 & 17.11 and 10.30 & 18.55 percent higher over crop raised through wet seeding and direct dry seeding during 2011 and 2012, respectively which was due to more number of panicles/m2.