Evaluation of post emergence herbicides on weed control in rice nursery
2010
Rao, A.S. (Ranga Agricultural Univ. (India). Integrated Weed Management Unit) | Ratnam, M. (Ranga Agricultural Univ. (India). Integrated Weed Management Unit)
A field experiment was conducted during rainy seasons of 2007-08 and 2008-09 to evaluate different post emergence herbicides like cyhalofop butyl 100 g per ha, bis-pyribac-sodium 20 to 50 g per ha, propaquizafop 50 g per ha, ethoxy sulfuron 15 g per ha, 2,4-D Na salt 800 g per ha, alone and tank mixture of cyhalofopbutyl 100 g per ha + ethoxy sulfuron 15 g per ha 2,4-D Na salt 800g per ha for broad spectrum weed control in rice nursery. Results revealed that all the herbicidal treatments significantly reduced total weed density and dry weight over unweeded check. Among the treatments, post emergence application of bis-pyribac-sodium 30 g per ha applied 15 at DAS (days after sowing) significantly reduced total weed density, dry weight and was on par with its higher doses of 40 and 50 g per ha with weed control efficiency of 74 to 79 percent. Among the treatments, post emergence application of propquizafop 50 g per ha caused severe stand loss of rice (90 percent) by 14 days after application. Whereas, bis-pyribac-sodium at higher dose of 50 g per ha also caused slight injury, but crop recovered with in 14 days after application. Tank mixing of cyhalofop butyl 100 g per ha with 2, 4-D Na salt 800 g per ha or ethoxy sulfuron 15 g per ha did not offer any additional advantage compared to bis-pyribacsodium 30 g per ha.
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