Crop geometry and weed management practices in aerobic rice (Oryza sativa L.)
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Date
2018-07
Authors
Kaushik, Vasundhara
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
A field experiment was conducted during kharif season of 2017 at of N.E. Borlaug Crop Research Centre of G.B. Pant University of Technology, Pantnagar (Uttarakhand) to evaluate “Crop Geometry and Weed Management Practices in aerobic Rice”. The experiment was aimed to optimize row spacing vis weed management in aerobic rice and the impact of treatments on weed and crop growth and ultimately on yield of crop. The soil of the experimental site was silty clay loam having organic carbon (0.84 %), available nitrogen (180.2 kg/ha), available phosphorous (18.2 kg/ha) and potassium (210.5 kg/ha). Rice variety: “Pant dhan 18” was sown on June 9th 2017 and harvested on 12 Oct 2017. The experiment was laid out in split plot design with four replications to evaluate twelve treatments (three row spacing in the main- plot 20cm, 25cm and 30cm and four weed management practices in sub-plots i.e. weedy check, Preemergence application of pendimethalin 1000 kg fb post-emergence penoxsulam 22.5g/ha, post-emergence application of cyhalofop-butyl 150 g/ha and weed free). Echinochloa colona , Cyperus iria, Cyperus difformis , Alternanthera sessilis were the major weeds recorded in the experimental plot. Pre-emergence application of pendimethalin 1000 kg/ha fb penoxsulam 22.5 g/ha along with the row spacing of 25 cm was found most effective in reducing the density as well as the dry matter accumulation of weeds as compared to the sole application of the post-emergence herbicide cyhalofop-butyl + penoxsulam 150 g/ha and rest of the treatment. The yield and yield attributing characters were influenced according to the effectiveness of the treatments. Among the different row spacing 25cm spacing recorded the highest the grain yield (4.2t/ha) followed by the 20cm row spacing (4.0t/ha) while among the weed management practices sequential application of pendimethalin 1000 kg/ha applied as pre fb post-emergence application of penoxsulam 22.5 g/ha recorded highest grain yield (4.4 t/ha) fb the cyhalofop-butyl + penoxsulam 150 g/ha applied as post-emergence (4.3t/ha). The highest benefit cost ratio was recorded in pre and post emergence application of pendimethalin 1000 kg/ha and penoxsulam 22.5 g/ha followed by the post –emergence application of cyhalofopbutyl + penoxsulam 150 g/ha which suggest that sequential application of pre and post- emergence herbicide along with the 25cm row spacing was found to be effective in controlling the weeds and also give higher yield under aerobic rice.
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