Vol. 10 No. 2
Weed management in rice – soybean intercropping system under rainfed condition of Marathwada region of Maharshtra
Author(s): K. T. Jadhav, V. P. Surywanshi and U. N. Alase
Abstract: A field experiment was conducted in medium black soil with slightly alkaline in reaction in 2011, 2012 and 2013 at Upland Paddy Research Scheme, Research farm, VNMKV, Parbhani (Maharashtra). Rice variety ‘Parag’was sown with 30 cm row spacing and 60 kg seed rate ha-1. Soybean variety ‘MAUS-71’ was sown as intercrop with the seed rate of 75 kg ha-1 as per the treatments. Experiment was laid out in split plot design with three replications. In main plot four weed control methods and in sub-plots five intercropping treatments were followed. Soil was low in nitrogen, ferrous and zinc; medium in phosphorous and rich in potash. Rainfall during experimental period was 636 mm, 678 mm, 1134 mm in cropping season during 2011, 2012 and 2013, respectively. Significantly highest rice grain equivalent yield, gross monitory return, net monitory return was observed with pendimethalin @ 0.75 kgha-1 followed by one hand weeding at 25 days after sowing over rest of the weed management practices, however, it was at par with two hand weedings at 20 and 45 days after sowing for rice grain equivalent yield and gross monitory return in all the three years. Moreover, pendimethalin @ 0.75 kgha-1 followed by one hand weeding at 25 days after sowing recorded lowest weed dry matter and highest weed control efficiency in 2011-12, 12-13 and 13-14. In pooled analysis, pendimethalin @ 0.75 kgha-1 followed by hand weeding at 25 DAS recorded highest rice grain equivalent yield. Significantly highest rice grain equivalent yield, gross monitory return, net monitory return was observed with rice + soybean intercropping at the ratio of 3:2 over rest of the intercrop treatments in all the three years. Significantly highest rice grain equivalent yield was obtained with rice + soybean intercropping with the ratio of 3:2 in pooled results.Amongst various interactions, highest rice grain equivalent yield was obtained with pendimethalin @ 0.75 kg ha-1followed by one hand weeding at 25 days after sowing for rice + soybean intercropping at the ratio of 3:2 over rest of the interactions of weed management and intercropping of rice + soybean in all three years and pooled analysis....
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