Impact of integrated weed management on dry direct seeded rice (Oryza sativa L.) under irrigated ecosystem
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Date
2018-06
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
A field experiment was conducted during 2017 at N.E. Borlaug Crop Research Centre of Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, to evaluate "Impact of integrated weed management on dry Direct Seeded Rice (Oryza sativa L.) under irrigated ecosystem". The experiment was conducted with the objectives to find out the suitable integrated method of weed management for reduction of weeds, good crop growth, higher yield and economics of different weed management treatments. The experiment was laid out in randomized block design with three replication and twelve treatments stale seed bed with shallow tillage fb post emergence application of penoxsulam (PoE) at 22.5g/ha, stale seed bed with shallow tillage fb pre emergence application of pendimethalin (PE) at 1000 g/ha along with 1 hand weeding (HW) 30DAS, stale seed bed with shallow tillage fb application of preemergence application of pendimethalin fb 1 mechanical weeding (MW) with conoweeder at 25 DAS along with 1HW at 45 DAS, mulch (wheat straw of 4t/ha) fb post emergence application of penoxsulam at 22.5g/ha fb 1HW at 45 DAS, post emergence application of penoxsulam at 22.5g/ha fb 1HW at 45 DAS, Sesbania line sowing with pre-emergence application of Pendimethalin fb 1 mechanical weeding fb 1HW at 45 DAS, Sesbania broadcasting fb brown manuring with 2,4-d at 500 g/ha (brown manuring with) along with 1 HW at 45 DAS, stale seed bed with shallow tillage fb Sesbania line sowing fb preemergence pendimethalin fb brown manuring with 2,4-D at 500 g/ha fb1 HW at 45 DAS, pre emergence application of pendimethalin fb penoxsulam (PoE) fb 1HW 45 DAS, pre-emergence application of pendimethalin fb penoxsulam (PoE) fb 1HW 45 DAS (20cm), weedy check and weedy free. All the treatments were in 25 cm except one. The main weed species observed in the experimental field were Echinochloa cruss:galli, Echinochloa colona, Leptochloa chinensis, Cyperus irea, Cyperus difformis, Ammania baccifera and Alternanthera sessilis. However maximum reduction in weed density and dry matter accumulation was recorded under recommended practice with narrower spacing (20cm) followed by pre emergence application of pendimethalin fb penoxsulam(PoE) fb 1HW 45 DAS at 25 cm spacing which was statistically at par with stale seed bed with shallow tillage fb application of pre-emergence application of pendimethalin fb 1 mechanical weeding (MW) with conoweeder at 25 DAS along with 1HW at 45 DAS, mulch fb penoxsulam (PoE) fb 1HW at 45 DAS, Sesbania line sowing with pre-emergence application of Pendimethalin fb 1 mechanical weeding fb 1HW at 45 DAS and stale seed bed with shallow tillage fb Sesbania line sowing fb pre-emergence pendimethalin fb brown manuring with 2,4-D at 500 g/ha fb1 HW at 45 DAS. Higher yield and yield attributing characters were recorded under pre emergence application of pendimethalin fb penoxsulam(PoE) fb 1HW 45 DAS at 25 cm spacing which was statistically at par with stale seed bed with shallow tillage fb application of pre-emergence application of pendimethalin fb 1 mechanical weeding (MW) with conoweeder at 25 DAS along with 1HW at 45 DAS, mulch fb penoxsulam (PoE) fb 1HW at 45 DAS, Sesbania line sowing with pre-emergence application of Pendimethalin fb 1 mechanical weeding fb 1HW at 45 DAS and stale seed bed with shallow tillage fb Sesbania line sowing fb pre-emergence pendimethalin fb brown manuring with 2,4-D at 500 g/ha fb1 HW at 45 DAS. Whereas, benefit cost ratio was found higher (2.1) under pre emergence application of pendimethalin fb penoxsulam(PoE) fb 1HW 45 DAS at 25 cm spacing which was statistically at par with stale seed bed with shallow tillage fb application of pre-emergence application of pendimethalin fb 1 mechanical weeding (MW) with conoweeder at 25 DAS along with 1HW at 45 DAS, mulch fb penoxsulam (PoE) fb 1HW at 45 DAS and Sesbania line sowing with pre-emergence application of pendimethalin fb 1 mechanical weeding fb 1HW at 45 DAS.
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