Weed management in direct seeded rice under rainfed lowland ecosystem
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Date
2015
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Rajendra Agricultural University, Pusa (Samastipur)
Abstract
A field experiment entitled “Weed management in direct seeded rice under rainfed lowland ecosystem” was carried out at the Agricultural Research Farm, Rajendra Agricultural University, Pusa, Samastipur, Bihar (India), during kharif season of 2014to evaluate the efficiency of different herbicides and their impact on yield and economic of direct seeded rice.
The soil of the experimental field was calcareous (clay- loam) with pH 8.43. It was moderately fertile being low in organic carbon (0.46 %), available nitrogen(242 kg N ha-1),phosphorus (18.38 kg P2O5 ha-1) andpotassium (111 kg K2O ha-1). The factors under study comprised of 12 weed management treatments on direct seeded rice. T1-Weedy check, T2-Weed free(3 hand weedings at 20,40 and 60 DAS), T3-Pendimethalin 1 l/ha(2 DAS) fb Bispyribac-Na 30 g/ha + Azimsulfuron 30 g/ha in tank mix (20 DAS), T4-Pendimethalin 1 l/ha(2 DAS) fb Bispyribac-Na 30 g/ha + Azimsulfuron 15 g/ha in tank mix (20 DAS),T5-Pendimethalin 1 l/ha(2 DAS) fb Bispyribac-Na 15 g/ha + Azimsulfuron 30 g/ha in tank mix (20 DAS), T6-Pendimethalin 1 l/ha(2 DAS) fb Bispyribac-Na 15 g/ha + Azimsulfuron 15 g/ha in tank mix (20 DAS), T7-Pendimethalin 1 l/ha(2 DAS) fb Pendimethalin 1 l/ha + Bispyribac-Na 30 g/ha in tank mix (20 DAS), T8-Pendimethalin 1 l/ha(2 DAS) fb Pendimethalin 1 l/ha + Bispyribac-Na 15 g/ha in tank mix (20 DAS), T9-Bispyribac-Na 30 g/ha + Pyrazosulfuron 25 g/ha in tank mix (20 DAS), T10-Bispyribac-Na 30 g/ha + Ethoxysulfuron 18.5 g/ha in tank mix(20 DAS), T11-Pendimethalin 1 l/ha (2 DAS) fb Bispyribac-Na 30 g/ha (20 DAS) + Hand weeding (40 DAS), T12-Brown manuring with Sesbenia aculeate at 35 DAS.The experiment was conducted in RBD design and was replicated thrice taking rice variety Swarna Sub-1 as a test crop with RDF- 80-40-20-25 kg N-P2O5-K2O-ZnS04 per ha, respectively.Other crop management practices were performed as per standard package of practices.Among different weed management treatments on direct seeded rice, T2-Weed free (3 hand weedings at 20,40 and 60 DAS) had registered the maximum growth, yield attributes and yield of direct seeded rice, which remain comparable to T11-Pendimethalin 1 l/ha (2 DAS) fb Bispyribac-Na 30 g/ha (20 DAS) + Hand weeding (40 DAS), T3-Pendimethalin 1 l/ha (2 DAS) fb Bispyribac-Na 30 g/ha + Azimsulfuron 30 g/ha in tank mix (20 DAS), T5-Pendimethalin 1 l/ha (2 DAS) fb Bispyribac-Na 15 g/ha + Azimsulfuron 30 g/ha in tank mix (20 DAS), T4-Pendimethalin 1 l/ha (2 DAS) fb Bispyribac-Na 30 g/ha + Azimsulfuron 15 g/ha in tank mix (20 DAS), and T12-Brown manuring with Sesbenia aculeate at 35 DAS.The maximum weed control efficiency and lowest weed population, weed dry weight andweed index were recorded under treatment T2-Weed free(3 hand weedings at 20,40 and 60 DAS).The maximum nutrient content and nutrient uptake were registered under T2-Weed free (3 hand weedings at 20,40 and 60 DAS). The highest net return gained withT12-Brown manuring with Sesbenia aculeate at 35 DAS, which was significantly superior over T2-Weed free (3 hand weedings at 20, 40 and 60 DAS) and T1-Weedy checkwhich wasstatistically at par with rest of the treatments and benefit : cost ratio was also obtained maximum under T12- Brown manuring with Sesbenia aculeate at 35 DAS and significantly superior to rest of the treatments.
On the basis one year data, among different weed management treatments applied on direct seeded rice, T3-Pendimethalin 1 l/ha (2 DAS) fb Bispyribac-Na 30 g/ha + Azimsulfuron 30 g/ha in tank mix (20 DAS) had efficiently control the complex weed flora.T2-Hand weeding (Thrice) was found best interms of yield and yield attributing characters and T12-Brown manuring with Sesbenia aculeate at 35 DAS was found superior in terms of economics.
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