Vol. 16 No. 1
Bio-efficacy of herbicides weed management in groundnut under lateritic soil of West Bengal
Abstract: A field experiment was carried out during rabi season at Agricultural Farm, Palli Siksha Bhavana (Institute of Agriculture), Visva-Bharati, Sriniketan, Birbhum to study ‘Effect of fomesafen + fluazifop-p-butyl on growth and productivity of ground nut in lateritic soil of West Bengal’ during 2017-18. The experimental soilcontains high percentage of sand (62.0%) and low percentage of clay (25.5%). The soil was somewhat acidic, low in soil organic carbon, available nitrogen and phosphorus whereas potassium content in soil is medium. The experiment was laid out in randomized block design with ten treatments i.e. T1-Fomesafen + fluazifop-p-butyl @ 100+100g ha-1, T2-Fomesafen + fluazifop-p-butyl @ 125+125 g ha-1, T3-Fomesafen + fluazifop-p-butyl @ 150+150 g ha-1, T4-Fomesafen + fluazifop-p-butyl @ 175+175 g ha-1, T5-Fomesafen + fluazifop-p-butyl @ 250+250 g ha-1, T6-Imazethapyr @100.0 g ha-1, T7- Fluazifop-p-butyl + fomesafen@ 125+125 g ha-1 (Fusiflex), T8-Hand Weeding at 15 and 30 Days after Sowing (DAS), T9-Weedy check and T10-Weed free check and replicated thrice. Result showed that weed management had positive and favourable influence in improving plant height, yield attributes like number of pods plant-1, number of kernel pod-1 and 100 kernel weight of groundnut under study. The doses of fomesafen + fluazifop-p-butyl at (125+125,150+150, 154.4 and 250+250 g ha-1) significantly reduced the weed infestation and registered lower weed density, weed dry weight, weed index, higher weed control efficiency and yield attributes and yield of groundnut over T6-Imazethapyr @ 100.0 g ha-1, T7- Fluazifop-p-butyl + fomesafen @ 125+125 g ha-1 (Fusiflex) and at par with two hand weeding. Although fomesafen + fluazifop-p-butyl at 175+175 g ha-1 registered the higher gross return, net return and B:C ratio but it was at par with fomesafen + fluazifop-p-butyl @125+125 g ha-1, fomesafen + fluazifop-p-butyl at150+150 g ha-1 and fomesafen + fluazifopp- butyl @250+250 g ha-1. Fomesafen+ fluazifop-p-butyl @125+125 g ha-1 appeared as effective and economic for managing broad spectrum weedsof rabi ground nut in lateritic soil of West Bengal.
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