Vol. 7 No. 2
Weed dynamics, shift in weed flora and weed control practices in jute (Corchorus olitorius L.) under terai agro-climatic region of West Bengal
Abstract: Field experiments were conducted at research farm of Uttar Banga Krishi Viswavidyalaya, Pundibari, Cooch Behar, West Bengal as well as farmers\' field during the pre-Kharif season of 2006 and 2007 to generate information on weed dynamics, shifting of weed flora and to work out weed control practices with its economics in jute. In weed dynamics with periodical emergence of weeds, major weeds wereCyperus rotundus, Cynodon dactylon (20 days after sowing - DAS), Cyperus iria,Cynodon dactylon, Ageratum conyzoides, Ludwigia parviflora (40-60 DAS), Cynodon dactylon, Setaria glauca, Paspalum scrobiculatum, Cyprus iria, Fimbristylis miliacea,Ageratum conyzoides, Spilanthes calva, Spilanthes paniculata and Ludwigia parviflora(60 DAS onwards). In weed control practices, fluchloralin @ 0.70 kg ha-1 as pre-plant surface application followed by grubber at 30 DAS was effective in controlling weeds with high fibre yield, highest net return and highest benefit:cost ratio of 26.3 q ha-1, Rs. 24,397/- and 1.52, respectively, obtained in farmers\' field in 2007. Mulching with rice straw @ 10 t/ha followed by hand weeding at 25 DAS was also effective in controlling weeds and registering high fibre yield (24.1 to 29.4 q ha-1 on farmers \'field in 2006 and 2007). However, cost involved in rice straw reduced the net return and benefit:cost ratio. Stale seedbed followed by grubber at 30 DAS was effective in controlling weeds, however, delay in sowing for the period of 10 to 15 days resulted in significant reduction on crop performance. Post-emergence herbicide quizalofop ethyl @ 50 g ha-1 ai 20 DAS was effective on grasses only, but could not lower weed pressure of sedges and broadleaved weeds and gave lower fibre yield. Fluchloralin @ 1.00 kg ha-1 as pre-emergence caused phytotoxicity to jute plant and hence not suggested.
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