Integrated weed management in jute (Corchorus olitorius)
2008
Ghorai, A.K.
An experiment was conducted at Barrackpore during 2003-2005 to find out suitable eco-friendly and remunera-tive integrated weed-control approaches for jute cv EiRO 524f (eNavinf). Cultural, organic and integrated chemical weed-control methods were found better than conventional manual weeding twice. In cultural method, smothering of weeds by leafy vegetable mixtures [red amaranth (Amaranthus tricolor L., cv Ealabakusumf), white amaranth (Amarantus spp.) and summer radish (Raphanus sativus L. cv EPaus mulaf] in jute, reduced the dry matter of weeds up to 45 when the field was dominated by grasses and broad-leaf weeds. This was followed by two manual weedings which gave 3.57 t/ha jute fibre (along with 2.9 t/ha red amaranth, 0.6 t/ha white amaranth and 0.7 t/ha summer radish, respectively). The organic approach, rice straw mulch @ 10 t/ha and mixed cropping with same vegetables, followed by one manual weeding produced 3.9 t/ha jute fibre (1.15, 0.64 and 0.94 t/ha red and white amaranth and summer radish, respectively). It reduced the dry matter of weeds by 68 to 82. In integrated chemical approach, spray of quizalofop ethyl (DT 50 1 d) @ 60 g/ha + dhanuvit @ 0.5 to 0.6 I/ha (adjuvant) at 21 DAE combined with 1 hand weeding produced 3.87 t/ha jute fibre. The benefit: cost ratio from conventional, cul¬tural, organic and chemical approaches was 1.50, 1.57, 2.19 and 1.66 respectively. The residue of quizalofop ethyl was found below the detectable limit (0.84 to 4.2 ppm) within 8 days of its application.
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