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Indian Journal of Agronomy
Year : 2008, Volume : 53, Issue : 2
First page : ( 149) Last page : ( 151)
Print ISSN : 0537-197X. Online ISSN : 0974-4460.

Integrated weed management in jute (Corchorus olitorius)

Ghorai A.K.

Central Research Institute for Jute and Allied Fibres, Barrackpore, West Bengal, 700 120.

*Corresponding author: (E-mail: ghorai1960@yahoo.co.in)

Received:  March,  2008.

Abstract

An experiment was conducted at Barrackpore during 2003–2005 to find out suitable eco-friendly and remunerative integrated weed-control approaches for jute cv ‘JRO 524’ (‘Navin’). 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 ‘Jabakusum’), white amaranth (Amarantus spp.) and summer radish (Raphanus sativus L. cv ‘Paus mula’] 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 (DT50 < 1d) @ 60 g/ha + dhanuvit @ 0.5 to 0.6 l/ha (adjuvant) at 21 DAE combined with 1 hand weeding produced 3.87 t/ha jute fibre. The benefit: cost ratio from conventional, cultural, 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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Key words

Economics, Fibre yield, Herbicide, Integrated weed management, Mixed cropping, Mulching, Weed smothering.

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