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Indian Journal of Agronomy
Year : 2019, Volume : 64, Issue : 4
First page : ( 471) Last page : ( 475)
Print ISSN : 0537-197X. Online ISSN : 0974-4460.

Effect of weed-management practices on system of rice (Oryza sativa) intensification under southern dry zone of Karnataka

Yogananda S. B.1,*, Thimmegowda P.2, Shruthi G. K.3

University of Agricultural Sciences, V.C. Farm, Mandya, Karnataka, 571 405

1Associate Professor, Department of Agronomy, Zonal Agricultural Research Station, V.C. Farm, Mandya, Karnataka, 571 405

2Senior Farm Superintendent, Zonal Agricultural Research Station, V.C. Farm, Mandya, Karnataka, 571 405

3Senior Research Fellow, College of Agriculture, V.C. Farm, Mandya, Karnataka, 571 405

*Corresponding author's e-mail: sbyogananda@gmail.com

Online published on 20 July, 2020.

Abstract

A field experiment was conducted during the rainy season (kharif) of 2014 and 2015 at Zonal Agricultural Research Station, V.C. Farm, Mandya, Karnataka, to know the effect of weed-management practices on system of rice intensification (SRI) method of rice (Oryza sativa L.) cultivation under southern dry zone of Karnataka. The experiment consisted of 8 treatments, replicated thrice in a randomized complete block design. Among the various treatments, weed-free check recorded significantly higher grain yield (6.04 t/ha) and it was found at par with herbicide treatment, viz. pre-emergence application of bensulfuron-methyl 0.6% + pretilachlor 6% GR (Londax Power) @ 10 kg/ha fb post-emergence application of bispyribac sodium (Nominee Gold) @ 25 g/ha at 20 days after sowing (DAS) (5.53 t/ha). Among the weed the management practices, pre-emergence application of bensulfuron-methyl 0.6% + pretilachlor 6% GR (Londax Power) @ 10 kg/ha fb post-emergence application of bispyribac sodium (Nominee Gold) @ 25 g/ha at 20 days after sowing (DAS) found effective in control of all types of weeds and registered higher net monetary returns (53,270/ha) and benefit: cost ratio (2.80). Uncontrolled weed growth caused 49.5% reduction in grain yield.

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Keywords

Butachlor, Bispyribac-sodium, Economics, Sequential application, Weeds, Yield.

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