Weeds and Weed Management of Rice in Karnataka State, India

Rao, A N and Wani, S P and Ramesha, M and Ladha, J K (2015) Weeds and Weed Management of Rice in Karnataka State, India. Weed Technology, 29 (1). pp. 1-17. ISSN 0890-037X

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Rice is one of the staple food crops of India, and Karnataka is one of the major rice-producing states. The primary method of rice establishment in Karnataka is transplanting, but farmers are opting to shift to direct-seeding of rice. Weed management is critical for realizing optimal yield of direct-seeded rice (DSR). The objective of this review was to synthesize the published literature on weeds and weed management in rice in Karnataka, identify improved weed-management technologies for delivery to farmers, and suggest research needs. Some 98 weed species are reported to be associated with rice in Karnataka. Weed control to date in Karnataka has mostly been based on herbicides. Hand-weeding was found to be effective in all methods of rice establishment. However, it is time-consuming, tedious, and costly because labor is becoming scarce and unavailable, and labor wages are higher. Several PRE and POST herbicides that were effective in other Asian countries were also found to be effective in managing weeds in rice established by different methods in Karnataka. Bensulfuron plus pretilachlor and pyrazosulfuron in aerobic rice and pendimethalin, thiobencarb, bispyribac-sodium, cyhalofop, fenoxaprop plus chlorimuron plus metsulfuron, and fenoxaprop plus ethoxysulfuron in dry-DSR were found effective in managing weeds. In wet-DSR, butachlor plus safener and pretilachlor plus safener were effective. Thiobencarb, pendimethalin, pretilachlor, azimsulfuron plus metsulfuron, bispyribac-sodium, butachlor, cinosulfuron, oxadiazon, and quinclorac were found promising for weed management in transplanted rice. Integration of herbicides with hand-weeding or intercultivation was found to be effective in rice established by different methods. Options that were found economical in managing weeds varied across the different rice-establishment methods. The need for developing location-specific, sustainable, integrated weed management and extension of available technologies for the farming community in Karnataka is emphasized.

Item Type: Article
Divisions: RP-Resilient Dryland Systems
CRP: CGIAR Research Program on Dryland Systems
Uncontrolled Keywords: Aerobic rice, Dry direct-seeded rice, Integrated weed management, Transplanted rice, Wet direct seeded rice ; Weed Science ; Weed Management; Karnataka; Rice
Subjects: Others > Agriculture-Farming, Production, Technology, Economics
Depositing User: Mr B K Murthy
Date Deposited: 07 Apr 2015 05:05
Last Modified: 21 Feb 2018 08:24
URI: http://oar.icrisat.org/id/eprint/8646
Official URL: http://dx.doi.org/10.1614/WT-D-14-00057.1
Projects: Bhoochetana Plus
Funders: Government of Karnataka
Acknowledgement: Authors are Thankful to the Government of Karnataka
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