Vol. 16 No. 3
Herbicide combinations for enhancing the weed control efficiency in wet direct-seeded rice
Author(s): L. SEKHAR, M. AMEENA AND N. JOSE
Abstract: The efficacy of herbicide combinations on weed control was evaluated during the 2018 and 2019 kharif seasons at the Integrated Farming System Research Station, Karamana, Thiruvananthapuram of Kerala Agricultural University, India, by conducting field experiments. The major dominant weeds in the field were Leptochloa chinensis, Echinochloa colona, Sphenocleaa zeylanica, Bergia capensis, Monochoria vaginalis, Limnocharis flava, Cyperus iria, Cyperus difformis and Fimbristylis miliacea. Tank mix application of bispyribac sodium with cyhalofopbutyl or fenoxaprop-p-ethyl improved broad spectrum weed control compared to their individual application. A combination of herbicides increased weed control efficiency by 36-50% compared to the sole application of herbicide broad spectrum herbicide bispyribac sodium. The herbicide combinations bispyribac sodium plus fenoxaprop-p-ethyl, penoxsulam plus cyhalofop butyl (6% OD) and bispyribac sodium plus cyhalofop butyl resulted in the highest weed control efficiency and grain yield. Herbicide combinations increased grain yield to 16-28% than sole application and 56-59% than the weedy check. A combination of the stale seedbed followed by glyphosate plus oxyfluorfen at 15-20 days after land preparation followed by either bispyribac sodium plus fenoxaprop-p-ethyl, bispyribac sodium plus cyhalofop butyl or penoxsulam plus cyhalofop butyl could be a viable option in managing a broad spectrum of weeds especially in areas with high soil weed seed bank. The study also signifies the importance of herbicide combinations for managing complex weed flora and enhanced the weed control efficiency in DSR and will reduce the development of herbicide resistance and weed shift.
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