EFFICACY OF HERBICIDE MOLECULE FOR WEED MANAGEMENT IN TRANSPLANTED PADDY FOR KODAGU REGION
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Date
2017-08-12
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University of Agricultural & Horticultural Sciences, Shivamogga
Abstract
A field experiment entitled ‘Efficacy of herbicide molecule for weed management in transplanted paddy for Kodaguregion’ was conducted duringKharif2016 at AHRS, Ponnampet to screen suitable herbicidesfor weed management in paddy. The herbicides tried were butachlor @ 30kg ha-1 at 3 DAT, oxadiargyl @ 100 g a.i.ha-1 at 3 DAT,bensulfuron methyl@ 60 g a.i. ha-1 + pretilachlor @ 600 g a.i. ha-1 at 3 DAT, ethoxysulfuron @ 18.75 ga.i.ha-1 at 20 DAT, bispyribac-Na @ 20 g a.i.ha-1 at 20 DAT, penoxsulum @ 22.5 g a.i. ha-1 at 20 DAT and 2,4 D at 2.5 kg ha-1 at 3 weeks after transplanting.Hand weeding twice at 20 and 40 DATand weedy check treatments were also included for comparison.The predominant weed flora observed in the experimental field includesFimbristylismiliacea, Echinochloaspp., Monochoriavaginalis,Ammanniabaccifera and Ludwigiaparviflora. Among herbicides, sequential application of oxadiargyl followed by penoxsulum recorded significantly lower weed population (10.60to 34.28 /0.25 m2) and dry weight (0.94to 3.46 g / 0.25m2) as which resulted in significantly higher grain yield (4068kg ha-1). It was closely followed by combined application of oxadiargyl@ 100 g a.i. ha-1 at 3 DAT followed by bispyribac-Na @ 20 g a.i. ha-1 at 20 DAT yielded 3907 kg ha-1 with moderate control of weeds. Weedy check recorded 55.23 per cent reduction in grain yieldcompared to the above treatment. Major nutrients uptake by paddy crop was significantly higher while it was lower in weeds by all weed control treatments compared to weedy check. The maximum net returns of ` 29,962 ha-1 and profit of 1.63 per every rupee spent was achieved with the same treatment.
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