Vol. 6, Issue 6 (2018)
Efficacy of herbicide molecules to control composite weed flora in transplanted Paddy for Kodagu region
Author(s): Rajath HP, Jadeyegowda M, Umesha C, and Veeranna HK
Abstract: Rigorous research efforts are being made by scientists around the world to evolve different strategies for improving paddy yield, among all agronomic practices weed management is the one which improve the crop growth and yield considerably. Studies for weed management in transplanted paddy were carried out at the experimental farm Agricultural and Horticulture Research Station, Ponnmapet, Virajpet taluk, Kodagu district of Karnataka during the Kharif seasons 2016 to find out the best suitable herbicide molecules for weed control in transplanted Paddy (Oryza sativa L.). The experiment was laid out in randomized complete block design and replicated thrice with a net plot size of 3.2 m X 2.6 m. Tunga (IET 13901) a prominent variety of Kodogu district was used as a experiment material. The seedlings were transplanted during second week of August. Three days after transplanting, butachlor, bensulfuron methyl + pretilachlor, Oxadiargyl at as pre emergence herbicide. Penoxsulum, bispyribac sodium, 2,4 D and ethoxysulfuron were sprayed as post emergent sprays at 20 days after transplanting, pre emergence followed by post emergent treatment also used in the experimental material to check the efficacy of the herbicide. Oxadiargyl at 3 DAT fb penoxsulum at 20 DAT and oxadiargyl @ 3 DAT fb bispyribac-Na at 20 DAT recorded higher weed control efficiency (92.79 to 77.91 % and 89.24 to 75.42 %, respectively) throughout the crop growth period. Whereas, highest (100.00 to 91.06 %) and lowest (0.00) weed control efficiency was recorded in hand weeding twice at 20 and 40 DAT and in unweeded control, respectively. The lower grain and straw yield was recorded with butachlor 5% G @ 30 kg a.i. ha-1 at 3 DAT (2836 and 4434 kg ha-1, respectively). However, unweeded control recorded significantly lower grain and straw yield (1821 and 2410 kg ha-1, respectively). Whereas, hand weeding twice at 20 and 40 DAT recorded significantly higher grain and straw yield (4300 and 5362 kg ha-1, respectively).
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How to cite this article:
Rajath HP, Jadeyegowda M, Umesha C,, Veeranna HK. Efficacy of herbicide molecules to control composite weed flora in transplanted Paddy for Kodagu region. Int J Chem Stud 2018;6(6):912-915.
