Author(s): H.M.JAYADEVA

Abstract: A field investigation was carried out during summer 2008, kharif 2008 and kharif 2009 in red loamy soil at Agricultural Research Station, Kathalagere, Channagiri taluk. Davangere district coming under the southern transitional zone of Karnataka. The present investigation was taken up to know the bioefficacy of Azimsulfaron 50 DF alone and Butachlor 50 EC (Standard check) in comparison with hand weeding on weeds control, crop safety and grain yield of transplanted rice. The field experiment was laid out in Randomized Complete Block Design with I 0 treatments viz., T1: Azimsulfaron 50 DF@ 27.5 g a.i ha\"1 + 0.2% Surfactant, T1: Azimsulfaron 50 DF@ 30.0 g a.i ha-1 + 0.2% Surfactant, T3: Azimsulfaron 50 DF@ 35.0 g a.i ha·\' + 0.2% Surfactant, T4: T2 + I hand weeding@ 40 DAT, T5: Pyrazosulfaron JO WP 25 g a.i ha·\' (3 DA1), T6: 2,4-DEE 2.0 kg a.i ha·\' (4 Weeks after transplanting), T7: Butachlor 50 EC@ 1.25 kg a.i ha-1 (standard check), T8: Butachlor 50 EC 0.9 kg a.i ha·\' + Almix@ 2.0 g ha-1, T9: Hand weeding twice (20 and 40 DAT) and T10: Weedy check These treatments were replicated thrice. Application Azimsulfaron 30.0 g a.i ha-1 (19 DAT) + 0.2 % surfactant followed by one hand weeding at 40 DAT recorded significantly higher grain yield (6834, 6683 and 6102 kg ha·\' in summer 2008, kharif 2008 and kharif 2009, respectively) and straw yield (7008, 7030 and 6494 kg ha-1 in summer 2008, kharif 2008 and kharif 2009, respectively). This treatment recorded significantly lower total weed density (0.00, 2.68 and 6.68 m-2 ) in summer 2008, kharif 2008 and kharif 2009, respectively) and total weed dry weight (0.00, 0.08 and 1.04 g m-2 in summer 2008, kharif2008 and kharif2009, respectively).

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