Productivity of transplanted rice as influenced by herbicide combinations

A field experiment was conducted during Kharif, 2013 and 2014, Collage of Agriculture, Rajendranagar, Hyderabad in Telangana state. Fourteen weed management practices were evaluated in a randomized complete block design, replicated thrice. Significantly higher grain yield (6.9 t/ha) was obtained with either hand weeding twice at 25 and 45 DAT or pyrazosulfuron-ethyl 20 g/ha at 3 DAT followed by manual weeding at 25 DAT (6.8 t/ha) or pretilachlor 750 g/ha as pre-emergence (PE) at 3 DAT followed by metsulfuron-methyl + chlorimuron-ethyl 4 g/ha as post-emergence (PoE) at 25 DAT (6.6 t/ha) or bispyribac-sodium 20 g/ha + metsulfuron-methyl + chlorimuron-ethyl 4 g/ha as PoE at 25 DAT (6.3 t/ha). However, significantly higher net returns (‘/ha) and B:C ratio were recorded with pyrazosulfuron-ethyl 20 g/ha at 3 DAT followed by manual weeding at 25 DAT of (‘ 69788, B:C 2.79), pretilachlor 750 g/ha as PE at 3 DAT followed by metsulfuron-methyl + chlorimuron-ethyl 4 g/ha as PoE at 25 DAT (‘ 67646, B:C 2.77), hand weeding twice at 25 and 45 DAT (‘ 68720, B:C 2.68), and bispyribac-sodium 20 g/ha + metsulfuron-methyl + chlorimuron-ethyl 4 g/ha as PoE at 25 DAT (‘ 62299, B:C 2.58).