A field experiment was conducted during kharif- 2018 at the Agricultural Research Station, Gangavathi, University
ofAgricultural Sciences, Raichur, Karnataka, to study the efficacy of post emergence (PE) herbicide against weed complex
in transplanted rice. The experiment was laid out in a Randomized Block Design with three replications. The results
revealed that the total weed population and weed biomass including grasses, sedges and broad leaved weeds were maximum
under weedy check plots receiving no weed control (154.0 and 26.79 g/0.25 m2, respectively) as compared to plot receiving
hand weeding twice at 15 and 45 days after transplanting (DAT) (4.89 and 0.83 g/0.25 m2, respectively) and pendimethalin
38.7 % CS @ 680 g a.i./ha as PE followed by bispyribac sodium 10 % SC @ 25 g a.i./ha recorded minimum weed population
(22.67 and 3.81 g/0.25 m2, respectively) as well as dry biomass of weeds. Among the herbicides, the minimum value of
weed index (7.81 %) and maximum weed control efficiency (85.78 %) were recorded under pendimethalin 38.7 % CS @ 680
g a.i./ha as PE followed by bispyribac sodium 10 % SC @ 25 g a.i./ha. Un-weeded control recorded significantly higher
removal of NPK by weeds (11.13, 3.24 and 3.51 kg ha-1, respectively) as compared to hand weeding at 15 and 45 DAT
(0.45, 0.11 and 0.15 kg ha-1, respectively).