Abstract
A field experiment was carried out to study the efficacy of different post-emergence herbicides for controlling weeds in
wheat during a Rabi season 2008-09. Experiment comprised of six treatments, i.e. weed-infested control, pyroxasulfone at 50
g a.i ha-1, metribuzin at 250 g a.i ha-1, isoproturon at 1080 g a.i ha-1, clodinafop propargyl at 240 g a.i ha-1 and
bromoxynil+MCPA at 247+247 g a.i ha-1 as post-emergence herbicides. Results revealed that Post-emergence application of
isoproturon (1080 g a.i ha-1) proved to be best for obtaining maximum grain plus straw yield up to the level of weed-free
control. Bromoxynil+MCPA (247+247 g a.i ha-1) and clodinafop propargyl (240 g a.i ha-1) also gave maximum spike bearing
tillers, number of grains spike-1 and 1000-grain weight. Isoproturon (1080 g a.i ha-1) strictly reduced the weeds population as
well as biomass as compared to weed-infested control. Poor weed control was achieved by using pyroxasulfone and
metribuzin treatments. Hence, post-emergence Isoproturon (1080 g a.i ha-1) followed by bromoxynil + MCPA (247+247 g a.i
ha-1) was provide to be the most effective herbicide against weeds and resulted in maximum wheat yield.
