STUDY OF VARIOUS HERBICIDES FOR WEED CONTROL IN WHEAT UNDER IRRIGATED CONDITIONS

A field experiment was conducted at malakandher farm, nwfp agricultural university peshawar during the rabi season 2004- 2005. the experiment was laid out in randomized complete block (rcb) design with four replications. six treatments were kept in each replication with five post-emergence herbicides including topik 15 wp @ 0.04 kg, puma super 75 ew @ 0.75 kg, buctril super 60 ec @ 0.45 kg, isoproturon 50 wp @ 1.0 kg, aim 40 df @ 0.02 kg a.i. ha-1 and a weedy check. the parameters found significantly affected were weed control efficiency (%), fresh weed biomass (kg ha-1), number of tillers m-2, 1000-grain weight (g) and grain yield (kg ha-1). statistically maximum weed control efficiency (85.4 %) and minimum fresh weed biomass (1015 kg ha-1) was observed in plots treated with isoproturon 50 wp followed by buctril super 60 ec with values (77.3 %) and (1330 kg ha-1) respectively as compared to the fresh weed biomass (3175 kg ha-1) in the weedy check. similarly number of tillers (253 m-2), 1000-grain weight (38.9 g), biological yield (13500 kg ha-1) and grain yield (3250 kg ha-1) were maximum in isoproturon 50 wp treatments followed by buctril super 60 ec treatments with values (210 m-2), (34.8 g), (11420 kg ha-1) and (2883 kg ha-1) respectively as compared to the weedy check (136 m-2), (23.4 g), (9834 kg ha-1) and (1834) respectively. the herbicide isoproturon 50 wp @ 1.0 kg a.i. ha-1 followed by buctril super 60 ec @ 0.45 kg a.i. ha-1 both applied as post emergence in wheat performed well in the entire weed and crop data parameters and showed effectively weed control in wheat.