Effect of post emergence herbicides on weed control and wheat yield.
1994
Khan M. | Noor ul Haq
Present study was conducted to see the effect of some post emergence herbicides on weed control and wheat yield. The experiments were conducted at Agricultural Research Institute, Tarnab during 1988 and 1989. The chemicals used were chlortoluron + MCPA, methabenzthiazuron, isoproturon 75WP, isoproturon 50WP, isoproturon 75WP (a different product) and metoxuron 80WP (at the rate of 1.5, 1.4, 1.13, 1.0, 1.7 and 1.6 kg a.i./ha, respectively). All herbicide treatments effectively controlled weeds during both years except metoxuron. It was not effective against Poa annua during 1988. In both years, wheat yield increased significantly with herbicides application. The range in grain yield was between 2326 to 4326 and 2037 to 3750 kg per hectare in 1988 and 1989, respectively. Yields were 4326, 4257, 3750, 3924 and 3924 kg per hectare by the applications of chlortoluron + MCPA, methabenzthiazuron, isoproturon 75WP, isoproturon 50WP and metoxuron, respectively in 1988. Yields were 3772, 3853, 3437 and 3605 kg per hectare in 1989 from plots treated with chlortoluron + MCPA, methabenzthiazuron, isoproturon 75WP, isoproturon 50WP and metoxuron, respectively. Because chlortoluron + MCPA, methabenzthiazuron, and all isoproturons controlled weeds and increased wheat yield and are available in the market; therefore the commercial use of these herbicides is recommended in NWFP to control weed growth in wheat.
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