Effect of different levels of herbicides on weeds population and grain yield of wheat
1994
Hassan, S.W. | Khan, S. | Khan, M.A. | Rahmatullah (NWFP Agricultural Univ., Peshawar (Pakistan). Dept. of Agronomy)
The above captioned experiment was laid out in RCB design with split plot arrangement of treatments on a plot size of 2.5 x 3.5m; replicated three times during 1991-92. Wheat variety Pirsabak-85 at the rate of 100 kg/ha was seeded using two bags of diamominium phosphate (18:46) as a basal fertilizer. Four different levels depending upon efficacy of four herbicides, were applied as post emergence at proper soil moisture after first irrigation. The first, second and 3rd rates of all the herbicides were designated at minimum, optimum and maximum besides one control. Arelon at the rate of 0, 0.87, 1.75 and 2.0 kg/ha; Buctril-M at the rate of 0,0.6, 1.23 and 1.85 lit./ha DMA at the rate of 0, 1.23, 2.47 and 3.08 kg/ha and 2, 4-D at the rate of 0, 0.5, 1.0 and 1.2 kg/ha were sprayed at 3 to 4 leaf stage of wheat crop. Weeds count was made randomly in a 10 x 10 cm unit area after a month's time of seeding. Weeds population was significantly reduced at the rate of minimum levels of all herbicides while buctril-M and arelon at optimum and maximum level had completely wiped out weeds from the respective plots. The rest of the herbicides were statistically significant in controlling weeds at various levels. Arelon sprayed at the rate of minimum dose of 0.87 kg/ha resulted in highest grain yield of 3.568t/ha followed by Buctril-M with 3.294t/ha.
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