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Field experiment was conducted at three locations i.e. Adaptive Research Farm and two at farmers field during Rabi 2014-15 under ecological zone of Adaptive Research Farm Sheikhupura to study the efficacy of different post emergent herbicides against narrow leave weeds. The experiment was carried out in randomized complete block design (RCBD) with three repeats. Present study comprised of five treatments including control. The treatments comprised of Axial (penoxadin), Exit (clodinofop propargyl), Brake (fenoxaprop-p-ethyl), Proton (Isoproturon) and weedy check. The data were recorded on Plant height at maturity (cm), no. of grains per spike, spike length (cm), weed density m-2, 1000 grains weight (g), and grain yield (t ha-1). All treatments of herbicide significantly control the weeds causing significant reduction in weed mass and also improved the grain yield significantly in comparison with the check at three locations. Highest death of weeds (96.12, 97.09 and 98.95 %) and with maximum grain yield of 2846.7, 3320.0 and 3300.0 kg ha-1 which is 19.6, 39.6 and 39.9 % higher than weedy check were recorded in the penoxadin treated plot at three locations respectively. In the weedy check the weed density was 51, 126 and 127 weeds m-2 with grain yield 2380, 2376 and 2358 kg ha-1 at three locations respectively.
Keywords: Wheat; Wheat weed density; Yield; Yield components; Herbicides