Communications in Plant Sciences, vol 7, issues 3-4, p.55-61, 2017 (2017009)
Authors: Megersa Kebede, Geleta Gerama, Tigist Bidira, and Chemeda Birhanu
Abstract: A field experiment was conducted to evaluate post-emergence herbicides for weed management and grain yield of wheat at Shambo and Gedo, Sub-station of Bako Agricultural Research center during summer season of 2014/2015. The experiment was laid out in randomized complete block design with three replications. The treatments consisted of four post-emergence herbicides; Pyroxsulam, Fenoxaprop-p-ethyl 6.9%, Clodinafop-propargyl and Pinoxaden 45 g L-1 + Cloquintocet Mexyl, and Hand weeding and weedy check were used for comparison. Results of the experiment depicted that Significantly lowest total weed population (11.33 m-2) and (11.00 m-2) and maximum grain yield of (3460.3 and 3254.0 kg ha-1) with (56.9 and 51.7%) increase in grain yield over weedy check was recorded in Plots treated with Pyroxsulam at the rate of 0.5 L ha-1 at Shambo and Gedo sites, respectively. Additionally, the lowest total weed dry weight of (5.8 and 5.2 g m-2) with highest herbicide control efficiency (75.9% and 77.3%) was recorded for Pyroxsulam followed by two times hand weeded plot at these respective locations. In contrary, the highest weed population (45.20 m-2) and (45.53 m-2) and lowest grain yield (1492.1 kg ha-1) and (1571.4 kg ha-1) was obtained from weedy check at Shambo and Gedo, respectively. Thus, from the result Pyroxsulam was recommended as effective and feasible post-emergence herbicide to control major grass and other weed species in a wheat field in study areas.
Post-emergence herbicides provided better weed efficacy and boosted grain yield. Among tested herbicides, Pyroxsulam provided significant control of weeds causing significant reduction in density of target weed flora and also significantly improved the grain yield in comparison with other herbicides and weedy check.
Keywords: Evaluation, Grain yield, Weed reduction, Weed species.