Evaluation of Post Emergence Herbicides for Control of Annual Weeds at Higher Seed Rate of Wheat

Abstract

Wheat is one of the most important food security crops that cultivated from small to large scale farms in Ethiopia. However, its productivity has been limited due to various abiotic and biotic factors including weeds. The aim of the study was to investigate the effects of post emergence herbicides application on weed management and productivity of wheat.  Four types of herbicides 2,4-D1lt ha^-1, Pyroxulam 0.5lt ha^-1, Florasulam 100ml ha^-1 and Florasulam+ Amirpyrolid 33gm ha^-1along with  control a weedy check were laid out in Randomized Completely Block Design with three replications. A total of identified 12 weed species were recorded 86 % broad and 14 % grass weeds. Relative weed density also indicated that the field was highly infested by Galinsoga pulviflora Cav. but the lowest infestation of Guizotia scabra(Vis) Chiov was recorded in the field. Results also revealed that significant effects of post emergence herbicides application for all the traits studied except number of seeds per spike. The minimum dry biomass weeds (88.33 kg ha^-1) and the highest weed control efficiency (78.60%) were recorded from the Pyroxulam. The highest number of productive tillers (133.33m^-2), stand count(414.33 m^-2),seeds per spike (76.48), thousand grain weight (42.60g), grain yield (4346.58 kgha^-1) and biological yield (12100kg ha^-1) were recorded from Pyroxulam while the lowest values were observed from the weedy check. Therefore, it can be concluded that Pyroxulam effectively managed weeds and gave maximum yield which could be recommended for the test environment. Since the experiment was conducted in one location and for single season, it should be repeated over seasons or multi locations for best recommendation.

Keywords: application, effect, herbicides, maximum, Pyroxulam

DOI: 10.7176/JEES/11-3-05

Publication date:March 31^st 2021