The effect of application time of axial herbicide on the yield of different cultivars of wheat for the control of wild oat (Avena fatua)

Abstract A split plot experiment was carried out as a randomized complete block design with three replications. The main treatment included three cultivars of the wheat (Chamran Dez Star) and the sub treatment included three application times of herbicide (early tillering mid tillering late tillering) and the control with and without weeding. The results showed that the effect of cultivar on the wheat yield components was significant at 1% level and its effect on the plant height number of grains per spike grain yield and number of wild oats was significant at 5% level. The effect of application time on the wheat yield and its components and weeds characteristic was significant at 1% level and the interactive effect of cultivar and application time on the grain yield 1000-grain weight number of spikes per square meter number of grains per spike number of spikelet harvest index number weight and height of wild oats was significant at 1% level. The highest number of grains per spike and the highest number of spikes per square meter belonged to Chamran cultivar and the best application time of herbicide was in the early tillering. According to the results the highest grain yield by 5550 kg/ha belonged to the treatment with Chamran cultivar in the early tillering. Therefore the best cultivar is Chamran cultivar and the best herbicide application time is in the early tillering.