Effect of plant growth regulator Cycocel and different levels of nitrogen fertilizer on some growth characteristics and yield of barley

The Effect of plant growth regulator Cycocel and different levels of nitrogen fertilizer on some growth characteristics and yield of barley, factorial experiment was conducted based on randomized complete block design with four replications in Research Station of the faculty of Agriculture, Islamic Azad University Branch Ardabil in 2015. Treatments the experiment consisted CCC concentration (zero, 500, 1,000 and 1,500 mg per hectar) and three levels of nitrogen (50, 100 and 150 kg per hectar) was applied in the form of urea on Makuyi spring barley cultivars.The results of this study showed that the concentrations of various nitrogen and cycocel on the number of fertile tillers, spike length and harvest index at 5% and the number of spikes per square meter, number of seeds per plant, grain weight, height plant, seed yield and biological yield were significant at the 1% level. The interaction of different concentrations of nitrogen and cycocel on the number of spikes per square meter, grain yield and biological yield was significant at 1%. In this experiment results mean comparisons showed that the highest number of fertile tillers (1/5), spike length (9/6cm), grain yield (3687kg/ha) and thousand grain weight (34/7 gr) respectively, application CCC (1500 mg/ha). The results of interaction between nitrogen fertilizer and different concentrations of cycele showed that the highest number of fertile tillers (1.8), number of spikes per square meter (383.5), grain yield (3808 kg/ha) and biological yield (3808 kg /ha) (17795/2 kg/ha) using 150 kg of nitrogen per hectare with 1500 mg/ha cycocel was obtained.