evaluation of agronomic traits and yield of wheat promising genotypes in zanjan region

to investigate the yield and agronomic traits of winter bread wheat genotypes in irrigating condition and also to determine the relationship of these traits with grain yield, 15 advanced genotypes of wheat along with three conventional cultivars where studied using randomized complete block design in three replications in 2010 growing season at kheyr-abad agricultural research station. the analysis of variance showed that there are significant differences between genotypes in thousand kernel weight, days to heading, harvest index, the number of grains in spike, grain yield, main spike length and seed weight in spike. there was significant and positive correlation among grain yield with plant height (r= 0.70) and the seed weight in spike (r =0.59) in irrigating condition, while there was negative and significant correlation between the grain yield and the number of fertile tillers (r2= -0.73). path analysis in irrigating condition showed that the harvest index, the number of spikes per m2 and days to heading had the greatest positive effect on the grain yield. on the whole, line number 4 (col no.3625//alamoot) have the most yield (7997 kg/ha) compared to other lines. this line was selected as the most productive at irrigating condition according to obtained results.