To evaluate the effect of seedling age and cycocel consumption (CCC) on grain yield of cultivars Tarom Hashemi, the experiment in split plot in the form of complete randomized blocks with four replications was conducted at Islamic Azad University research farm in 2009 year. Three main levels of seedling age of Hashemi Tarom variety (20, 30 and 40 days) and the sub plot with three levels of cycocel (0, 1.2, 2.4 liters.ha-1) were considered. Results showed that with increasing seedling age, yield ratio decreased approximately 33 %. The maximum grain yield for seedling age of 20 and 30 days (respectively of 299.2 and 341.8 g.m2). Cycocel consumption on traits such as cluster number in square meter, total number of tillers in herb and number of effective tiller in herb showed significant difference. The highest resistance to ffracture under effect of CCC 2.4 liter.ha (25.52 g/stem) and the lowest affect Under control CCC(18.35 g/stem) was observed so that the maximum grain yield for seedling age of 20 and30 days (respectively of 299.2 and 341.8 g.m2)
