Effect of planting date on yield and yield components of spring Rapeseed (Brassica napus) cultivars in Isfahan region

This experiment was done to evaluate the effect of planting date on agronomic characters of spring Rapeseed cultivars in Isfahan region during 2004-2005 in the research field of Islamic Azad University of Khoorasgan located in North East of Isfahan. The experiment was conducted as split plot on CRB with three replications. Four rapeseed cultivars consist of RGSOO3, PF7045-91, Option 500 and Hyola 401 as subplot and Four planting dates (Feb. 27th and Mar. 9, 19 and 28th) were selected as main plot. Traits were considered as plant height‚ number of sub branch per plant, number of sub and main pods per plant, number of grain per sub and main pods, 1000 seeds weight, grain yield and oil seed content. Results showed that the effect of planting date on all traits, except plant height, was significant. Also, effect of cultivars on all traits, except number of sub branch per plant was significant.The interaction effects of year, planting date and cultivar on the number of sub branch per plant, number of sub and main pods per plant and 1000 seeds weight were significant. According to biannual results RGS003 cultivar at the first planting date recommended for Isfahan region.