Document Type : Research Paper



In order to study the effects of sowing dates on yield, yield components and oil content of spring safflower, as double crop, an experiment was carried out in 2007 at the research field of agricultural college of Yasouj University. The experimental design was a factorial with randomized complete block with three replications. Four sowing dates (May 16, June1, June 16 and July 2) as a first factor and four cultivars (Arak 2811, Esfahan 14, IL111 and PI) as second factors were used. The results showed that May 16 and June 16 sowing dates had Minimum (1129 kgha-1) and Maximum (1372 kgha-1) seed yield respectively. Significant interactions were observed between cultivars and sowing dates for most of measured characters. Cultivars of Esfahan 14 at July 2 sowing date and IL111 at May 16 sowing date showed the highest and the lowest seed yield, oil yield, seed numbers per plant and seed numbers per head, respectively. Generally, with respect to these results it might be suggested that the Esfahan 14 cultivar at July 2 sowing date was the best option for double cropping of spring safflower in Yasouj region. However, because of the coinciding the harvest date of Esfahan 14, at July 2 sowing date, with the sowing date of some winter crops, such as canola, the June 16 sowing date for all cultivars is suggested as the second option.