Fatty Acid Composition of Canola Cultivars Affected by Different Sowing Dates

To investigate the effect of sowing date on yield and qualitative traits of canola cultivars and cope ‎with late-season drought stress, an experiment was carried out for two planting years in Karaj (Iran). ‎Sowing dates in six levels including three fall and three winter sowing dates were considered as the ‎main factor and five canola cultivars (RGS003, Dalgan, Zabol10, Hyola401 and Hyola4815) as the ‎sub-factors. The results showed that except for palmitic acid, the simple effect of sowing date on all ‎the studied traits was significant in winter. The simple effect of cultivar on all traits in fall was ‎significant and in winter, it was only significant on the seed yield and seed oil yield. The interaction ‎between sowing date and cultivar in fall is the reason of significant effect of seed oil yield, linoleic ‎acid, linolenic acid, erucic acid and glucosinolate and in winter, it is the reason for the significance of ‎seed yield, oil content, oil yield and erucic acid. Dalgan cultivar had the highest seed yield and oil ‎yield on sowing date of October 7, and had the highest levels of oleic, linoleic and palmitic fatty ‎acids. In addition, with low and standard erucic acid and glucosinolate, this cultivar is recommended ‎based on the results of this study.‎