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Nine winter oilseed rape mutant lines along with Okapi, Nima and Hamadi as check variety and 4 local varieties (Zarfam, Talaye, and Express were evaluated in Qazvin, Hamadan, Karaj, Isfahan, Zarghan, and Eslam Abad, in 2017-2019 cropping seasons using randomized complete block design with three replications. Based on the results of the six sites of experiment, at first year cultivars Talaye, Nima, Z-900-6, T-1200-1 and Okapi with 3527, 3501, 3327, 3304 and 3292 Kg/ha had higher seed yields and at the second year cultivars Nima, Z-900-9, Talaye, Z-900-8 and Z-800-6 with 3295, 3285, 3200, 3147 and 3064 Kg/ha seed yield and at average both years Nima, Talaye, Z-900-9, Z-900-8 and Z-900-6 with 3398, 3364, 3243, 3208 and 3190 Kg/ha had higher seed yields and were superior than others. Okapi as check variety occuipied the 8th position with 3059 Kg/ha seed yield. Mutant lines including Z-966-6T Z-900-8, Z-900-9 and T-1200-1 with lower number of days to ripening were the high-yielding early genotypes and had no difference with Zarfam an early cultivar.Key words: yield comparison, winter rapeseed, Mutant lines
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