بررسی اثر تاریخ کاشت روی عملکرد دانه و روغن کلزا تحت شرایط دیم مناطق سرد

Rapeseed autumn planting may be exposed to cold damage and plants destroying in cold areas. Also, above areas possess long springs that it is very suitable rapeseed. Therefore, getting high seed yield varieties is very important for entezari and spring plantings in cold areas under rain fed conditions. This research conducted in tow years and eight areas. 5 date of sowing (November.22, December.6, February.20, March.6 and 16) in main plots and 3 genotypes Hyola401 (B.napus), Parkland (B.rapa), Select4 (B.juncea) in sub plots were compared at split plot in RCBD with three replications under rain fed conditions. Each plot had five rows 5-meter length and row to row distance was 30 cm. Observations were made on agronomy variables during crop growth and after harvesting. The results showed that February.20 and March.6 were the most suitable. Namely, the 20 days between February and March is the best date of sowing in cold areas. Of course, farm should been prepared in fall. Also, varieties had high seed yield which had low or medium phonology traits (No. of days to start and ending flowering and maturity). Therefore, earliness is a very important factor in increasing products under rain fed conditions. In general, Hyola401 and Select4 included economic yields and we can plant them in cold areas at the end of February until the beginning March under rain fed conditions.