معرفی زمان کاشت پاییزه ژنوتیپ های متحمل به سرمای کلزا (.Brassica napus L) برای اقلیم آذربایجان شرقی

The present research was done in order to determine the suitable fall planting date of oilseed rape in the East Azarbaijan climate (cold and semi-arid with freezing winters in Copen climate classification system),to evaluate of late planting effects on cold damage, seed and oil yields, yield components and to introduce cold tolerant genotypes. The experiment was conducted as split plotbased on RCBD design with two factorsincluding sowing date with ۳ levels (۱۱ and ۲۱ September and ۱ October) and ۱۴ fall oilseed rape genotype in three replications. The study was carried out in East Azarbaijan Agriculture and Natural ResourcesResearch and Education Center during two years (۲۰۱۴-۱۵ and ۲۰۱۵-۱۶). The results indicated that plants in the ۱۱ September planting date had significantly higher values of  pods per plant, seeds in  the pod, ۱۰۰۰ seeds weight, seed and oil yields. Late sowing datesdecreased seed and oil yields by decreasing yield components and increasing cold damage in oilseed rape genotypes.Therefore, ۱۱ September could be a suitable dateforthe cultivation fall genotypes of oilseed rape in East Azarbaijan and areas with similar climate.Correlations among the seed and oil yields with cold damage percent and yield components were significantly negative and positive respectively. It seems that yield decrease in late planting dates can occur via omiting plants from farm and decreasing yield components. L۵۵, HL۲۰۱۲, Wpn-۶, L۷۲, SW۱۰۲, HL۳۷۲۱genotypes indicated higher seed and oil yields in fall cultivations and are suitable for cultivation in East Azarbaijan.

کلیدواژه ها:

تنش سرما ، زمان کاشت ، درصد روغن ، عملکرد دانه ، کلزا