Effect of difference packages on seed vigor of rapeseed stored in Firoozkoh

Quality evaluation of seed which is considered as a crop propagation organ and the most important input for crop production، has a special position in seed production and certification. This experiment was conducted to study the effect of different packages on oil rapeseed varieties. The studied cultivars were RGS، Talaieh and Okapi and packaging cover types were three –layer paper bag، 4-layer paper bag، propylene bag،propylene+paper and flaxen bag which was studied using factorial experiment on the basis of randomized complete block design in 3 replications. The seed containing bags were stored in Ran corporation in Firoozkoh for 1 year and standard sampling of each treatment and replication was done at the end of the storage period then seeds germination was tested. Also electrical conductivity test، average time for germination cold test and accelerated aging test have been conducted for estimating seed vigor. The results showed significant difference between cultivars in cold test and Talaei was the best، but seeds storage in the various bags had a significant effect on seed vigor as seeds in four layer and three layer paper bags had the most vigor and seeds in propylene bags and paper propylene bag had the least vigour. Also the results showed that various seed storing covers have significant effect on the average time of seeds germination، electrical conductivity and vigor after cold test and accelerated aging test and in all cases three and four layer paper bags showed the best resulting. However propylene and paper propylene bags had more deteriorating effect on seed quality. Since in the warehouse the temperature had increased up to 35°c and air relative humidity up to 75% in some months of the year، and with considering that high temperature may accelerate the incidence of some metabolic reactions and either seed deterioration، so the temperature and relative humidity have more effect on propylene and propylene paper bags.