Evaluation of seed vigor of Canola using mean time to germination and accelerated aging test under storage condition

The seed quality evaluation 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 rapeseed varieties produced in Qom province- Iran. The studied cultivars were RGS, Talaieh and Okapi and the package types were three –layers paper bag ,4-layer paper bag , propylene bag ,propylene+paper and flaxen bag which was studied using factorial experiment on the basis of completely randomized block design at 3 replications. The seed containing bags were stored in the ware house of agricultural and natural resources center of Qom province for 1 year and the standard sampling of each treatment and replication was done at intervals of 3months, 6months, 9 months and one year. Then the germination ability of seeds was tested by standard germination test and mean time for germination and accelerated aging test have been conducted for estimating seed vigor. As the results showed the seed viability wasn’t affected until first stage of sampling(3 months storage) in a way that the germination percent at standard germination test and the vigor tests show that the storing packages have no effect on seed viability during these three months, but the decrease of germination ability at standard germination test was observed after 6 month storage (second sampling stage) and the seed germination ability had more decline within the storage time and this reduction was more evident in propylene and paper+propylene .Also the seed vigor tests indicate more decline of vigor in propylene and paper+propylene bags however the vigor decrease in 3-layers and 4-layers paper bag was less in away that the germination ability of seeds stored in 3-layers and 4-layers paper remained at standard level after one year storage .