germination response and estimation of seed deterioration of brassica napus under various storage conditions

canola is one of the most important crops in the world and ranked as the third most important oil seed crop. adverse environmental storage conditions including high temperature and relative humidity could affect canola seed quality. the aim of this study was to evaluate the seed quality of canola seed under various seed moisture content, temperature and storage time using okapi cultivar. also, electrical conductivity of seeds was measured. moreover, seed viability constants were estimated using germination responses. seeds with various moisture contents (5, 9, 13, 17%) were kept under five temperatures (5, 15, 25, 35, and 45°c) for six months. every month, seeds were taken and transferred to 20°c for viability test. germination test last for seven days. analysis of variance indicated significant differences for all interaction effects. according to the results, seeds with 5% moisture content stored at 5°c had the highest germination percentage and the least deteriorated state even after 6 months. high temperatures along with higher moisture content resulted in more deterioration. electrical conductivity increased under aforementioned conditions. estimates of ke = 5.65359, cw = 2.49975, ch = 0.04387, cq = 0.00001438 were derived for prediction of storage length