Samples of 19 seed lots from 19 farmers, which were cultivated in different areas of the Khorasan province, Iran were obtained and used in physiological germination tests before and after CD test. Seedling emergence percentages of the seed lots in the fields of all farmers were assessed 30 days after sowing using one square meter quadrat at different parts of each field randomly. The relationship between laboratory results (final germination, normal seedlings and MGT) before CD with field emergence was not significant. But, there was a significant correlation between final germination, normal seedlings and MGT after CD with field emergence (r = 0.57, 0.51 and 0.49, respectively). Early counts of physiological germination before CD, made 2 days after the beginning of the germination test, were related to emergence performance in the field (r = 0.47, p<0.05) as well as early counts of physiological germination 2 (r= 0.55, p< 0.01) and 3 days (r=0.48, p<0.05) after CD test. These results revealed that the early count of physiological germination is a convenient way to identify differences in vigour and predict field emergence of oilseed rape. This method, called RE test, is a rapid and simple method in comparison to the CD vigour test.

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