Application of Grey Relational Analysis in Evaluating Major Attributes in National Variety Trial of Flue-cured Tobacco

The grey relational analysis was applied to evaluate the main characters such as main agronomic traits, the economic characters, chemical composition and the diseases resistance of the test varieties of 2008’s national flue-cured tobacco variety regional test in the northern. The results indicated that grey relational analysis was suitable for the comprehensive evaluation of flue-cured tobacco varieties, and it was systematic, simple and easy to operate. Compared with equal relational grade analysis, the weighted grade analysis was more close to the actual evaluation. It showed that weight was important to evaluate test varieties in grey relational analysis.