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Chinese Agricultural Science Bulletin ›› 2015, Vol. 31 ›› Issue (2): 80-84.doi: 10.11924/j.issn.1000-6850.2014-1545

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Use of GRA for Comprehensive Evaluation of Alfalfa Cultivars in the “Three Rivers” Region of Tibet

Yang Xiao1, Li Jinhua1, Zhu Xinqiang1, Yu Chengqun2   

  1. (1Lanzhou Institute of Husbandry and Pharmaceutical Sciences of CAAS, Lanzhou 730050;2 Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101)
  • Received:2014-05-30 Revised:2014-05-30 Accepted:2014-08-18 Online:2015-03-19 Published:2015-03-19

Abstract: In order to meet the planting requirements of leguminous forage in the “Three Rivers” region of Tibet,the grey relevancy analysis(GRA) method is used in systematic evaluation, in which the distribution of all variables is analyzed by calculating the grey relational degrees. In this study, the productivity performances of 20 alfalfa cultivars in the “Three Rivers” region of Tibet were evaluated, using indexes including plant total height, stem-leaf ratio, fresh-dry ratio, wintering rates and fresh yield, a comprehensive cultivar evaluation model was established. The results indicated that cultivars including ‘Resis’, ‘Alfaking’, ‘Zhonglan No.1’, ‘Derby’ and ‘Sitel’ have relatively good productive performance, while ‘Algonquin’, ‘Deputes’, ‘Alfalfaqueen’ and ‘Beaver’ have relatively low adaptability. The order of 5 indexes in the grey relevancy analysis for weight was: stem-leaf?ratio>plant total height>fresh-dry?ratio>wintering rates>fresh yield.