关键词: 紫花苜蓿, 秋眠性, 生产性能, 营养品质, 综合评价

Abstract: To investigate the differences in production performance and overwintering ability of alfalfa (Medicago sativa L.) at different fall dormancy levels. In this study,26 fall dormancy level alfalfa varieties from home and abroad were used as test materials to study growth characteristics,nutritional quality,overwintering traits,and their comprehensive evaluation of alfalfa. The results showed that the biomass per plant,plant height,stem diameter,and crude protein content of alfalfa tended to increase and then decrease,whereas the stem to leaf ratio,neutral detergent fiber,and acid detergent fiber content tended to initially decrease and subsequently increase with the increase of fall dormancy rate,and the overwintering rate gradually decreased as fall dormancy rate increased. The comprehensive evaluation scores of the principal component analysis ordered from high to low were fall dormancy level 4>level 3>level 2>level 5>level 6>level 8>level 7>level 9> level 10,and the cluster analysis showed that fall dormancy level 4 and level 3 alfalfa were the best class in terms of the overall index. Therefore,alfalfa with fall dormancy level 4 is the closest to the ideal variety,followed by fall dormancy level 3. Both of the above two fall dormancy levels of alfalfa are suitable for planting in Shihezi,Xinjiang.

Key words: Alfalfa, Fall dormancy, Production performance, Nutritional quality, Comprehensive evaluation