| Dynamic growing process, stem-leaf ratio, fresh-dry ratio, regrowth characteristics, community characteristics, yield characteristics and physiological ecological characteristics of different alfalfa varieties have been studied, and growing characteristics of thirty-one alfalfa varieties has been evaluated comprehensively in this paper.It is concluded that:l.The reviving stage of varieties with high fall dormancy scale is earlier than that of varieties with low fall dormancy scale.2.As far as the dynamic of plant height is concerned, Beijiang and Aggressor are the most suitable for the environment of location area. Xinmu, Baofeng and Innovator are poorly suitable for the environment of location area..3.As for the accumulation of biomass and adaptiveness of environment, the adaptiveness of Ameristand, Beijiang , Runner, Ameriguard, Lobo,13r is better. However, that of Columbo, Rowdy, Jacklin, Dll and Deguodaye is poor.4.The dynamic of AGR and RGR shows a monopeak curve in whole developing stage of different alfalfa varieties. The AGR and RGR will reach the maximum from late of ramification stage to budding stage. The ecological adaptiveness of Beijiang, Zhongmu Aggressor is strong, however, that of 13r,Rowdy,Columbo is weak. Beijiang ,Vector and Deguodaye have higher product efficiency. The product efficiency of Rowdy , Columbo and 13r is lower.5.With the stem-leaf ratio increasing in different growing stage, the quality of alfalfa will decrease. The dynamic process of fresh-dry ratio of alfalfa shows reversing "S" curve. It has closely correlated to the accumulation of biomass.6.Plant height, ramification number, stem diameter and leaf area have significantly positive correlation to accumulation of biomass.7Archer, Haygraze, Alfagraze and Dll have better plant-type formation and great potentiality of high production and good quality. Baofeng, Amerigraze, Runner and Gs88-rn have poor plant-type formation ,moreover, poor plant-type formation result in reduction of quality.8.Different alfalfa varieties have different productive structure. The productive structure of Baofeng .Ameristand, Abilence, Xinjiandaye is reasonable.However, that of Jacklin, Avalanche, Deguodaye, Vector is unreasonable.9.There exists significant yield difference among different varieties. Beijiang, Amerigraze and Affinity have better economic character and higher yearly yield. Innovator, Ameriguard and Runner have worse economic character and lower yearly yield. The yield of Columbo, Ameriguard and Dll is more stable. While that of Zhonglan, Lobo and Amerigraze is more unstable.10.With the increasing of cutting times, the regrowth rate is decreasing. There exists significant difference of regrowth character among different alfalfa varieties. The regrowth character of Deguodaye , Beijiang and 13r is strong, and that of Jacklin, Baofeng, Gs88-rn is weak.11.The transpiration of alfalfa is increasing during the whole developing stage. Waterstress has less effect on Innovator, Arriba and Affinity, and has larger effect on Xinjiangdaye, Aggressor, Apollo supreme and Dll. Varieties with higher WUE are Vector, Total and Haygraze. Varieties with lower WUE are Ameristand, Avalanche, Runner and Zhongmu. Assimilation of ability of Innovator, Total, Affinity, Beijiang and Archer is strong, however, that of Ameristand, Runner,Avalanche and Deguodaye is weak. Stepwise regression analysis indicates that photosynthesis rate has significant correlation to transpiration rate, stomatal conductance, WUE, the difference of relative humidity and CO2 concentration between leaf and ambient air.12.Thirty-one alfalfa varieties have been evaluated, with the regrowth rate, stomatal conductance, WUE, photosynthesis, leaf-stem ratio, fresh-dry ratio, plant height, yield, the maximum accumulating potentiality of biomass, the most quickly accumulating time of biomass, and the maximum accumulating rate of biomass as evaluation criterions, by means of catastrophe evaluation. It is concluded that, varieties, with better comprehen...
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