Alfalfa(Medicago sativa) has a long cultivation history in China.Up to now,its extension is still slow,although it has been sparkplugged for a long period of time.One of the important reasons is lacking a full understand about its adaptation to stress environment.In this paper,alfalfa s productivity,water consumption rule and adaptation to arid conditions in semi-arid and semi-humid regions were discussed.The paper points out that its characteristics of high water consumption and the low water efficiency ma...
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