12 introduced alfalfa(Medicago sativa) breeds,including Alfaking,Fields,Pyramid,Reward,Simplot 2000,Norva,Hopeland,Multifoliator,Leafking,Pick 3006,Pick 8925,Spreador-3,from American and Canada compared with local breed(Zhonglan 1) were studied in breed introduction cultivation tests in semi-aridity areas(Lanzhou) in 2003,and on adaptability in semi-humidity area(Gangu) in 2008.The results indicated that 12 introduced alfalfa plants grew well and completed all the reproductive periodicity.The results did no...