Adaptability Evaluation of Introduced Alfalfas in the Arid and Semi-humid Area

Alfaking,Pick 3006,Pick 8925 and Spreador-3 were introduced from America and Canada,using Zhonglan No.1 as the regional control After completed district tests in the arid and semi-arid areas in 2002-2004,adaptability evaluation were conducted in the semi-humid area in 2008 and 2009.The result indicated that,five introduced alfalfa could grow normally in the semi-humid area and completed all the procreation periodicity,without exceptional representation and diseases and pests.We analyzed procreation periodicity,nutrition component,growth rapidity and ratio of stem and leaf.It also shown that the highest content of dissociative proline and soluble sugar was Alfaking,the lowest content of malondialdehyde also was Alfaking and the fresh yield of Alfaking was 125 642.8 kg/hm2 in the semi-aridity areas.Spreador-3nd Zhonglan No.1 were the choiceness varieties.The study advised that those five alfalfas can cultivate in the semi-arid and semi-humid areas in Loess plateau.