Abstract:

Deqin and Algonguin alfalfa varieties were collected and compared in this study. The results showed that the cultivated day of Deqin alfalfa ranged from 233～246 days. Planted in 3 test places, the average winter suvival rate of Deqin alfalfa was 95.3%, which was singnificantly different from that of Algonguin（77.4%）(P<0.5). The average plant height of Deqin and Algonguin alfalfa were 38.2cm and 27.1cm respectively, the difference between those was especially singnificant(P<0.1). The value of Stem wt to Leaf wt of Deqin alfalfa was lower than that of Algonguin in 2004 (P<0.5), moreover, its values in 2005 and 2006 were obviously lower than those of latter (P<0.1). The yield results indicated that the fresh yields and dry matter yields of Deqin alfalfa were singnificantly higher than those of Algonguin (P<0.1). Dry matter contents of Deqin alfalfa in early flowering stage and full flowering state were 25.73% and 28.04% respectively, crude protein contents were 24.50% and 19.41% respectively, and IVDMD were 68.03% and 66.56% respectively, which all indicated the nutrition component of Deqin alfalfa was the fist level. The analysis of stress resistance showed that Deqin alfalfa had a strong resistance to high temperature and humidity, nutrient-deficient soil. Considering form the introduction point of view, Deqin alfalfa with a stong adaptability, high yield, good nutrition and palatability, was a kind of excellent forage variety which was worth planting and popularizing in DiqingTibetan Autonomous Prefecture.