Abstract: In this study, a total of 9 different forage varieties collected from domestic and foreign countries were planted in saline-alkali soils with single-sowing and two mixed sowing treatments. To select the suitable green manure varieties for cultivation in saline-alkali land, soil organic matter, total nitrogen, total phosphorus, total potassium, available nitrogen （alkali nitrogen）, available potassium and soil pH value were determined in two different period （booting stage and green manuring period） after planting. The results showed that different forages effectively increased the soil organic matter contents, and the groups of Avena sativa L. cv. Tianyan 2 + Pisum sativum L. cv. Caoyuan 224, Vicia villosa Roth. cv. Xinjiang, Pisum sativum L. cv. Dangdibai, and Vicia villosa Roth. cv. Savane were more effective, which were 4.76, 4.00, 3.44 and 3.14 times higher than that of the control group. In addition, different forages had different degrees of improvement in soil N, P and K, and Vicia sativa L. cv. Nacre, Pisum sativum L. cv. Caoyuan 224, Pisum sativum L. cv. Dangdihei and Pisum sativum L. cv. Dangdibai performed better, all of which were significantly higher than that of the control （P<0.05）group. The contents of available nitrogen and available potassium were increased after different green manure treatment, among which Vicia villosa Roth. cv. Xinjiang, Pisum sativum L. cv. Dangdibai and Vicia villosa Roth. cv. Savane performed better. Different forages had different effects on soil pH value after green manuring treatment, but the treatments of Vicia villosa Roth. cv. Savane, Vicia villosa Roth. cv. Xinjiang and Pisum sativum L. cv. Dangdibai showed significantly reduction （P<0.05）. In conclusion, Vicia villosa Roth. cv. Xinjiang, Pisum sativum L. cv. Dangdibai and Vicia villosa Roth. cv. Savane are more suitable as green manure crops grown on saline-alkali land.

Key words: forages；saline-alkali land；soil nutrients；green manure