Study on the planting technique of mixed grassland in alpine pasture area

Abstract: In order to study the planting technique of mixed grassland, a series trials of combinations of different grass species (legume and gramaneae) at Sangke town, Xiahe County were conducted during 2004－2006. Results from the study showed that in the first planting year (2004), yield of hay and fresh grass of the combination Ⅱ (the mixture of Onobrychis viciaefolia cv.Gansu, Medicago sativa cv. Algonguin, Elymus nutans and Bromus inermis) was the highest, and significant (P0.05) higher than those from combination Ⅰ (the mixture of O.viciaefolia cv.Gansu, M. sativa cv.Algonguin and E. nutans), Ⅲ (the mixture of O. viciaefolia cv.Gansu, M.sativa cv. Algonguin and B. inermis) and Ⅳ (the mixture of O. viciaefolia cv.Gansu and M. sativa cv. Algonguin)； and the hay yield was higher by 379, 446 and 369 kg/ha, respectively. However, in the second planting year (2005) the yields of combinationⅠ, Ⅱ, Ⅲ and Ⅳ were 2 489, 2 857, 2 715 and 2 977 kg/ha, respectively. There were no significant differences between the combination Ⅰ and Ⅲ； between combination Ⅱ and Ⅳ. In the third planting year (2006), the yield of hay and fresh grass of combination Ⅳ was the highest and significant (P0.05) higher than that of combination Ⅰ by 3 635 kg/ha. There were significant differences among the four combinations.