Abstract: [Objective] This study was conducted to screen the high-yield and good-quality annual forage grass varieties suitable for planting and promoting in the Mu Us Sandy Land. [Method] A total of 12 forage grass varieties such as Juncao, forage sweet sorghum and forage maize were used as experimental materials, and their phenophase, agronomic traits and nutritional qualities were observed and measured. The adaptability of the varieties was comprehensively evaluated through variance analysis, correlation analysis and membership function. [Result] All of the 12 tested varieties exhibited adaptability to the local growth environment, completed vegetative growth phase and harvested forage grass. The fresh yield of Giant Juncao （Cenchrus fungigraminus） was the highest, followed by the forage sweet sorghum cultivar Lyujuren. The performance of the tested varieties in the hay yield was similar to that in the fresh yield. Giant Juncao had the highest crude protein yield, followed by the Juncao cultivar Lyuzhou No.1. Among the primary traits of the 12 introduced forage grass varieties, the plant height was extremely significantly （P<0.01） positively correlated with the fresh and hay yields, and the plant height and hay yield were significantly （P<0.05） negatively correlated with the crude protein content and relative feed value. The varieties with top three scores in membership function analysis from high to low were Giant Juncao, annual Melilotus officinalis, and Sorghum Hybrid Sudangrass cultivar Julang. [Conclusion] Comprehensive evaluation and analysis demonstrated that among the 12 tested forage grass varieties, the adaptability of Giant Juncao, annual Melilotus officinalis and Sorghum Hybrid Sudangrass cultivar Julang was better. The research results provided references for introducing suitable forage grass varieties in the Mu Us Sandy Land.

Key words: forage grass, introduction and evaluation, agronomic trait, membership function, adaptability