Grey correlation analysis of main agronomic characters and its yield and quality traits in Sorghum sudanense

In order to exploring the relationship among the agronomic characters and yield and quality of Sorghum sudanense populations, three sudangrass populations were studied with the method of grey correlation degree analysis. The results showed that leaf length and stem diameter had significantly positive effect on hay yield of sudangrass, which is the major limitation factor of hay and fresh grass yield; sudangrass cultivar/lines with less tiller and node, but appropriate leaf length, width and stem diameter possesses relatively high quality; In sudangrass breeding process, according to specific breeding objectives for yield or quality, selecting these agronomic traits with stable performance and correlated relationship with high yield and quality, and understanding the primary and secondary relationship, will help provide theoretical base for new cultivar breeding.