Abstract: To overcome the difficulty of soybean's production in Shanxi Province,the relationship between main agronomic characters and yield of 18 new soybean varieties with different ecological types was studied,so as to provide theoretical basis for breeding for high yield and super high yield.The cluster analysis was used to classify the ecological types.The principal component analysis and correlation were used to evaluate the agronomic characters.The results showed that the 18 varieties were divided into 4 categories with cluster analysis in the Euclidean distance at OD=5.54:The first kind was the multi-branch pods type; The second was the middle branch pod type; The third was the lanceolate leaves less branching pod type; The fourth was oval leaves less branching pod type. The yield of soybean germplasm of different ecological types was significant positively correlated with branch number and three pods number, and highly significant positively correlated with plant weight, two pods number, pod weight, grain weight, stem weight, total pods and total number of grains. The yield of soybean germplasm with different branch types varied with the density, and the highest yield reached different points. The yield of multi-branch type increased-decreased-increased with the increase of density, and reached the highest point when the density was 240 000 plants/ha. The yield of medium branch type showed a trend of ascending-descending-ascending-descending with the increase of density, and reached two peaks at the density of 120 000, 210 000 plants/ha, and reached the highest point at 120 000 plants/ha. The yield of small branch type of conifer and elliptical leaf showed a descending-ascending-descending change with the increase of density, the highest point was reached when the density of elliptical leaf type was 150 000 plants/ha, and the highest point was reached when the density of conifer leaf type was 180 000 plants/ha. High-yield and super-high-yield soybean breeding should pay attention to the application of multi-pod materials and reasonable density of soybean materials of different ecological types.

Key words: Soybean, Yield, Ecological type, Cluster analysis, Correlation analysis

CLC Number: 

• S565.01