Abstract: "Effect of plant density to matter production characteristics were carried out by 4 soybean near-isogenic lines with different leaflet shapes(narrow and broad) under different plant density treatments(4.5×104,6.0×104,10.5×104,15.0×104,19.5×104,24.0×104,28.5×104 plants/ha density).The result showed that the effect of density to SPAD value of leaves was slight in soybean near-isogenic.On contrast,the effect of density to photosynthetic is significant higher.Pn of narrow leaflet shape group is higher in low density(4.5×104 and 6.0×104 plants/ha density)and high density(28.5×104 plants/ha density)than in normal density.Pn of broad leaflet shape group is higher in low density and normal density(6.0×104,10.5×104 and 15.0×104 plants/ha density) than in high density.Effect of plant density on biomss of different leaflet shapes were slight at earlier growing stage,the single plant biomass accumulation of narrow and broad group were decrease as planting density increasing at mid-later growing stages,but the biomass of narrow group were higher at the end.With the planting density increasing,seeds per plant of both groups were decreasing.Effect of plant density on seed pod number had no regulation,but the percentage of four seed pods of narrow group was significantly higher compared with broad group.Ranging from 15.0×104 plants/ha density to 28.5×104 plants/ha density of plant density,the yield of narrow group decreased as planting density increasing,and decrease by 9.5%,as well as 16.0% of broad group.all above,narrow group maintained high yield under the different planting density,perhaps it had powerful self-regulation and Ventilation condition was improved. "

Key words: Soybean, Plant density, Leaflet shape, Matter production characteristics

CLC Number: 

• S565.1