Relationship between group distribution and agronomic traits in Clycine max

The relationship between group distribution and agronomic traits in Clycine max was studied to provide a theoretical basis for constructing a reasonable group distribution. The field experiment was carried out with C.max cultivar Hefeng45, Hongfeng11 by setting 6 different group distributions in 2009, LSD method was used to compare and analyze change of agronomic traits in the different group distribution, compensation effect of stem numbers in unit area was calculated, the change trend of yield and its relationships with agronomic traits and group distribution were studied, and agronomic traits were analyzed by principal component. The results showed that，1) Significant effect of group distribution was acquired for agronomic traits, effect of plant spacing significantly higher than that of row spacing, there were not difference of genotype.2) Change with compensation effect value of stem numbers in unit area by decreasing of plant spacing showed the quadratic parabola curve with increasing row spacing; the two group compensation effect by increasing row spacing were not consistent with increasing plant spacing; there was difference of genotype on the compensation effect.3) Group distribution had significant effect on yield, the group distribution which was found for the highest yield showed difference of varieties; there were significant positive correlation between plot yield with stem thickness and row spacing.4) Two principal components were obtained as growth traits factor and yield traits factor, growth traits factor had higher specificity in varieties, and effects of group distribution were different on the two factors.