Fig. 3

The interaction network diagrams of the dominant genera with relative abundance of Top50. A The interaction network diagram of dominant genera with relative abundance of Top50 in the microbial community without calcium. Phenylobacterium, Methylobacterium, Sphingomonas, Paenibacillus were the main core bacteria in the group. B The interaction network diagram of dominant genera with relative abundance of Top50 in the microbial community with calcium. Cupriavidus, Gemmatimonas, Bryobacter, Enterobacter were the main core bacteria in the group. C The interaction network diagram of dominant genera with relative abundance of Top50 in the microbial community at the seedling stage. Candidatus Solibacter and Herbaspirillum were the main core bacteria in the group. D The interaction network diagram of dominant genera with relative abundance of Top50 in the microbial community at the pod filling stage. Comamonas, Novosphingobium, Methylobacterium, Pseudomonas, and Flavisolibacter were the main core bacteria in the group