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The effect of different extraction phases of root exudates on the phosphate-solubilizing ability of B. frigoritolerans (A) and the nitrogen-fixation of B. megaterium (B) and their densities (C). Different lowercase letters above the data bar indicate that the strain with different extracts treatments has significant differences at the P < 0.05 level. The “*”indicated that density of the Bacillus strains multiplied by 106.
