Phosphate-solubilizing bacteria are often considered functionally redundant when releasing similar amounts of soluble phosphorus. Multi-omics analyses of Bacillus velezensis and B. licheniformis grown on sulfur-enriched bone char show otherwise. Despite comparable phosphate mobilization, both strains employ distinct regulatory and redox strategies. Phosphate solubilization therefore reflects integrated multi-nutrient metabolic reprogramming rather than a single trait response.