For the FePO4 experiment, we selected two bacterial strains, PG12 (siderophore-producing ARB) and mutant PchA impaired in siderophore-production. The control was selected so that we can see the effect of siderophore in the bacterial spent media. For the phytate experiment, we selected two bacterial strains, PG6 (highest phytate solubilization among 7 ARB) and control strain P. chlororaphis (low phytate solubilization). Tomato plants acclimated in 0.2× HNS with low P and 0.2 mg L−1 Fe received 20 mL of spent medium from PG12 or PchA mutant and 0.2 g of phytate. The tomato plants acclimated in 0.2× HNS with low P and no Fe received 20 mL of spent medium from PG6 or PC and 0.2 g of FePO4. The plants were then grown for 1 week with 3 replicates.