*5.2.4 Phosphorus-solubilizing bacteria*

Strains of bacteria belonging to the genera of *Pseudomonas, Rhizobium, Agrobacterium, Flavobacterium, Bacillus, Burkholderia, Aerobacter, Achromobacter, Erwinia* and *Micrococcus* have been found to have the ability to solubilize insoluble inorganic phosphate compounds such as rock phosphate, dicalcium phosphate, tricalcium phosphate and hydroxyl apatite [149, 150]. Tricalcium phosphate and hydroxyl apatite have been reported to be more degradable substrates than rock phosphate while the most powerful phosphate solibilizers are strains belonging to the genera *Pseudomonas, Bacillus* and *Rhizobium* [151].
