Bacterial formation of struvite

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Abstract
The formation of exocellular precipitates of struvite (Mg NH4PO .cntdot. 6H2O) by 96 kinds of calcite-producing bacterial strains isolated from soil was studied. The influence of Ca ions on struvite precipitation was also studied. The number of strains producing struvite was 20. Only 4 consistently formed large amounts. The bacterial precipitation of struvite is not a general phenomenon. The strains studied were taxonomically identified and no relationship was found between the production or struvite and the taxonomic identity of such strains. Ca, supplied as Ca acetate in the culture medium, appeared to inhibit the biological precipitation of struvite.