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Recent investigations are focused on the characterization of hydroxyapatite nanoparticles obtained via addition or substitution processes with different cations or molecules. These nanoparticles can be used for developing fertilizers that can be applied in sustainable agriculture. Hydroxyapatite (HA) has multiple uses in agriculture: as a source of phosphorus, to obtain slow-release fertilizers as well as for removing and / or immobilizing heavy metals. Synthesised hydroxyapatite (HAE) gives the advantage of using...