Abstract
THE bulk of the phosphate added to soils as fertilizer remains in forms unavailable to plants. In calcareous soils it has been said to form hydroxyapatite. From a study of the reversion of mixtures of superphosphate and liming materials, MacIntire and his associates1 have recently suggested that the ultimate form of some of the phosphate applied to heavily limed soils may be fluorapatite; but, so far as we have been able to ascertain, no direct evidence has ever been obtained of the actual presence in the soil of apatite formed from fertilizers.
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References
MacIntire, W. H., and Hatcher, B. W., Soil Science, 53, 43 (1942).
Hall, A. D., and Miller, N. H. J., Proc. Roy. Soc., B, 77, 1 (1905).
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NAGELSCHMIDT, G., NIXON, H. Formation of Apatite from Superphosphate in the Soil. Nature 154, 428–429 (1944). https://doi.org/10.1038/154428b0
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DOI: https://doi.org/10.1038/154428b0
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