Comparison of Methods for Identifying Crystalline Phosphates Produced by Interaction of Orthophosphate Fertilizers with Soils

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Abstract
For identifying crystalline phosphates formed in soils treated with Ca(H2PO4)2·H2O, NH4H2PO4, and (NH4)2HPO4, various methods investigated ranked as follows in decreasing order of sensitivity: optical examination of soil ≥ optical examination of glass‐fiber filter paper inclusion > X‐ray diffraction examination of glass‐fiber filter paper inclusion > X‐ray diffraction examination of soil. Ca8H2(PO4)6·5H2O was identified in one soil but not in the paper inclusion. Differences were more frequent with calcite inclusions. Where there was a difference in phosphates identified between calcite inclusions and calcareous soil, the more acid phosphates seemed more stable in soil than on calcite inclusions, and the more basic phosphates seemed more stable on calcite inclusions than in soil.

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