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Pyrophosphate Hydrolysis of Ammonium, Calcium, and Calcium Ammonium Pyrophosphates in Selected Texas Soils¹

ABSTRACT

Five soils of varying chemical and mineralogical composition were treated with several pyrophosphates, and the rate of pyrophosphate hydrolysis determined. Pyrophosphate hydrolysis was a function of the pyrophosphate compound, soil type, and CaCO₃ treatment.

Except for Ca₂P₂O₇, hydrolysis rate could not be predicted by the relative solubility of the pyrophosphate compound. For example, in the three acid soils, hydrolysis rates were: CaH₂P₂O₇ = Ca₃(NH₄)₂(P₂O₇)₂ · 6H₂O = (NH₄)₃HP₂O₇ · H₂O >> Ca₂P₂O₇. However, for the two basic soils, hydrolysis rates were: CaH₂P₂O₇ > Ca₃(NH₄)₂(P₂O₇)₂ · 6H₂O > (NH₄)₃ HP₂O₇ · H₂O > > Ca₂P₂O₇. Pyrophosphates were hydrolyzed more rapidly in acid soils than in basic soils.

Application of 2% CaCO₃ reduced hydrolysis rates of the acid soils. The same application of CaCO₃ to the basic soils either slightly increased or had little effect on the hydrolysis rates.

¹ Contribution from the Soil and Crop Sciences Dept., Texas A&M Univ., College Station, Tex. 77843. Presented before Div. S-2 Soil Sci. Soc. Amer., Nov.11, 1969 at Detroit, Mich.

² Associate Professor and Assistant Professor, Soil and Crop Sciences Department.

Received for publication February 23, 1970. Accepted for publication May 25, 1970.

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