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Pyrophosphate Hydrolysis of Ammonium, Calcium, and Calcium Ammonium Pyrophosphates in Selected Texas Soils
Author(s) -
Hossner L. R.,
Melton J. R.
Publication year - 1970
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1970.03615995003400050036x
Subject(s) - pyrophosphate , hydrolysis , chemistry , ammonium , soil water , solubility , calcium , inorganic chemistry , nuclear chemistry , calcium pyrophosphate , biochemistry , organic chemistry , geology , enzyme , soil science
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 CaCO 3 treatment. Except for Ca 2 P 2 O 7 , hydrolysis rate could not be predicted by the relative solubility of the pyrophosphate compound. For example, in the three acid soils, hydrolysis rates were: CaH 2 P 2 O 7 = Ca 3 (NH 4 ) 2 (P 2 O 7 ) 2 · 6H 2 O = (NH 4 ) 3 HP 2 O 7 · H 2 O >> Ca 2 P 2 O 7 . However, for the two basic soils, hydrolysis rates were: CaH 2 P 2 O 7 > Ca 3 (NH 4 ) 2 (P 2 O 7 ) 2 · 6H 2 O > (NH 4 ) 3 HP 2 O 7 · H 2 O > > Ca 2 P 2 O 7 . Pyrophosphates were hydrolyzed more rapidly in acid soils than in basic soils. Application of 2% CaCO 3 reduced hydrolysis rates of the acid soils. The same application of CaCO 3 to the basic soils either slightly increased or had little effect on the hydrolysis rates.