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Decay of Phosphate Fertilizer Reaction Products in an Acid Soil
Author(s) -
Taylor A. W.,
Gurney E. L.,
Lehr J. R.
Publication year - 1963
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/sssaj1963.03615995002700020017x
Subject(s) - phosphate , ferric , chemistry , dissolution , potassium , incubation , iron phosphate , environmental chemistry , calcium , inorganic chemistry , nuclear chemistry , biochemistry , organic chemistry
Complex iron and aluminum phosphates that may be formed by the reaction of concentrated acidic phosphate solutions with soil minerals were incubated in a moist acid soil for 10 months. Potassium ferric phosphate, H 8 KFe 3 (PO 4 ) 6 ·6H 2 O, and calcium ferric phosphate, H 4 CaFe 2 (PO 4 ) 4 ·5H 2 O, dissolved incongruently with release of part of their phosphate to the soil and formation of strengitic residues. Potassium taranakite, H 6 K 3 Al 5 (PO 4 ) 8 ·18H 2 O, was more stable; it persisted throughout the incubation period and released smaller amounts of phosphate. Amorphous iron and aluminum phosphates also persisted throughout the incubation period, and their rates of dissolution appeared to be controlled by the rate of diffusion of their phosphate into the surrounding soil.