Premium
Use of Isotopic Dilution in a Study of Inorganic Phosphorus Fractions from Different Soils
Author(s) -
Dunbar Andrew D.,
Baker Dale E.
Publication year - 1965
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/sssaj1965.03615995002900030012x
Subject(s) - soil water , phosphate , lime , chemistry , phosphorus , dilution , fluoride , isotope dilution , ultisol , environmental chemistry , inorganic chemistry , chromatography , geology , metallurgy , soil science , materials science , mass spectrometry , physics , organic chemistry , thermodynamics
The study consisted of a factorial experiment in which each of seven widely different soils was treated with 0 and 1 lime requirements and 0, 500, and 1,000 ppm of P. Prior to fractionating the soil P, a constant amount of P 32 was added to each sample. The results indicate that for these acid soils, P was extracted predominantly with the aluminum phosphate and iron phosphate fractions. Results for isotopic dilution indicated that the different P fractions ranked in the following order with respect to amounts of active solid phase P removed per unit of solid phase P: water soluble P > aluminum phosphate > iron phosphate > calcium phosphate. The rapidity with which P 32 reached an equilibrium with P extracted from soils with NH 4 F (aluminum phosphate) indicates why fluoride‐extractable P has correlated highly with availability of soil P.