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A semi‐micro routine procedure for the partial fractionation of soil phosphorus
Author(s) -
Rennie Peter J.
Publication year - 1956
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740070310
Subject(s) - fractionation , extraction (chemistry) , soil water , phosphorus , chemistry , environmental chemistry , environmental science , chromatography , soil science , organic chemistry
A semi‐micro procedure for the partial fractionation of soil phosphorus compounds is described, which has been developed for certain agricultural, forest and moor soils, containing down to 0.002 mg. of P per g. of soil for particular P fractions. The procedure uses a semi‐micro adaptation of McClean's acid attack for the extraction of total P, and Williams' extractants for the initial fractionation. All extracts receive similar simple preparative treatment, P then being estimated colorimetrically by reduction of phosphomolybdate with ‘ metol’. Critical steps in the procedure are discussed in brief experimental notes, and examples of fractionation data are included to demonstrate the necessity, when comparing different soil horizons, of expressing these data on a soil‐volume basis.