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Abstract
A method for extracting sulphate from soils using strips of phosphated anion‐exchange membrane is described. The results obtained by this method are in good agreement with those obtained by extraction with Ca(H2PO4)2 solutions, and the method has a number of practical advantages over the use of phosphate solutions. No charcoal treatment, centrifuging or filtering is required, and no organic interferences are encountered during the turbidimetric measurement of the extracted sulphate. Incubation of the membrane‐treated soil and subsequent re‐extraction and measurement of sulphate produced by mineralisation provides a measure of the net sulphur mineralisation potential of soils, which may be of use in predicting fertiliser requirements of soils. Some results on New Zealand soils are presented.