Plant and Soil

, Volume 151, Issue 1, pp 143–146

Preparation of iron oxide-impregnated filter paper for use in the Pi test for soil phosphorus

  • R. G. V. Bramley
  • S. P. Roe
Short Communication

DOI: 10.1007/BF00010795

Cite this article as:
Bramley, R.G.V. & Roe, S.P. Plant Soil (1993) 151: 143. doi:10.1007/BF00010795


The efficiency of recovery of P by iron oxide-impregnated filter paper, as used in the new Pi test for soil phosphorus, was found to depend on the method used for impregnating the paper with iron oxide and could range from as little as 28% to more than 98%. The greatest efficiency of recovery was obtained with filter papers which had been washed with deionised water following iron oxide-impregnation. These filter papers were also found to give the most reproducible results. ei]{gnB E}{fnClothier}

Key words

iron oxide-impregnated filter paperphosphorusPi soil test

Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • R. G. V. Bramley
    • 1
  • S. P. Roe
    • 1
  1. 1.CSIRO Division of Animal ProductionWembleyAustralia
  2. 2.Davies LaboratoryCSIRO Division of SoilsAitkenvaleAustralia