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The Williams phosphorus fractionation procedure for soils has been modified to make it suitable for the rapid routine analysis of soils of low phosphate status. The total phosphorus is determined by digestion with perchloric acid, followed by application of the vanadate colorimetric method. The fractions extracted by acetic acid and sodium hydroxide are treated by wet digestion methods to remove organic matter and 8‐hydroxyquinoline.
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M. H. Bertheux (1958) studied this question.
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