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Abstract

 

This article in SSSAJ

  1. Vol. 39 No. 4, p. 634-639
     
    Received: June 28, 1974
    Accepted: Feb 28, 1975


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doi:10.2136/sssaj1975.03615995003900040020x

Rate of Dissolution of Phosphate from Minerals and Soils1

  1. R. A. Olsen2

Abstract

Abstract

A laboratory technique was devised for conveniently measuring the rate of dissolution of phosphates in minerals and soils. The conditions imposed upon the samples were believed to be similar in several important respects to those in the close proximity of plant roots. An equation was derived which was reasonably descriptive of the dissolution process even in widely different soils. The technique was used to measure the rate of dissolution of a number of well-characterized rock phosphate samples and of many soils. The data were found to rate the samples very well with regard to their value as a source of phosphate to plants. There was no apparent advantage of measuring rates of dissolution, however, over measuring amounts “available” by means of conventional single extraction techniques. Based upon the technique studied, a simple and apparently reliable extraction technique for routine evaluations of soil as a source of phosphate is described.

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