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Soil Science Society of America Journal Abstract -

Inositol Hexaphosphate: III. Content in Soils1


This article in SSSAJ

  1. Vol. 22 No. 4, p. 296-298
    Received: Feb 3, 1958
    Accepted: Feb 18, 1958

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  1. A. G. Caldwell and
  2. C. A. Black2



Samples of 49 soils were analyzed for inositol-hexaphosphate phosphorus in the meso form and a supposed isomer of this form. Anion-exchange chromatography was used to make the separations. The quantities of phosphorus present in the two isomers were correlated (r = 0.73), the phosphorus in the supposed isomer averaging 46% of that in the meso form. The total inositol-hexaphosphate phosphorus averaged 39γ per g. of soil and made up an average of 17% of the total organic phosphorus with a range from 3 to 52%. Of the factors examined, the content of organic phosphorus in forms other than inositol hexaphosphate provided the best prediction of inositol-hexaphosphate phosphorus. After the quantities of this noninositol-hexaphosphate organic phosphorus had been taken into account, the soil pH and content of free iron oxide were not of significant independent value in predicting the content of inositol-hexaphosphate phosphorus. The percentage content of inositol-hexaphosphate phosphorus in the organic phosphorus was higher in soils developed under forest vegetation (24%) than under grassland vegetation (14%) and decreased with increasing pH in both types of soils. The ratio of inositol-hexaphosphate phosphorus to other forms of organic phosphorus averaged the same in samples of 10 cultivated soils as in samples of the corresponding virgin soils, thus indicating that the inositol-hexaphosphate phosphorus decomposed at about the same rate as the other forms of organic phosphorus.

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