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Inositol Hexaphosphate: III. Content in Soils¹

ABSTRACT

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 39 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.

¹ Contribution from the Department of Agronomy, Iowa State College. Journal Paper No. J-3269 of the Iowa Agr. and Home Econ. Exp. Sta., Ames, Iowa. Project No. 1183. Presented before Div. II, Soil Science Society of America, Nov. 15, 1956, at Cincinnati, Ohio.

² Former Graduate Assistant (now Associate Professor of Agronomy, Texas A. and M. College) and Professor of Soils, respectively. The senior author is indebted to the Agricultural Institute of Canada and the Research Council of Ontario for financial assistance during the early part of this investigation.

Received for publication February 3, 1958. Accepted for publication February 18, 1958.