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The Distribution of Nonextractable Phosphorus in Some Gray-Brown Podzolic, Brunizem, and Planosol Soil Profiles¹

ABSTRACT

Substantial amounts of phosphorus, which resists solution in conventional phosphorus fractionation solvents, are found in many soils. In this report, the insoluble phosphorus fraction is termed nonextractable phosphorus.

The distribution of nonextractable phosphorus in the horizons of four Illinois soil-type sequences developed on Peorian loess was studied. The relative proportion of the total soil phosphorus occurring in nonextractable form in the various soil horizons was B > A > C.

The very low content of nonextractable phosphorus found in the parent loessial C horizons, and the greater and variable nonextractable phosphorus contents found in the A and B horizons of soils developed on Peorian loess, suggested that the synthesis of nonextractable phosphorus forms in soils was related to weathering and soil development processes. No relation between degree of soil maturity and level of nonextractable phosphorus was apparent for the A horizons; however, a very significant increase in the nonextractable phosphorus content of the B horizons was found to occur with increasing soil maturity, particularly from the early through the medial stages of development. It was concluded that the accumulations of nonextractable phosphorus observed were associated with soil development processes.

¹ Contribution from the Department of Agronomy, Illinois Agr. Exp. Sta., Urbana, Ill. Part of a thesis submitted to the Graduate College by the senior author in partial fulfillment of the requirements for the Ph.D. degree. Published with the approval of the Director of the Illinois Agr. Exp. Sta. Presented before Div. II, Soil Science Society of America, St. Paul, Minn., Nov. 9, 1954.

² Associate Agronomist, United Fruit Company, La Lima, Honduras, and Professor of Soil Fertility, respectively. The writers wish to express their appreciation to Dr. R. T. Odell for his assistance in helping to select the soils used in this investigation.

Received for publication May 18, 1956. Accepted for publication February 5, 1957.