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Soil Phosphorus in South Dakota: I. Inorganic Phosphorus Fractions of Some Soil Series¹

ABSTRACT

The inorganic soil phosphorus of the upper three horizons of 16 profiles was fractionated. The soils were selected to provide for a comparison of four kinds of parent materials and two great soil groups.

The data show that, in general, the four glacial parent materials had similar proportional amounts of the inorganic P fractions. Climate, as expressed through great soil group, did affect the proportional amounts of two of these fractions, however. Among Chernozem soils the Fe-P fraction makes up a proportionally larger amount, and the Ca-P fraction a proportionally smaller amount, than they each do in Chestnut soils. Neither parent material nor climate alters the proportional amount of Al-P present in these soil series.

¹ Contribution from the Department of Agronomy, Agr. Exp. Sta., South Dakota State University, Brookings. Approved for publiciation by the Director of the South Dakota Agr. Exp. Sta. as Journal Series no. 686.

² Professor and Associate Professor of Agronomy, respectively, South Dakota State University, Brookings.

Received for publication July 7, 1965. Accepted for publication October 21, 1965.