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The Distribution of Important Soil Forming Minerals in Pennsylvania Soils¹

ABSTRACT

The determination of the distribution of the feldspar and clay mineral groups in 650 surface soils of the various counties in Pennsylvania indicates that the variations noted point toward important relationships between mineral composition and agricultural value. The most valuable soils agriculturally are those where the feldspar of the very fine sand fraction is greater than 17% and the predominant clay mineral is a low fixer of potassium. This study indicates that the mineral composition of soils should be taken into account when soil studies involving fertilization application, maintaining soil productivity and soil description are undertaken.

¹ Authorized for publication Aug. 17, 1955 as paper No. 2003 of the Journal Series of the Pennsylvania Agr. Exp. Sta., University Park, Penn.

² Prof. of Soil Technology, American Potash Institute Fellow, National Science Research Foundation Fellow, respectively. Grateful acknowledgement is made to the American Potash Institute for financial support which made part of this study possible.

Received for publication August 5, 1955.