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Some Chemical and Physical Properties of Different-Sized Natural Aggregates from Iowa Soils¹

ABSTRACT

This study presents data concerning different chemical and physical properties of various-sized, undried aggregates from seven surface soils and seven subsoils from Iowa.

There was little or no difference in exchangeable K, extractable P, pH, or the percentages of sand, soilt, or clay in the different-sized aggregates from any one soil sample. In some soils, organic carbon content tended to increase, and bulk density tended to decrease as the aggregate size decreased. The bulk densities of the aggregates were inversely related to the percentages of organic carbon in the aggregates.

¹ Journal Paper no. J-5795 of the Iowa Agr. & Home Econ. Exp. Sta., Ames. Project no. 1190.

² Research Associate and Professor of Soils, respectively.

Received for publication January 23, 1968. Accepted for publication April 1, 1968.