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The Characteristics, Classification and Genesis of Some Tropical Spodosols¹

ABSTRACT

Morphological, chemical, and mineralogical properties are presented for three tropical spodosols. Based on the occurrence in different climatic zones, the soils were distinguished as lowland podzols and mountain or highland podzols.

The lowland podzol had a low organic matter content, a weakly developed Bh and a well developed argillic horizon below the spodic horizon. The name Humic Alfic Tropoferrod is proposed for this type of podzol. The A horizon contained predominantly amorphous clay, but the B horizon had appreciable amounts of kaolinite.

Highland podzol I was high in organic matter, had a well developed Bh, but lacked an argillic horizon, and was classified as a Typic Tropohumod. Highland podzol II had similar properties, but was relatively young in degree of development and was classified as an Entic Tropohumod. The clay fraction of the humods was characterized by high amounts of amorphous clay, probably allophane. Kaolinite was not detected.

¹ Journal Series Paper no. 684, Univ. of Georgia College of Agr. Exp. Sta., College Station, Athens, Ga.

² Asst. Professor, Professor, and Associate Professor, respectively, Dept. of Agronomy, Univ. of Georgia, Athens, Ga. 30601.

Received for publication December 5, 1969. Accepted for publication May 20, 1970.