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Effect of Drying on Volcanic Ash Soils in Chile¹

C. Gonzalez, I. Vergara and G. Galindo, Assistant Prof. of Analytical Chemistry

A. Schatz, Soil Scientist

University of Chile, Santiago, Chile

ABSTRACT

Air drying produces significant irreversible changes in volcanic ash soils. Air-dried samples with clay texture in the field appear to have sandy texture according to laboratory analyses. Air-drying also markedly affects cation-exchange capacity, soluble P, and soluble Fe. The nature and extent of changes in the latter two properties vary with different methods of analysis. Air-drying decreases the pH slightly. These results show that mechanical and chemical analyses of volcanic ash soils more accurately indicate field conditions when samples contain moisture at field capacity.

¹ Contribution from the Department of Analytical Chemistry, Faculty of Chemistry and Pharmacy, University of Chile, Santiago, Chile.

Received for publication September 25, 1964. Accepted for publication March 26, 1965.