SOILS DERIVED FROM VOLCANIC ASH IN CENTRAL AMERICA

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Abstract
Thirty-nine Andepts from Costa Rica, Nicaragua, El Salvador, and Guatemala were studied. The main purpose of this work was to characterize the morphological, physical, and chemical properties and their relationships to elucidate on the problems of soil genesis, classification and productivity. The soils studied exhibit a relatively uniform morphology and contain large amounts of amorphous materials derived from volcanic glass. They have dark color, loamy texture, fluffy structure, thixotropic consistence, low bulk density, high specific surface area and exchange capacity, and acid reaction. Most are Dystrandepts and a few are Vitrandepts, Eutrandepts, and Hydrandepts. They are low in N and P, with moderate contents of exchangeable bases.
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