Abstract
Abstract Native volcanic ash topsoil was removed in order to expose buried alluvial soil, on which the present experiment was conducted under cultivation for three years. The crop yield on the exposed soil was far lower in the first year as compared to that of common furrow slice soils, followed by a gradual increase during the experimental period. Even though desurfaced, the soil showed a higher productivity than the original topsoil in the third year. Addition of fused phosphate and barnyard manure increased the ratio of aerobic bacteria to fungi and some microbial activities, and as a result, the increase in crop yield on the soil was accelerated. Desurfacing should thus be a practical amerioration procedure, particularly in the case of the soil.
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