The Characteristics of Tea Soils (Part 7):On the Tea Soil Derived from the Tertiary Shale Soil

概要

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The characteristics of the tea soil, uncultivated soil and cultivated soil derived from the tertiary shale soil were investigated. 1. These soils were heavy clay soils containing more than 50% of clay but in the tea soil, it was observed that the clay was slightly leached from the surface layer and accumulated on the under layer. Generally, the differences of physical properties among the tea soil, uncultivated soil and cultivated soil were nearly found. 2. The acidity, exchangeable bases content and soluble aluminium content were different with the kind of soil, namely, the acidity was strongest and the exchangeable bases were least in the tea soil. Accordingly, the saturation degrees of exchangeable bases and calcium in the tea soil were lower than those of other soils. Aluminium contents soluble in various solutions were larger in the tea soil than in other soils and in every soil, the content of exchangeable aluminium was much that of active aluminium. 3. The differences of composition of clay and active oxide (Si02, Al2O3, Fe203) contents in these soils 'were not clear. Generally, it was seemed that the decomposition, translocation and accumulation of clay were not vigorously performed in these soils.
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