Characteristics of decomposed granite soil distributing in Tottori prefectural regions [Japan]
1996
Takuma, K. (Tottori Univ. (Japan). Faculty of Agriculture) | Yasuda, H.
To 29 soil specimens sampled from the unreclaimed land in Tottori prefecture, its soil test and investigation were carried out to understand their characteristics. In the decomposed granite soil produced in the prefecture, a quartz distributes in a wide band, a feldspar is contained richly, and it is similar to the Hiroshima-, Okayama-, and Rokko-decomposed granite soils which contain a few color mineral. The decomposed granite soil in the prefecture belongs to Cretaceous granite rocks and it can be characterized by its ignition loss and fine-grained fraction among various characteristics of the decomposed granite soil. As the result of a principal component analysis for seven soil factors, it was difficult to decide the regional and geological classification of granitic rocks using these decomposed granite soils due to a narrow range of dispersion values in its density of soil particle and the coefficient of permeability. As a general value of the decomposed granite soil in the prefecture, it was estimated that the density of soil particle is 2.64 to 2.66 g/cubic-cm, natural water content is 11 to 16%, fineness number is 27.3 to 31.3%, ignition loss is 3.4 to 4.8%, and the coefficient of permeability is 0.7 to 1.6 x 10(-3) cm/s
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