水田土壌に於ける粘土の生成に関する研究(第3報) : 酸性水田土壌の粘土鉱物に就いて

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Four clay fractions (<0. 15μ, <0.6μ, 0.6〜1.0μ, 1.0〜2.0μ) and medium silt fraction (9〜11μ) were separated from a surface layer of a relatively poor drainage paddy soil (pH=4.90) derived from an alluvium of Abukuma River. They were investigated by chemical analysis, differential thermal analysis, and X-ray diffraction method. The following facts has been clarified through the result of our experiments. In the colloidal fractions (<0.15μ and <0.6μ), dioctahedral mixed-layer minerals predominates, accompanying small amount of halloysite, diocta-vermiculite, and illite. In the coarse clay fractions (0.6〜1.0μ, 1.0〜2.0μ), quartz and cristobalite, trioctahedral 2 : 1 type minerals (palygorskite) would predominate, and the same clay minerals as those in the finer fractions are also found to be lesser extent. In a silt fraction (9〜11μ), quartz, cristobalite, and palygorskite exist, and some chlorite and sepiolite are also supposed to be present.
社団法人日本土壌肥料学会の論文
1956-03-05