水田土壌に於ける粘土の生成に関する研究(第4報) : 湛水及び落水の影響

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Two Clay fractions (<0.15μ and 0.6〜1.0μ) were separated from paddy soils, where the stagnation, in summer, was followed by the full-drainage, in winter, and this succession was made twice in two agricultural year rounds. Of these clay fractions, chemical constituents and X-ray diffraction patterns were investigated. It was very difficult to detect the variations in clays precisely which has been induced during the succession, stagnation to drainage however, it could concluded that stagnation seemed to promote the increases of halloysite and ferrosilicates of chlorites, and also the kaolin-group minerals, such as chamosite, amesite and nontronite. Especially, this was quite remarkable, when soil was stagnated after the full-drainage during the preceeding winter. The draining in winter seemed to destruct appreciably clay minerals, formed during the stagnated summer.
社団法人日本土壌肥料学会の論文
1956-08-05