土粒の分散に及ばす置換性塩基の影響

抄録

Of two soils, alluvial and volcanogenous, mechanical analyses were made after pippet method. (See Table 1) Before these analyses, the soils were brought to have various bases, such as K, Na, Ca, and Mg, also H, in exchangeable form, by being treated with the chloride of each base or with diluted HCl. Of each treated soil, 20g was applied to the analysis. (See Table 2.) By the results of these analyses, it was understood that the degree of dispersion, shown by the amount of determined clay, was conditioned by the kind of exhchangeable base as well as H. Of alluvial soil, the highest dispersion was got by Mg; while, of volcanogenous soil, by Na or H. This difference in bases or cations, which caused the soils to be highly dispersed, was supposed to be due to the difference in the kind of clay in these soils.