Abstract
Physical and chemical properties of both soils, easily erodible and non-erodible, in northern Kanto district and its neighbourhood were studied. The results were summarized as follows : 1) By rational methods, specific, gravity, apparent density, moisture equivalent, and max. waters, capacity were determind. As to these properties no definite. inclination was found between two soils, easily-erodibe and non-erodible; but the soils of less clay inclined to be rather erodible. Of clod structure of the surface soil, coarese dry clod (<4 mesh) were more in the non-erodible than in the erodible, and the case was the same with the apparent density. 2) Of chemical properties, total carbon, total nitrogen, pH, exchange acidity, and base exchange capacity were determind. As to these properties, no definite inclination was found between the above two kinds of soils. But the degree of CaO saturation only inclined to be greater in the soil, non-erodible, than in that, erodible. 3) As to the nature of colloids, it was found that G_1 content by Tyulin's method was more in the non-erodible than in the erodible; while humus content was more in the erodible. Difierential thermal curves showed that the predominant clay mineral of easily erodible soils was Allophane, and that of non-erodible soils Kaolin mineral.
