Abstract
In clay soil of loose condition, as reported in part 2,there is no change in percentage of soil pores with or without Krillium. In clay soil of compact condition, are less with Krillium pores than without. In Ca system there is no change in soil pores by the addition of Krillium, but in Na system Krillium causes soil pores to increase. When the water added to soil increase, pores in the soil of loose condition with or without Krillium increase, and pores are more in soil of loose condition than that of compact condition. If the amount of added water exceeds a certain increase, there is no influence of Krillium on the increase of soil pores. Soil samples with more than 25% of added water is not desirable for the experiment. Maximum air content of clay soil is not influenced by Krillium in loose condition, but it decreases by Krillium in compact condition. Maximum air content decreases by increasing the volume of added water to soil and is not influenced by the amount of Krillium added in both conditions. Minimum air content of soil increases by increasing the amount of Ca-Krillium, but it decreases by Na-Krillium in both conditions, loose and compact, of dry soil samples. When water is added, the minimum air content increases, and in Ca system the increase is greater than in Na system in both condition. There is much influence of Krillium upon glanulation : in Ca system, 1〜2 mm aggregates are much and in Na system 0.5〜1 mm aggregates are much as shown in table 4.
