Abstract
In order to consider the effects of cultivator to the permeability of soil to air, we investigated the relation of air permeability to soil texture and structure, and obtained the following conclusions.
(1) The air permeability depends upon the soil structure: it decreases with decreasing air capacity of the soil.
(2) The presence of a thin compacted layer at the soil surface especially reduces permeation to air.
(3) Therefore, arranging aggrigates or large clods upon the soil surface is desirable for the improvement of the air permeability.
(4) The data in this investigation clearly shows the effect of cultivator to the improvement of the air permeability, but it is dangerous to apply these results directly tothe practical effects of cultivator, because it differs the kind of tine, the method of operation, the kind of crop and the time of growth.
