抄録
We investigated the process of sticking condition of the soil on the surface of plow bottom at field, and we found tendencies as follows.
1) The film of soil is formed on the suaface of plow bottom by some certain causes which however we cannot yet understand, and gradually groves until it forms the primary layer or soil on the plow surface.
2) In the same process, it seems, the secondary layer is formed on the surface of the primary layer This repeats. over and over again until a large stable layer is grown up on the plow surface.
3) The thickness and the stability of the layer is determined generally by the soil condition.
4) Furthur invetigation will be made on the factor which determines the thickness and the stability of the layer.
