Abstract
The results of investigation are summarized as follows.
(1) Soil structure exerts influence upon evaporation, especially when the soils wet to the extent of field moisture capacity. But when the soil is too wet, it does not exert much influence.
(2) There are different aspects to the evaporation of soil structure where there is a layer of discontinuity between the uper soil the layer and the lower soil layer, and where there is not.
(3) The soil structure that has the layer of discontinuity controls the evaporation, but the soil structure that has not hasten, remarkably when the soil structure that holds the aproxmate field moisture capacity.
(4) For research into the theory of cultivator, we must ascertain above disposition by the practical experiment in the field after this.
