Abstract
The leveling of a paddy field is one of the important items in farming. The examinations were carried out on the role of rotary tilling/puddling works for soil movement. Main results obtained are as follows:
(1) Rotary tilling works has the effect of making a paddy field surface smooth, but doesn't have the effect of making a surface flat.
(2) A puddling works can be expected to have the effect of making the whole height of paddy field equal. If working number of times were increased to get equal level, the density of a tractor wheel tracks becomes higher than other parts. And as a result, puddling works often causes irregular surface of paddy field.
