Abstract
In order to improve the rate of soil pulverization in paddy fields and rotational fields, these studies were carried out. In the case of paddy fields, the rate of soil pulverization of 70% was obtained in tillage by straight blade type rotary, and its value showed an increase of 10% compared with the tillage by curved blade (Japanese curved blade) type rotary. Moreover the tilling power requirements of straight blade type rotary showed a decrease of 10% compared with curved blade type rotary. In the case of rotational fields and first year of rotation, the rate of soil pulverization of 60-85% were obtained in tillage by up-cut rotary, and its value showed an increase of 10-15% compared with the tillage by usual rotary. Buried percentage of clum and hill of barley by up-cut rotary were at higher values than its values by usual rotary. However, in the case of 3rd year of rotation, the rate of soil pulverization showed low values. The tilling power requirements showed an increase of 10% compared with usual rotary.
