Fundamental Data on the Deep Tillage Using “Bulldeeper”, U Typed Soil Pulverizing Blade, for Small Power Tiller

Abstract

The relation between the regulation of “Bulldeeper” and its faculty in the rice field was investigated, and the following results were obtaind.
(1) The slicing angle of the blade (3°-6°) gives much influences on the tilling depth, especially when the blade-length was adjusted longer than 41cm.
(2) The tractive resistance of the blade is reduced due to the thrust of the rotating rotary.
The percentage of the reduced pull increases with the shorter blade, and is much influenced by θ (θ: slant angle of the blade).
(3) The thrust of the rotary increases with the tilling depth of rotary D_R, and is nearly eqaul regardless of that of the blade D_B under certain D_R.
(4) The tractive resistance differs with the adjustments of devices, by which to regulate slicing angle and the length of blade, in spite of the same tillage depth of the blade.
(5) The influences of increasing the tillage depth of (D_B-D_R) and (D_R1-D_R2) respectively on the tractive esistance were compared,
where D_R1: deep tilling depth of rotary
D_R2: shallow tilling depth of rotary.
(6) Result of an efficiency test for deep tillage is followed.
Net required hours/10a Running speed (m/sec) Time for turn at head land (sec)
h min 2.30 0.21-0.26 23