Abstract
Surveying the relation of the draft resistance, the vertical suction and the cutting angle, we obtained the following results.
The draft resistance did not be varied by the increase of the suction.
The draft resistance not related to the suction, but it enlarged with the increase of the cutting angle.
On the field, we used the plow that added to 10 kg weights on the center of gravity and that not added the weight, and the working depth was increased by adjustment of the hitch.
The min. specific resistance was 0.33Kg/cm2 in the range of 9-10cm depth on the no-load plow, but 0.32Kg/cm2 in the range of 13-14cm depth on the 10kg loaded plow.
Wb/a tanθ=H was formed of on this equilibrium point; that is the min. point of specific resistance.
We found that its weight and the position of the center of gravity had important connection with the deep plowing, and one of cause that the specific resistance increased with the working depth, was due to the increase of the cutting angle of the plow.
