Being simple structure, price of the product and cost of circulation retrench even adjusting the inclined angle of the ma gu wa board for the land in spite, freely, it is possible efficiently to do levelling job, the ma gu kind of wa for the tractor where overload does not operate the ma gu wa board while job, with carelessly the ma gu wa board striking to obstacle such as the levee of the rice field, is not damaged easily. Rotor be ta of the tractor back the hinge being connected by (2), plural konekuteingurotsudo which time dynamic ascent and descent it does (10), top and bottom time motion it is sly in the rear end the way, the hinge it is connected and the cartridge gu wa board (20), the ma gu wa board (20) konekuteinguamu which it was projected was formed in the upper part (22) with, rotor be ta (2) it is installed on top and the ma gu wa board (20) konekuteinguamu (22) the hinge is connected the ascent and descent cylinder which (50) it consists of in the top. When the ma gu wa board (20) with the ascent and descent cylinder (50) with the hinge axis which is connected (22a), it is located to the upper part the ma gu wa board (20) with konekuteingurotsudo (10) with the hinge axis which is connected (23a) vis-a-vis, the ma gu wa board (20), the ascent and descent cylinder (50) it expands when you can raise to upward that, it falls to land side, when the ma gu wa board (20) after contacting the land, continuously the ascent and descent cylinder (50) it makes expand, it can adjust the inclined angle for that land.
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