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.簡単な構造であって、製品の価格と流通の費用が節減されるにもかかわらず、地面に対するまぐわ板の傾斜角度を自由に調節して、効率的に平坦化作業を行なうことができ、作業中にまぐわ板に過負荷が作用したり、不注意によりまぐわ板が田の畔などの障害物にぶつかったりしても、容易に損傷されないようなトラクター用まぐわ。トラクター後側のロータべーター(2)にヒンジ結合されて回動昇降する複数個のコネクテイングロッド(10)、その後端に上下回動ずるようにヒンジ結合されたまぐわ板(20)、まぐわ板(20)の上方に突出形成されたコネクテイングアーム(22)と、ロータべーター(2)の上部に装着されてまぐわ板(20)のコネクテイングアーム(22)の上端部にヒンジ結合された昇降シリンダー(50)からなる。まぐわ板(20)と昇降シリンダー(50)とを連結するヒンジ軸(22a)は、まぐわ板(20)とコネクテイングロッド(10)とを連結するヒンジ軸(23a)に対して上方に位置し、まぐわ板(20)は、それが上方に持ち上げられた状態で昇降シリンダー(
