PROBLEM TO BE SOLVED: To provide an application to a field having different properties such as a paddy field or an upland field by changing the posture of a land grader.SOLUTION: The land grader 20 is designed to freely change a mounting posture through a mounting body on the tip of a rear cover body 19. The mounting posture is freely changed into a first posture wherein a land grading surface formed on the undersurface of the land grader and a land grading surface formed on the undersurface of the tip of the rear cover body are disposed on the nearly same plane, and a second posture wherein the land grading surface of the land grader 20 and the land grading surface of the tip of the rear cover body 19 are disposed nearly parallel with a difference in level. The front surface is formed in a rising state from the land grading surface of the land grader 20, and the front surface is formed as a temporary retention-generating surface part of plowed soil. In the second posture, the temporary retention-generating surface part of the plowed soil and the tip of the rear cover body 19 are separated for a prescribed width in the front and rear direction to form a temporary retention space of the plowed soil in just before the temporary retention-generating surface part of the plowed soil.COPYRIGHT: (C)2011,JPO&INPIT【課題】整地体の姿勢を変更することで水田、畑等の性状の異なる圃場に適用すること。【解決手段】整地体20は、取付体を介してリヤカバー体19の先端部への取付姿勢を変更自在となすと共に、この取付姿勢は整地体の下面に形成した整地面とリヤカバー体の先端部の下面に形成した整地面を略同一平面上に配置した第一姿勢と、整地体20の整地面とリヤカバー体19の先端部の整地面とを略平行に段差をもたせて配置した第二姿勢とに変更自在となし、整地体20の整地面から立ち上がり状に前面を形成して、同前面を耕耘土一時滞留生起面部となして、第二姿勢では、上記耕耘土一時滞留生起面部とリヤカバー体19の先端部とを前後方向に一定幅離隔させて、耕耘土一時滞留生起面部の直前方に耕耘土一時滞留空間を形成している。【選択図】図5
