PROBLEM TO BE SOLVED: To quickly ground a ground-leveling apparatus, to start a ground-leveling operation and to prevent desolation of a field surface caused by grounding of a ground-leveling rotor in an irrotational state.SOLUTION: The riding transplanter sets an operation position in which the ground-leveling rotor 33 is grounded in a rise and fall range of the ground-leveling apparatus 22 to level the field surface, a storage position in which the ground-leveling rotor 33 is evacuated upward from the field surface and a preparation position in which the ground-leveling rotor 33 is made to stand by between the operation position and the storage position. When a planting implement 3 is in a rising state, the ground-leveling apparatus 22 is in the storage position when the planting implement 3 is in a falling state and a traveling body 1 is in a traveling stop state, the ground-leveling apparatus 22 is in the preparation position when the planting implement 3 is in a falling state and the traveling body 1 is in a traveling state, the ground-leveling apparatus 22 is in the operation position and when falling from the preparation position to the operation position, the ground-leveling apparatus 22 is in a falling action while rotating and driving the ground-leveling rotor 33.COPYRIGHT: (C)2013,JPO&INPIT【課題】整地装置を速やかに接地させて整地作業を開始すると共に、整地ロータが非回転状態で接地して圃場面を荒らすことを防止する。【解決手段】整地装置22の昇降範囲に、整地ロータ33を接地させて圃場面を整地する作業位置と、整地ロータ33を圃場面から上方に退避させる格納位置と、整地ロータ33を作業位置と格納位置との間で待機させる準備位置と、を設定し、植付作業機3が上昇状態のときは、整地装置22を格納位置とし、植付作業機3が下降状態で、かつ、走行機体1が走行停止状態のときは、整地装置22を準備位置とし、植付作業機3が下降状態で、かつ、走行機体1が走行状態のときは、整地装置22を作業位置とし、準備位置から作業位置への下降に際しては、整地ロータ33を回転駆動させながら整地装置22の下降動作を行う。【選択図】図11
