PROBLEM TO BE SOLVED: To measure a mileage on a headland by a rotation amount of a wheel, and an error may occur in the above measurement due to a change in a slip ratio of the wheel. SOLUTION: A GPS receiver 28 capable of detecting the position information of a traveling machine body and the longitudinal direction line L0 of the traveling machine body is provided, the forward direction at the time of planting is specified by the longitudinal direction line, and the planting clutch in the previous stroke is applied. The cut position and the same position in the forward direction after turning the headland are specified by the position information, and a notification for prompting the lowering operation of the planting work machine and the start of planting is performed at the same position. [Selection diagram] Fig. 3【課題】枕地での走行距離を車輪の回転量で測定すると、車輪のスリップ率の変化により、上記測定に誤差を生じることがある。【解決手段】走行機体の位置情報及び走行機体の長手方向線Ｌ０を検知し得るＧＰＳ受信機２８を備える、上記長手方向線により植付時の前進方向を特定し、前行程における植付クラッチを切った位置と枕地旋回後の前記前進方向における同じ位置を前記位置情報で特定し、該同じ位置において植付作業機の下降操作及び植付開始を促す報知を行う。【選択図】図３
