PROBLEM TO BE SOLVED: To prevent excessive spraying of chemicals over second and third seedling boxes in a spare seedling-feeding apparatus equipped with a chemical-spraying device when a last seedling box (fourth seedling box) is pulled out, as the chemicals have been sprayed if the box is carelessly pulled out, though the spraying apparatus has been stopped in this state.SOLUTION: A rear seedling position-detecting means SW-D and a front seedling position-detecting means SW-E are installed for the last spare seedling (A) on the spare seedling feeding apparatus 22, when both seedling position-detecting means SW-D, -E detect a seedling, the chemical spraying is stopped, and when both position detecting means detect no seedling, the chemical spraying is restarted.COPYRIGHT: (C)2013,JPO&INPIT【課題】薬剤散布装置を備える予備苗給送装置において、最後部の苗箱(4番苗箱)を抜き取る際に、この状態で散布装置は停止しているが、不用意に抜き取ると散布装置から薬剤が散布されてしまい、2番苗箱・3番苗箱上に薬剤が過剰に散布されることを防止すること。【解決手段】予備苗給送装置22上の最後部の予備苗Aに対し、後部の苗位置検出手段SW-Dと前部の苗位置検出手段SW-Eとを設け、両苗位置検出手段SW-D,-Eの苗の検出で薬剤の散布を停止し、両苗位置検出手段の苗の非検出で薬剤の散布を再開する。【選択図】図3
