The present invention in agricultural land or the like accumulated water such as paddy fields, or Hasuda, fertilizers, and a device for injecting a liquid medicine such as an oxygen supply agent, suitable for melasma measures lotus root which can be injected into the ground under water to provide a liquid injector. Along with the float in A water surface 9 glue people and riding section 2 moving in the drive of the propulsion source, the hole is drilled in the riding section and up and down slidably assembled frame body, the tip is fixed to the frame and become more injection part and the nozzle 3c for discharging the chemical liquid 5a which is fed from the chemical liquid tank and consists, after stabbing the nozzle lowering the frame to the ground 10, to inject liquid medicine into the ground. The drug solution and by an oxygen supply agent, the prevention of lotus root melasma, it is possible to reduce. .BACKGROUND 4【課題】水田又は蓮田などの水を溜めた農作地等に、肥料、酸素供給剤などの薬液を注入する装置であり、水面下の地中にも注入できるレンコンの黒皮症対策に適した薬液注入装置を提供する。【解決手段】人が乗り水面9に浮くとともに推進源の駆動で移動する搭乗部2と、搭乗部に上下スライド可能に組み立てられた枠体と、枠体に固定され先端に穴が穿設され薬液タンクから送液された薬液5aを吐出するノズル3cとよりなる注入部と、からなり、枠体を降下させノズルを地中10に刺した後に、薬液を地中に注入する。薬液を酸素供給剤とすることで、レンコン黒皮症の予防、低減が可能となる。【選択図】図4
