[PROBLEMS] To provide a concealed, environmentally protected hydroponic system that can eliminate consumables, is washable, can protect the environment, and can provide moisture and nutrients corresponding to the length of roots in different growth periods of plants. To do. A light source, moisture and nutrients necessary for a plurality of plants are supplied, and at least two upper and lower layers are provided, and a plurality of cultivation ports 21 are provided on the upper edge thereof so that water can flow from the upper layer to the lower layer. A hydroponics tube 20, a water level adjusting lid 30 provided at an end slightly lower than the height of the hydroponics tube, and a sealing lid 31 provided at an end slightly higher than the height of the hydroponics tube are provided. Furthermore, the connection hose 32 for communicating the water level adjusting lid located in the upper layer and the sealing lid located in the lower layer, the water supply box 60 communicating with the higher end of the hydroponics tube located in the uppermost layer, and the lowermost layer A water storage box 50 communicating with the lower end of the hydroponics tube, and a plant illumination light source 80 provided above the hydroponics tube at an appropriate distance. [Selection] Figure 1【課題】消耗品を無くすことができ、洗浄可能であり、環境保護でき、植物の異なる成長期での根部の長さに対応して水分及び栄養分を提供できる光源隠れ式環境保護水栽培システムを提供する。【解決手段】複数の植物の必要な光源、水分及び栄養分を供給し、少なくとも上下の２層を有し、その上縁に複数の栽培口２１が設けられ、水が上層から下層へ流れ可能である水栽培チューブ２０と、水栽培チューブの高さよりもやや低い端部に設けられる水位調整蓋３０と、水栽培チューブの高さよりもやや高い端部に設けられる密封蓋３１とを設ける。さらに、上層に位置する水位調整蓋と下層に位置する密封蓋を連通するための連接ホース３２と、最上層に位置する水栽培チューブのより高い端部と連通する送水箱６０と、最下層に位置する水栽培チューブのより低い端部と連通する貯水箱５０と、適宜の距離で水栽培チューブの上方に設けられる植物照明用光源８０と、を含む。【選択図】図１
