PROBLEM TO BE SOLVED: To fundamentally prevent the formation of a root mat and achieve optimal irrigation by bottom side irrigation.SOLUTION: A plant cultivation device 1 carries out bottom side irrigation of soil 12 with water from a water storage tank (water storage vessel) 13 by capillary action from a sheet-like irrigation cloth 11 laid on the bottom side of a plant cultivation vessel 10 with an inclined bottom part. Depending on the irrigation, a float switch 14 acting as a water level sensor detects a decrease in the water level of the water storage tank 13 and on the basis thereof an auxiliary irrigation device 15 performs auxiliary irrigation on the soil 12 from above the plant cultivation vessel 10. Accordingly, a water retaining region R is formed in the vicinity of the roots of a cultivated plant P, and excess water not used in the formation thereof flows down the incline of the plant cultivation vessel 10 into the water storage tank 13.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】ルートマットの形成を根本的に阻止し、底面潅水にて最適な潅水を実現する。【解決手段】植物栽培装置1は、傾斜状の底部を有する植物栽培容器10の底面に敷かれたシート状の潅水布11の毛管現象により、貯水タンク(貯水容器)13の水の底面潅水を土壌12に行う。この潅水により、水位センサとしてのフロートスイッチ14が貯水タンク13の水位の低下を検知し、これに基づき補助潅水装置15にて植物栽培容器10の上方より土壌12に補助潅水を行う。これにより栽培する植物Pの根の周囲に保水領域Rが形成され、その形成に用いられなかった余剰水は植物栽培容器10の傾斜より貯水タンク13に流入する。【選択図】図1
