PROBLEM TO BE SOLVED: To provide a subirrigation system which utilizes the permeation function of the soil itself to cause no decrease in the permeation function due to clogging and thereby facilitate maintenance, and also controls the water level control of gravity water at the water-supply side to be free from supply of unnecessary water, and thereby enables the efficient use of water resource.SOLUTION: The subirrigation system 10 includes a water-barrier member 16 to keep the water content of the soil of a cultivation land 200 in a suitable state for the growth of plants. The water-barrier member 16 is formed into a top-open container shape and given a water reserving function. The inside of the water-barrier member 16 is supplied with water from a water tank 12 via a water supply pipe 14, so as to form a soil portion 26 into a gravity water state. The water level 28 of the gravity water in the water-barrier member 16 is properly administered to be a desired one with a water level administrator 18 disposed in the water supply pipe 14. The gravity water inside the water-barrier member 16 which is administered to have the desired water level, is optionally sucked up into the soil at the upper layer by the capillary phenomenon. As a result, a capillary water-state soil portion 30 having the proper water content is formed in the cultivation land 200.COPYRIGHT: (C)2010,JPO&INPIT【構成】 地下灌漑システム10は、遮水部材16を含み、耕作地200の土壌の水分量を植物の生育にとって適切な状態に保つ。遮水部材16は、上側開口の容器状に形成され、貯水機能を有する。遮水部材16の内部には、水タンク12から給水管14を介して水が供給されることによって、重力水状態の土壌部(26)が形成される。この遮水部材16内の重力水の水位(28)は、給水管14に設けられる水位管理器18によって、所望の水位に適切に管理される。所望の水位に管理された遮水部材16内の重力水は、毛細管現象によって上層の土壌に適宜吸い上げられる。これによって、適切な水分量を有する毛管水状態の土壌部(30)が耕作地200に形成される。【効果】 土壌自体の浸透機能を利用するので、目詰まりによる浸透機能の低下が発生せず、維持管理が容易となる。また、給水側で重力水の水位管理を行うので、無駄な水が供給されることが無く、水資源を効率的に利用できる。【選択図】 図1
