PROBLEM TO BE SOLVED: To provide an underground irrigation system which can properly keep a water level of gravitational water in a soil portion without needing a facility such as a water level management unit, and thus can be suitably used to a slope.SOLUTION: The underground irrigation system 10 includes a water-stopping member 12 buried in the ground, and water supply members 14, 14a, 14b, and keeps the moisture in the soil in a condition proper for growth of plants by supplying water from under the ground. The water-stopping member 12 is a halved pipe obtained by cutting a corrugated pipe into two along the axial direction, and a plurality of groove portions 20 are formed on the inner surface side of the pipe to be aligned at axial intervals. In the underground irrigation system 10, water from a water supply source 16 is supplied into the groove portions 20 of the water-stopping member 12 through the water supply members 14, 14a, 14b to form soil portions 28 in a gravitational water state within the groove portions 20, and water is supplied therefrom to the soil by capillary action.COPYRIGHT: (C)2013,JPO&INPIT【構成】 地下灌漑システム10は、地下に埋設される遮水部材12、および給水部材14,14a,14bを含み、地下から水を供給して土壌中の水分を植物の生育にとって適切な状態に保つ。遮水部材12は、波形管を軸方向に沿って2つに切断した半割り管であり、その管内面側には、軸方向に間隔を隔てて並ぶ複数の溝部20が形成される。この地下灌漑システム10では、灌漑時には、給水源16からの水を給水部材14,14a,14bによって遮水部材12の溝部20内に供給して、溝部20内に重力水状態の土壌部28を形成し、そこから毛細管現象によって土壌に水を供給する。【効果】 水位管理器等の設備を必要とすることなく、土壌部の重力水の水位を適切に保つことができるので、傾斜地にも好適に用いることができる。【選択図】図1
