PROBLEM TO BE SOLVED: To provide an underground irrigation system that can be suitably used on a slope land since the amount of moisture in a plough layer can be kept as even as possible without needing equipment such as water-table management equipment.SOLUTION: The underground irrigation system 10 includes a sealing member 12 to be buried in the ground of a cropland 200 and supplies water from the underground to keep the amount of moisture in soil in a state appropriate for the growth of a plant. The sealing member is formed of a material having a sealing property in an elongated groove-like shape and is buried in the ground with its longitudinal direction being along the slope of the cropland 200. A water-holding member 14 having a water-absorbing property and water-holding property is provided at the bottom of the inside of the sealing member 12, and a water supply member 16 is disposed through the water-holding member 14. In the underground irrigation system 10, water from a water supply source 30 is supplied to the water-holding member 14 by the water supply member 16 during the irrigation. The water absorbed and held by the water-holding member 14 is soaked up and supplied to the soil above by capillary action.COPYRIGHT: (C)2013,JPO&INPIT【構成】 地下灌漑システム10は、耕作地200の地中に埋設される遮水部材12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。遮水部材は、遮水性を有する材質によって細長い溝状に形成され、その長手方向が耕作地200の傾斜に沿うように地中に埋設される。遮水部材12内の底部には、吸水性および保水性を有する保水部材14が設けられ、この保水部材14を介して、給水部材16が配設される。この地下灌漑システム10では、灌漑時には、給水源30からの水が給水部材16によって保水部材14に給水される。そして、保水部材14が吸収して保水した水が上側の土壌に毛細管現象によって吸い上げられて供給される。【効果】 水位管理器等の設備を必要とすることなく、作土層の水分量を可及的均等に保つことが可能であるので、傾斜地にも好適に用いることができる。【選択図】図1
