Problem to be solved: to provide a construction and an environmental control method of the irrigation tube in which the irrigation tube sprinkling hole in the vinyl house cultivation is prevented from being clogged with the roots of the soil and the crop, and the surplus piping is omitted, and environmental control and CO2 can be supplied.Solution: the irrigation tube 3 is covered with a multi sheet 5 in the cultivation bed 1 having a medium installed in the gardening facility, and the water tube is disposed above the space with a plurality of arcuate support members 4 with a necessary space between the medium and the space, and the environmental control device is disposed in the space portion The environment control is carried out by facing the pipe of the supply and CO2 supply equipment.Diagram【課題】ビニールハウス栽培における潅水チューブ散水孔が土壌や作物の根で目詰まりしないようにし、余剰の配管を省略しても環境制御やＣＯ2の供給ができるようにした潅水チューブの配設並びに環境制御方法を提供する。【解決手段】園芸施設内に設置された培地を有する栽培ベッド１にマルチシート５で覆われて配設される潅水チューブ３であって、該潅水チューブは円弧状の複数の支持部材４により培地との間に所要の空間部をもって上方に配設され、該空間部に環境制御装置およびＣＯ2の供給装置のパイプを臨ませて環境制御を行うようにした。【選択図】図１
