CONSTITUTION: A sheet edge seal member 10 comprises a first engaging member 12 and a second engaging member 14, which is used for a subirrigation system (100) comprising a water barrier sheet 50 which is formed into a groove shape having an upper opening and embedded in a cultivation field (102) and perforated pipe 52 inserted into the water barrier sheet. The first engaging member comprises a dam part 22 and a first fitting part 20 projecting from a peripheral part of the dam part. The second engaging member sandwiches and fixes an end part of the water barrier sheet together with the first fitting part therebetween in a waterproof manner.EFFECT: Since an end part of the water barrier sheet is sealed pertinently, undesired leakage of water from the end part of the water barrier sheet is prevented.SELECTED DRAWING: Figure 7【構成】 シート端封止部材１０は、第１嵌部材１２および第２嵌部材１４を含み、上側開口の溝状に形成されて耕作地（１０２）に埋設される遮水シート５０と、遮水シート内に挿通される有孔管５２とを備える地下灌漑システム（１００）に用いられる。第１嵌部材は、堰部２２と堰部の周縁部から突出する第１嵌合部２０とを有する。第２嵌部材は、第１嵌合部との間で遮水シートの端部を水密的に挟み込んで固定する。 【効果】 遮水シートの端部を適切に封止できるので、遮水シートの端部からの意に反する水の流出を防止できる。【選択図】 図７
