PROBLEM TO BE SOLVED: To provide a low-cost irrigation system using permeation into a sunken pipe, the system protecting the irrigation farmland from being affected by a salt damage as much as possible and capable of changing irrigation subsurface depth in order to promote the growth of plant roots.SOLUTION: Small amount of irrigation water from a feed water tank 2 is conveyed in a proper amount by the capillary phenomenon of a water-conveying fiber bundle 10 to an underground sunken water-conveying pipe 9 outside a branched water filling pipe 8 that is branched from a flexible water-conveying pipe 5. The conveyed water is permeated to a subterranean formation through a cone-shaped perforated pipe 11 attached to the end part of the underground sunken water-conveying pipe 9, and absorbed by plant roots. The underground sunken water-conveying pipe 9 is suitably sunk into the earth by the human power or gravity in response to the growth of the plant in order to promote the growth of the plant roots.COPYRIGHT: (C)2014,JPO&INPIT【課題】灌漑農地の塩害化を極力防止するとともに、植物根の生育を促進するために灌漑地下深度を可変とするローコストの沈降管内浸み出し灌漑システムを提供することである。【課題を解決するための手段】給水タンク2からの少量の灌漑水は、フレキシブル導水管5から分岐した分岐注水管8外側の地中沈降導水管9内の導水糸束10の毛管現象にて適量導水される。導水は地中沈降導水管9下端部に装着された円錐多孔管11より地下層に浸み出し植物根に吸収される。植物根の生育を促進するために、地中沈降導水管9は植物の生育に応じて地中に適宜人力若しくは重力により沈降される。【選択図】 図1
