As a method for automatically controlling the irrigation of potted challenge, a change in weather and humidity, to provide solutions to problems that harm the plant without match the changes in soil moisture. This improves the structure of a sensor detecting the moisture SOLUTION: A soil 3, by eliminating the harmful effects electrolysis phenomena in soil. 3 by suppressing the electric current of 7 between the sensor electrodes, the moisture changes in soil 3 which depends on the irrigation enables automatic control of detecting in a timely manner, corresponding to the change in moisture in the 3 soil brine, thereby reducing costs omitted detection sensor of moisture excess water from leaking out of the growing container 2 depending on the irrigation we plan, and the like surrounded by absorbent insulating material 7b of the sensor electrode to prevent erroneous determination short of 7 between the sensor electrodes by capillary roots of the plant 1, further water source without using a water pipe, the water storage tank 11 to water supply as possible. [Selection] Figure Figure 1【課題】鉢植えの潅水を自動制御する方法として、天候や湿度の変化で、土壌水分の変化とマッチせず植物に害を与える問題の解決方法を提供する。【解決手段】土壌3中の水分を検出するセンサーの構造を改善し、センサー電極7間の通電電流を抑えて土壌3中での電解現象による弊害を無くし、潅水に依る土壌3中の水分変化をタイムリーに検出して、潅水と土壌3中の水分変化に対応する自動制御を可能にし、それにより、潅水に依って過剰水が栽培容器2から漏出する水分の検出センサーを省略しコスト低減を図ると共に、植物1の毛細根によるセンサー電極7間のショートで誤判定を防ぐ為に前記センサー電極を吸水絶縁材7bで囲む様にし、更に、水源は水道管を用いず、貯水タンク11から給水出来る様にする。【選択図】図1
