PROBLEM TO BE SOLVED: To provide an automatic water supply system capable of efficiently carrying out a water supply control in a state close to a natural state as much as possible corresponding to the state of a plant and cultivating a strong plant.SOLUTION: This automatic water supply system is equipped with a water supply means capable of supplying water to a target of water supply and a control means provided with two or more kinds of modes different in at least water supply starting conditions and controlling water supply performance and water supply suspension by the water supply means corresponding to the mode and changes the modes corresponding to a fixed change condition. A first mode for judging the presence of a fixed water amount based on the detected value of a water state detection part by a sensor and, in the case of judgment of absence of the fixed water amount and performing water supply, a second mode for judging the presence of a fixed water amount based on the detected value of a water state detection part by the sensor and, in the case of judgment of absence of the fixed water amount, starting the measurement of a fixed stress time by a timer part and performing water supply after termination of the measurement of the stress time, etc., are set as the modes.COPYRIGHT: (C)2002,JPO【課題】 植物の状態に応じて、効率的に且つできるだけ自然に近い状態にして給水管理を行うことが可能であり、丈夫な植物を栽培することができる自動給水システムを提供する。【解決手段】 給水対象に給水可能な給水手段と、少なくとも給水開始条件の異なる複数種類のモードが設定され、該モードに応じて該給水手段による給水実行及び給水停止を制御する制御手段とを備え、該モードが所定の切替条件に応じて切り替わる自動給水システム。前記モードとしては、センサーによる水分状態検出箇所の検出値に基づき所要水分量の有無を判定し、所要水分量無しと判定した場合に給水を実行させる第1モード、センサーによる水分状態検出箇所の検出値に基づき所要水分量の有無を判定し、所要水分量無しと判定した場合にタイマー部による所定のストレス時間の計測を開始し、該ストレス時間の計測が終了した後に給水を実行させる第2モード等を設定する。
