PROBLEM TO BE SOLVED: To perform a growth management of plants by which watering at appropriate timing and amount is made possible according to a track in which a plant opens stomata to perform transpiration.SOLUTION: A growth management system 10 is constituted of a COconcentration measuring part 20 provided for a greenhouse 12, a COfeeding device 64, a watering device 66, and a control device 30. In the control device 30, various kinds of arithmetic processing are performed by a control part 32. One day is sectioned into a plurality of steps by using an input part 34, their switching time and COconcentration are set, and stored into a memory 38. The control part 32 compares COmeasured concentration measured by the COconcentration measuring part 20 with COset concentration, and controls drive of the COfeeding device 64 such that the inside of the greenhouse 12 maintains the COset concentration. Further, when an integrated value of drive time of the COfeeding device 64 reaches a predetermined threshold value, watering is instructed to the watering device 66, and a drive time integrated value 40C is reset.SELECTED DRAWING: Figure 1【課題】植物が気孔を開けて蒸散を行った形跡に応じて、適切なタイミング及び量での灌水が可能な植物の生育管理を行う。【解決手段】生育管理システム１０は、ハウス１２に設けられたＣＯ２濃度測定部２０，ＣＯ２供給装置６４，灌水装置６６と、制御装置３０により構成される。制御装置３０では、制御部３２によって各種演算処理が行われる。入力部３４を用いて一日を複数のステップに区切り、その切替時刻とＣＯ２濃度を設定し、メモリ３８に記憶する。制御部３２は、前記ＣＯ２濃度測定部２０によって測定されたＣＯ２測定濃度と、ＣＯ２設定濃度を比較し、ハウス１２内が、前記ＣＯ２設定濃度を保つように、前記ＣＯ２供給装置６４の駆動を制御する。また、該ＣＯ２供給装置６４の駆動時間の積算値が所定の閾値に達したら灌水装置６６に灌水指示を行うとともに、駆動時間積算値４０Ｃをリセットする。【選択図】図１
