PROBLEM TO BE SOLVED: To suppress decline of market value of fruits even if the fruits are grown outdoors.SOLUTION: The growth management system for a plant for managing the state of growth of the plant is disclosed. The system includes: a growth condition measuring device 10 for measuring at least one of the temperature, humidity, COconcentration and the amount of sunlight in a planting area for the plant； a spectroscopic measuring device 20 for measuring spectroscopic characteristics of an object to be measured to the light with a green leaf of the plant as the object to be measured； and an intensive management device 30 for intensively managing the result of measurement by the growth condition measuring device 10 and the result of measurement by the spectroscopic measuring device 20, and calculating the optimum amount of irrigation to the plant in association with the respective results of measurement.【課題】果実の市場価値の低下を抑制する。【解決手段】植物の生育状態を管理する植物の生育管理システムが開示されている。当該システムは、前記植物の栽培地における温度、湿度、ＣＯ２濃度および日照量のうち、少なくとも１つを測定する生育条件測定装置１０と、前記植物の緑葉を測定対象物としてその測定対象物の光に対する分光特性を測定する分光測定装置２０と、生育条件測定装置１０による測定結果と分光測定装置２０の測定結果とを集中管理し、これら各測定結果を関連付けて前記植物に対する最適な潅水量を算出する集中管理装置３０と、を備える。【選択図】図８
