PROBLEM TO BE SOLVED: To provide a hydroponic apparatus capable of improving environmental condition according to a state of plants.SOLUTION: A hydroponic apparatus comprises: a tank 3 which stores nutritious liquid F a cultivation tank 2 which holds a plant P inside thereof and gives the nutritious liquid F to roots Q of the plant P a circulation part 5 which circulates the nutritious liquid F stored in the tank 3 via the cultivation tank 2 a detection part 6 which detects physical quantity regarding the nutritious liquid F a determination part 74 which determines growth stage of the plant P based on changes of the physical quantity detected by the detection part 6 and an environment changing part 75 which changes at least one environmental condition out of temperature, humidity, carbon dioxide concentration, oxygen concentration, illuminance, and wind speed of the cultivation tank 2, pH and temperature of the nutritious liquid F, and concentration of nutrients based on the growth stage determined by the determination part 74.COPYRIGHT: (C)2015,JPO&INPIT【課題】植物の状態に応じて環境条件を向上できる水耕栽培装置を提供する。【解決手段】水耕栽培装置は、養液Fを溜めるタンク3と、内部に植物Pを保持し、養液Fを植物Pの根Qに与える栽培槽2と、タンク3に溜められた養液Fを、栽培槽2を介して循環させる循環部5と、養液Fに関する物理量を検出する検出部6と、検出部6が検出する物理量の変化に基づいて、植物Pの生育段階を判断する判断部74と、判断部74が判断した生育段階に基づいて、栽培槽2の温度、湿度、二酸化炭素濃度、酸素濃度、照度、風速、養液FのpH、温度、養分の濃度のうち、少なくとも一つの環境条件を変更する環境変更部75とを備える。【選択図】図1
