PROBLEM TO BE SOLVED: To reduce using quantity of fed nutrient solution and water in a plant cultivating device.SOLUTION: The plant cultivating device has a controller having a mist supplying unit spraying the nutrient solution as the mist having an average particle size of 10 μm or less in a measured value by a laser method into a hollow cultivating box into which root parts of the cultivated plants hang down and substantially filling the inside of the cultivating box with the same and setting spraying mist quantity and supplying the same such that a humidity in the cultivating box becomes a near saturated condition according to the volume of the cultivating box based on the data preliminarily measuring the mist spraying quantity and flowing speed of the mist, the volume of the cultivating box, the humidity in the cultivating box.COPYRIGHT: (C)2013,JPO&INPIT【課題】植物栽培装置において、供給する養液や水の使用量を低減する。【解決手段】栽培植物の根部が下垂する中空の栽培ボックス内に、養液をレーザー法での測定値で平均粒子径１０μｍ以下の霧として噴霧すると共に該栽培ボックス内に略均等に充満させる霧供給手段を備え、前記霧の噴霧量および流速と、前記栽培ボックスの容積と、前記栽培ボックス内の湿度との相関関係を予め測定したデータに基づいて、前記栽培ボックスの容積に応じて該栽培ボックス内の湿度を近飽和状態となるように霧噴霧量を設定し供給する制御装置を備えている。【選択図】図１
