PLANT CULTIVATION SYSTEM AND PLANT CULTIVATION METHOD

To suppress proliferation of algae to suppress multiplication of bacteria in nutritious liquid.SOLUTION: A plant cultivation system 1 has: a cultivation vessel 21 which allows nutritious liquid 61 to pass and cultivates plants 3; a storage tank 43 storing the nutritious liquid 61; a first drainage channel 45 which is connected to the cultivation vessel 21, overflows the nutritious liquid 61 at a predetermined water level to drain the liquid from the cultivation vessel 21 to the storage tank 43; a second drainage channel 47 which is connected to the vicinity of a bottom part of the cultivation vessel 21, and drains the nutritious liquid 61 from the cultivation vessel 21; a drain valve 49 which opens/closes the second drainage channel 47; a sterilizer 53 which is provided at a water supply channel 55 of the nutritious liquid 61, and performs a sterilization treatment on the nutritious liquid 61 drained from the cultivation vessel 21; and a water supply channel 55 which supplies the nutritious liquid 61 on which sterilization treatment has been performed to the cultivation vessel 21.SELECTED DRAWING: Figure 7 【課題】藻類の繁殖を抑制することで養液中の細菌の増殖を抑制する。【解決手段】植物栽培システム１は、養液６１を通水して植物３を栽培する栽培槽２１と、養液６１を貯留する貯留槽４３と、栽培槽２１に接続され、養液６１を所定の水位で越流させて栽培槽２１から貯留槽４３に排水する第１排水路４５と、栽培槽２１の底部近傍に接続され、養液６１を栽培槽２１から排水する第２排水路４７と、第２排水路４７を開閉する排水弁４９と、養液６１の給水路５５に設けられ、栽培槽２１から排水された養液６１に殺菌処理を行う殺菌装置５３と、殺菌処理が行われた養液６１を栽培槽２１に給水する給水路５５と、を有する。【選択図】図７