PROBLEM TO BE SOLVED: To provide a hydroponic method comprising sterilizing hydroponic nutrient solution with ozone water, making the solution contain a large quantity of oxygen, and supplying the nutrient solution to a water passage for supplying the nutrient solution so as to promote growth of plants and to provide a hydroponic device including a device for supplying the nutrient solution.SOLUTION: The hydroponic method comprises: producing ozone water the ozone concentration of which is maintained at &ge20 PPM for one hour or more while the ozone water is left in atmospheric pressure at 20°C as it is by making the water contain a large quantity of ozone air bubbles each having a diameter of &le30 &mum admixing the ozone water to the hydroponic nutrient solution to perform sterilization and supplying the ozone water-mixed sterilized nutrient solution where the ozone concentration is &le3 PPM and the concentration of remaining oxygen is &ge10 PPM, to the roots of an objective plant 26 through a water passage 28 where the objective plant 26 is placed. The method enables more efficient supply of highly concentrated oxygen to the objective plant than a method comprising bubbling or the like.COPYRIGHT: (C)2012,JPO&INPIT【課題】水耕栽培の養液をオゾン水で殺菌処理して酸素を多量に含ませ、養液を供給する水路に供給して、植物の生育を促進する方法と、その養液の供給装置を提供する。【解決手段】直径30ミクロン以下のオゾン気泡を多量に含ませることにより、大気圧中に摂氏20度で放置してオゾン濃度20PPM以上の状態を1時間以上保持できるオゾン水を製造し、水耕栽培の養液にオゾン水を混合して殺菌処理をし、オゾン水を混入した殺菌処理後の養液であって、オゾン濃度3PPM以下で、残留酸素濃度が10PPM以上のものを、対象植物26を配置した水路28を通じて対象植物26の根に供給する。バブリング等の方法に比べて、高濃度の酸素を効率良く対象植物に供給できる。【選択図】図1
