PROBLEM TO BE SOLVED: To provide a sterilization method of culture solution (liquid fertilizer) containing nutrient which is used in place of soil in hydroponics, and a device thereof.SOLUTION: A sterilization method of culture solution L in which culture solution L containing nutrient used in hydroponics is circulated by a pump 3, and sterilization is performed in a vessel 2 where ultraviolet lamps U are installed, in which a bottom face of the vessel 2 is formed flat, the culture solution L is allowed to flow so as to crawl along the bottom face, a gap is provided between the surface of the culture solution L and the ultraviolet lamps U in a non-contact state, the vessel 2 is a box type, and formed of stainless steel .SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】水耕栽培にあって、土壌に代えて使用される養分を含ませた培養液（液体肥料）の殺菌方法及びその装置を提供する。【解決手段】水耕栽培に使用される養分を含ませた培養液Ｌをポンプ３で循環させ、紫外線ランプＵを設置した槽２内で殺菌を行なう培養液Ｌの殺菌方法において、槽２は底面をフラットに形成し、培養液Ｌは底面に沿って這わせるように流通させ、培養液Ｌの表面を紫外線ランプＵとは非接触状態に間隔を設けてあることとし、槽２はボックス型とし、ステンレスで成形されていることとする。【選択図】図１
