[PROBLEMS] To provide a hydroponic cultivation system capable of preventing continuous cropping failure during hydroponic cultivation. In a hydroponic cultivation system comprising a hydroponic cultivation facility 1 having a cultivation floor 11 for cultivating a plant 10 and performing hydroponic cultivation in the presence of cultivation water contained in the cultivation floor 11, the cultivation water is Contains a redox substance derived from a living body that is converted into an oxidant and a reductant by an applied potential, and preferably the redox substance appears when electrodepositing on a detection electrode on a detection curve measured by voltammetry. A hydroponic cultivation system characterized in that at least one of a current peak that appears and a current peak that appears upon elution appears. [Selection] Figure 1【課題】水耕栽培する際に、連作障害を防止できる水耕栽培システムの提供。【解決手段】植物１０を栽培する栽培床１１を有する水耕栽培施設１を備え、前記栽培床１１に含まれる栽培水の存在下で水耕栽培を行う水耕栽培システムにおいて、前記栽培水が、印加される電位によって酸化体と還元体に変換する生物由来の酸化還元性物質を含有し、好ましくは、該酸化還元性物質はボルタンメトリーにより計測した検出曲線に検出極に電着する際に出現する電流ピークと溶出する際に出現する電流ピークの少なくとも一方が現れる物質であることを特徴とする水耕栽培システム。【選択図】 図１
