PROBLEM TO BE SOLVED: To provide a closed-system nutrient liquid cultivation method of plants in which accumulation of growth inhibition substance exuded from roots of a plant can be suppressed, and an electrolyzer for nutrient liquid cultivation, in which temperature rise of culture solution can be suppressed, and a problem that nutrient is crystallized on an electrode side and nutrient required for growth becomes short can be prevented.SOLUTION: In a nutrient liquid cultivation method in which concentration of growth inhibition substance, which exuded from a plant to be cultivated into culture solution, in the culture solution is reduced by electrolysis which is performed by applying voltage to a pair of electrodes 8, voltage to be applied to the pair of electrodes 8 is AC voltage.SELECTED DRAWING: Figure 1【課題】植物の根から滲出される成長阻害物質の蓄積を抑制できる閉鎖系の養液栽培方法において、培養液の温度上昇を抑制できるとともに、電極側に栄養分が析出して生長に必要な栄養分が不足することを防止できる植物の養液栽培方法及び養液栽培用の電気分解装置を提供することを課題とする。【解決手段】栽培対象の植物から培養液中に滲出した成長阻害物質の該培養液中の濃度を、一対の電極８に電圧を印加して行う電気分解によって、低減させる養液栽培方法において、前記一対の電極８に印加する電圧を交流電圧とした。【選択図】図１
