PROBLEM TO BE SOLVED: To provide a plant cultivation device which can reduce energy required for the sterilization of a nutritious solution and can efficiently cultivate a plant.SOLUTION: The plant cultivation device is characterized by including a cultivation tank (101) for the nutritious solution cultivation of a plant, and a nutritious solution-supplying part (102) for circulation-supplying the nutritious solution to the cultivation tank (101), wherein the nutritious solution-supplying part (102) has a nutritious solution-sterilizing part (103) the nutritious solution-sterilizing part (103) has a sterilization tank (103B), a discharge unit (103A) for generating streamer discharge in water in the sterilization tank (103B), a direct current power source (103C) for supplying a direct current voltage to the discharge unit (103A), and a heating unit (103D) for heating a nutritive solution in the sterilization tank (103B) the discharge unit (103A) has a discharge electrode (131), an insulated container (133) receiving the discharge electrode (131) and having an opening, and a counter electrode (135) disposed at a position facing the opening.COPYRIGHT: (C)2012,JPO&INPIT【課題】養水の殺菌に要するエネルギーを低減し、効率良く植物を栽培できるようにする。【解決手段】植物栽培装置は、植物を養液栽培するための栽培槽(101)と、栽培槽(101)に養水を循環供給する養水供給部(102)とを備えている。養水供給部(102)は、養水殺菌部(103)を有し、養水殺菌部(103)は、殺菌槽(103B)、殺菌槽(103B)内において水中ストリーマ放電を発生させる放電ユニット(103A)、放電ユニット(103A)に直流電圧を供給する直流電源(103C)及び殺菌槽(103B)内の養水を加温する加温ユニット(103D)を有している。放電ユニット(103A)は、放電電極(131)と、放電電極(131)を収容し、開口を有する絶縁容器(133)と、開口と対向する位置に配置された対向電極(135)とを有している。【選択図】図1
