<；P>；PROBLEM TO BE SOLVED: To provide a plant growth unit enabling supply of plant growth liquid in which carbon dioxide or oxygen gas is dissolved at a prescribed concentration, without using costly permeable film. <；P>；SOLUTION: The plant growing device includes: a plant growth liquid-storing tank； a water supply device supplying a prescribed amount of water into the plant growth liquid-storing tank； a circulation pipe on which a pump circulating the water or the plant growth liquid in the plant growth liquid-storing tank is mounted； a gas-dissolving mixer mounted on the circulation pipe and dissolving gas supplied from a carbon dioxide gas cylinder or an oxygen gas cylinder into the liquid flowing through the circulation pipe； a pH indicator detecting and displaying pH of the liquid in the plant growth liquid-storing tank； and a plant growth liquid-supplying device mounted on the circulation pipe downstream of the pump and spraying the plant growth liquid in the plant growth liquid-storing tank to the plant cultivation space or supplying the liquid to the root part of the plant when the liquid is brought into a prescribed condition. <；P>；COPYRIGHT: (C)2010,JPO&INPIT
