Abstract
We have studied CO2 fixation from air. Photosynthesis performed in plants might be the superior process for the fixation of diluted CO2. The following four factors should be considered for the fixation; (1) high efficiency per unit area, (2) growth control by hydroponics, (3) easy circulation and (4) proper preservability of the products. Onions have been picked for the most favorable plants. They have been grown for 3 months in a CO2 rich chamber. The rate of the photosynthesis has been raised over twice in the CO2 concentration of 3,000 ppm compared with ca. 400 ppm in air.
