| 摘要 |
PURPOSE:To enable accurate control of the concentration of culture liquid and the concentration of an acid or alkali, by extracting a part of a culture liquid supplied from a culture liquid tank to a culture bed and measuring the concentration of the culture liquid and the concentration of acid or alkali in the liquid. CONSTITUTION:A culture liquid for hydroponic culture is circulated between a culture bed 27 and a culture liquid tank 1. In the above hydroponic culture apparatus, a part of the culture liquid supplied from the culture tank 1 to the culture bed 27 is extracted and the concentration of culture liquid and the concentration of an acid or alkali in the culture liquid are measured by sensors 23, 24. |
