| 摘要 |
PURPOSE:To prevent useless consumption of culture solution and to enable effective growth of a plant by controlling various ion concentrations, electrical conductivity and pH of the culture solution to respective optimum levels. CONSTITUTION:A culture solution 8 in a tank 5 is pumped and supplied to a culture panel 7 while measuring various ion concentrations, electrical conductivity and pH of the culture solution by an ion analyzer 10, a pH meter 11 and an electrical conductivity meter 12. Various acid solutions and various alkali solutions are pumped from an acid and alkali supplying part 3 according to the measured result and the acid or alkali solutions are supplied to the culture solution 8 or various liquid fertilizers are pumped from a liquid fertilizer feeding part and supplied to the culture solution 8 or the culture solution 8 is diluted with water by opening a solenoid valve 18 to control various ion concentrations, electrical conductivity and pH of the culture solution to respective optimum levels. |
