| 摘要 |
PURPOSE:To simplify mixing of cultivation nutrient solutions by supplying several kinds of minor element fertilizer solutions to nutrient solution tanks of the two main nutrient solutions and feeding the nutrient solutions from both the nutrient solution tanks into a nutrient solution mixing tank. CONSTITUTION:A nutrient solution tank (A) for housing a main nutrient solution (a) is connected through control valves (8a) to (11a) to minor element housing tanks 8 to 11 and a nutrient solution tank (B) for housing a main nutrient solution (b) is connected through control valves (12a) to (14a) to minor element housing tanks 12 to 14. The minor element fertilizers in the tanks 8 to 14 are diluted to cultivation concentrations suitable for the concentrations of the solution (a) or (b) and housed therein. The control valves (8a) to (14a) are controlled by control of a computer 1 according to sensing of conditions of the nutrient solution ingredients in a nutrient solution mixing tank (C). |
