OZONE SUPPLY CONTROL METHOD, ADDITIONAL FERTILIZATION AMOUNT CONTROL METHOD AND NUTRITIOUS LIQUID CULTIVATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a method for ozone sterilization of the nutritious liquid suppressing precipitation of minor elements in solution while maintaining a bactericidal effect, a method of an additional fertilization which replenishes the precipitated minor elements, and a nutritious liquid cultivation device using the same.;SOLUTION: An ozone supply control method measures an oxidation reduction potential value of nutritious liquid and stops ozone supply when confirming shift to a state that the oxidation reduction potential value of the nutritious liquid is an approximately constant value after the oxidation reduction potential value of the nutritious liquid reaches a peak and then decreases. An additional fertilization amount control method acquires ozone supply amount by multiplying ozone concentration supplied to the nutritious liquid by the supply time thereof, acquires minor element amount precipitated from the nutritious liquid in accompany with the ozone supply on the basis of a pre-obtained correlation between the ozone supply amount and the precipitation amount of the minor elements, and replenishes the minor elements amount of which is the same as that of the precipitation of the minor elements to the nutritious liquid tank.;SELECTED DRAWING: Figure 7;COPYRIGHT: (C)2018,JPO&INPIT