CULTURE MEDIUM SUPPLYING APPARATUS AND CULTURE MEDIUM PREPARING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a culture medium supplying apparatus and a culture medium preparing method, which can accurately correct the mixing amount of a liquid fertilizer and improve the accuracy of adjusting the characteristics of the culture medium.SOLUTION: The culture fluid supply device 1 of the present invention comprises: a solenoid valve 43 in a liquid fertilizer supply pipe 42; a liquid fertilizer supply pipe 44 disposed between the solenoid valve 43 and a liquid fertilizer tank 41; and a liquid fertilizing return pipe 45 that connects the liquid fertilizing tank 41 to a middle pipe portion 42a located between the solenoid valve 43 and the liquid fertilizer supply pump 44. During the fertilization time of the culture medium to a plant, therefore, driving of the liquid fertilizer supply pump 44 can be continued at either timing of opening and closing the electromagnetic valve. Immediately after the solenoid valve 43 switches from the closed state to the open state, the liquid fertilizer flows toward the culture solution tank 10. There is no time lag in supplying liquid fertilizer toward the culture solution tank 10. Thus, the amount of liquid fertilizer can be precisely controlled.SELECTED DRAWING: Figure 1