The present invention, hydroponic nutrient solution control method, (a) estimating the amount of production in the estimating amount estimating module 110, the amount of nutrient solution to be supplied to the medium from the estimated estimating amount is determined by a predetermined method (S100)； (b) supplying a nutrient solution to the medium in the feed module 120, the step of measuring the total ionic concentration (Electrical Conductivity, EC) of the nutrient solution supplied to the medium (S110)； (c) in the drainage module 130, discharging the nutrient solution from the medium, and measuring the total ion concentration of the drainage discharged from the medium (S120)； And (d) in the control module 140, the ratio of the total ion concentration (EC) of the discharged liquid compared to the supplied nutrient solution is calculated, and according to the ratio of the total ion concentration (EC), the supply module 120 is controlled. Controlling the total ion concentration (EC) and the amount of liquid supply of the nutrient solution to be supplied (S130)； In the (d) step (S130), the control module 140, if the total ion concentration (EC) ratio is a predetermined range, primarily increases the amount of the nutrient solution, the total ion Provided is a method for controlling a hydroponically cultured nutrient solution, in which the total ion concentration of a nutrient solution supplied to the medium is lowered when the concentration (EC) ratio is outside the predetermined range.본 발명은, 수경재배 양액 제어 방법으로서, (a) 증산량 추정 모듈(110)에서 증산량을 추정하고, 추정된 상기 증산량으로부터 배지에 공급할 양액의 급액량이 미리 설정된 방법에 의해 결정되는 단계(S100)； (b) 급액 모듈(120)에서, 배지에 양액을 공급하며, 상기 배지에 공급되는 양액의 전이온농도(Electrical Conductivity, EC)가 측정되는 단계(S110)； (c) 배액 모듈(130)에서, 상기 배지로부터 양액을 배출시키며, 상기 배지로부터 배출되는 배액의 전이온농도가 측정되는 단계(S120)； 및 (d) 제어 모듈(140)에서, 상기 공급하는 양액 대비 배출되는 배액의 전이온농도(EC) 비율이 연산되며, 상기 전이온농도(EC) 비율에 따라, 상기 급액 모듈(120)을 제어하여 상기 공급하는 양액의 전이온농도(EC) 및 급액량을 제어하는 단계(S130)； 를 포함하며, 상기 (d) 단계(S130)에서, 상기 제어 모듈(140)은, 상기 전
