The present invention relates to a circulation type water culture system, which comprises a setting means for setting a watering period and nutrient solution parameters a first memory device for storing the nutrient solution supply amount data and EC value data calculated by the set watering period and the nutrient solution parameters a first EC measuring device for measuring the EC value of the drainage discharged from a culture bed a second memory device for storing the EC value measured by the first EC measuring device a nutrient solution mixing tank for mixing a nutrient solution necessary for the plant cultured in the culture bed, and storing the mixed nutrient solution a source water supply tank for supplying source water to the mixing tank a drainage collection tank for collecting the drainage discharged from the culture bed a drainage storage tank for storing the drainage transferred from the drainage collection tank, and supplying the drainage to the nutrient solution mixing tank a concentrated nutrient solution storage tank for supplying a concentrated nutrient solution to the mixing tank and a central control device for calculating the quantity of the drainage to be supplied to the nutrient solution mixing tank from the drainage storage tank, the quantity of the source water to be supplied to the nutrient solution mixing tank from the source water tank, and the quantity of the concentrated nutrient solution to be supplied to the nutrient solution mixing tank from the concentrated nutrient solution storage tank on the basis of the supply amount data and EC value data stored in the first memory device, and the EC value stored in the second memory device.COPYRIGHT KIPO 2015본 발명은 순환식 수경재배시스템에 관한 것으로, 관수 주기와 양액 파라메터를 설정하기 위한 설정수단과 설정된 상기 관수 주기와 상기 양액 파라메터에 의해 연산된 상기 양액 공급량 데이터 및 EC 값 데이터를 저장하는 제1 메모리 장치와 재배 베드로부터 배출되는 배액의 EC값을 측정하는 제1 EC 측정기와 상기 제1 EC 측정기에 의해 측정된 EC값을 저장하는 제2 메모리 장치와 상기 재배 베드에서 생육되는 작물에 필요한 양액을 혼합하고, 상기 혼합된 양액을 보관하는 양액 혼합탱크와 상기 혼합탱크에 원수를 공급하는
