The present invention relates to a nutrient solution supply system for watering during a tropical night. The nutrient solution supply system comprises: a raw water tank (10) a mixing tank (30) which is provided with raw water from the raw water tank (10) and nutrient solutions from multiple nutrient solution tanks (20) in order to be mixed and multiple watering electronic valves (40) which perform watering of the nutrient liquid mixed in the mixing tank (30) through a watering pipe. The raw water of the raw water tank (10) is fed in the raw water tank (10) from an underground tubular well through a raw water suctioning pump and a filter in order to be passed through a water supply pump (54) and fed into a mixing tank (30). By means of the watering functions of a watering pump (60), acoustic pressure is generated inside each venturi (94) connected between the mixing tank (30) and a branched watering pipe branched from the watering pipe. By means of acoustic pressure, the nutrient solutions in the nutrient solution tank (20) are actively suctioned into the mixing tank (30). When a surrounding environment of fruit trees is under a tropical night, the nutrient solutions mixed in the mixing tank are supplied to the fruit trees by means of signals. In the present invention, nutrient solutions for liquefied fertilizers can be simply and conveniently selected and mixed, so that watering can be performed after a watering amount is adjusted. In addition, the productivity of plants is remarkably improved.COPYRIGHT KIPO 2014본발명은 열대야 관수용 양액공급시스템에 관한 것으로, 원수탱크(10)와, 상기 원수탱크(10)의 원수 및 다수 개의 양액탱크(20)에서 양액이 공급되어 혼합되는 믹싱탱크(30)와, 상기 믹싱탱크(30)에서 혼합된 양액이 관수관을 통하여 관수되는 다수 개의 관수용 전자밸브(40)로 이루어지는 열대야 관수용 양액공급시스템에 있어서,상기 원수탱크(10)의 원수는 지하관정으로부터 원수흡입펌프와 여과기를 거쳐 원수탱크(10) 내부로 인입된 후, 급수펌프(54)를 통과하여 믹싱탱크(30) 내부로 인입되며, 관수펌프(60)의 관수작용에 의해 관수관에서 분기된 분기관수관과 믹싱탱크(30) 사이에 연결된 각각의 벤츄리(94) 내부에는 음압이 발생하고, 상기 음압에 의해 양액탱크(20) 내부의 양액이 믹싱탱크(30) 내부로 원활하게 흡입되는 것이며, 과실나무 주위환경이 열대야일때 제어반의 신호에 의해 믹싱탱크에서 혼합된 양액이 과실나
