Study And Development On The Irrigating Control System Of Nutrient Liquid In Green House

The technology of soilless culture is a new kind of agricultural technology that can culture crops without soil but by nutrient liquid in green house. It is a great innovation in human plant method. It has developed quickly around the world because of its high-speed grow, good harvest and high quality. With development and synthetic application of modern agriculture, computer and environment control, it has grown up an agriculture technical system . Its development can bring important renovation to agriculture technical content and effect of production. In our country the soilless culture technology starts recently, so it is in underway and experimental phrase now. To fit the situation of our country we should develop the technology with easy operation, cheap cost and good effect. Mix nutrient needs specific control equipment that almost introduced from overseas machine. Therefore this paper has studied the system of nutrient liquid mix and irrigation for the purpose of replacement of overseas machine.This paper is study of irrigate control system of soilless culture nutrient liquid in green house. The main adjusting parameters of control system about control system nutrient liquid are consistence and acid. The system, which is a kind of close control system about control system, includes switching circuit, analogue input and output circuit, digital integrated circuit, keyboard display circuit, driving circuit, execution mechanism etc. It achieves the automation adjustment of nutrient liquid and irrigation by modular design method.the adjusting and controlling the values of electrical conductivity, pH and temperature of nutrient solution decided the yield and quality of vegetables in the same condition. The paper studies the theory that how to improve the precision of the measure circuit .The temperature compensation of conductivity by soft is also studied in this paper. The keyboard and display module consists of T6963C controller, LCD(Liquid Crystal Display) and keyboard, which make operation easily . Users can real time setting and modifying every parameters in the machine by keyboard, and single chip microcomputer control the work of this system by setted parameters, and parameters can be displayed on LCD.The result of measure circuit stability test and coupling test suggests that the control system can reach the request of precision and finish control command of automatic mixing and irrigation.