WANG Kunqi;ZHAO Qian;JIA Dongdong;GUO Wenzhong;JIA Haiyao;WANG Chenjian;Mechanical and Electrical Engineering Institute,Xi′an Technological University;Beijing Research Center of Intelligent Equipment for Agriculture;

single fertilizer;;integrated water and fertilizer;;Programmable Logic Controller(PLC);;PID control principle

Promoting integrated irrigation technology of water and fertilizer in the Northwest China is important.But considering the problems about the low level of infrastructure construction and the shortage of specialized talents,the integrated water and fertilization irrigation system of single channel was developed in this study,as well as a control schedule about water and fertilizer coupling,which embedded irrigation strategy based on soil moisture and cumulative radiation.The system was composed of dope bucket,irrigation head and control unit.For the hardware,Programmable Logic Controller(PLC)and multiple knobs on the panel were used to realize multi-level coupling supply of water and fertilizer.For the software,on one side,the comprehensive control method based on dualfactor conditional activation and water sensor was used to realize automatic irrigation;on the other side,adjusted EC value of irrigation solution applying PID principle.The system can work in manual mode or in automatic mode,eliminating the local upper computer and the cumbersome touch setting process.Compared with traditional fertilizer applicators,the robustness of the system was higher due to avoidance of fault events of the touch screen in greenhouse with a high temperature and high humidity environment.Meanwhile,the configured automatic irrigation method replaced the traditional irrigation mode of excessive water and fertilizer with a small number of water-fertilizer coupling supply mode,with an effect of liberating the labor force,reducing water leakage,and increasing water use efficiency.To sum up,in the actual promotion,the system was easy to install,functional and practical,and were suitable for plastic cultivation,solar greenhouses and other cost-effective soil cultivation,in line with the current needs of the development of traditional agriculture.