Abstract: A set of water fertilizer integrated irrigation controller with high stability, simple operation, low cost and sufficient function was studied and designed. The system used sensor technology, micro-computer technology, PLC as the core, and drip irrigation technology, according to the soil humidity and the required fertilizer and water threshold in the process of crop growth, to carry out automatic irrigation and fertilization. The results showed that the system could effectively improve the productivity of facility agriculture and the efficiency of fertilizer and water use, save the amount of water resources, and provide some technical support for small and medium-sized facility agriculture farmers in western region.

Key words: PLC, agriculture, water and fertilizer integration, irrigation, control