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Abstract. A farmland precision auto-irrigation system based on wireless network is proposed to improve the using efficiency of irrigation water. The system consisting by host computer, soil moisture sensor, wireless network, ZigBee module, and valve controller. The system makes its own network based on ZigBee protocol. Monitor center and wireless gateway base on GPRS for information transmission and control. System control core is a single-chip microcomputer, composed by wireless sensor nodes, routing nodes, and change of wireless gateway real-time monitoring soil moisture, also irrigate the soil precisely according to the soil water content and the rule of irrigation water. The system realized the automatic water-saving irrigation control, improved the utilization of water resources in agriculture irrigation and irrigation automation. The results experiment show that, the system‘s flexibility is well. When soil moisture is high or the factors in sensor nodes are damaged, other parts of the system can continually work, also having self-organizing restore function. The monitoring center can display soil moisture and on/off situation of the valve parameters in each node in real-time. It realizs the remote monitoring of water saving irrigation.

Preface. With the development of electronic technology and the shortage of water resources, irrigation automatic control technology has a constant progress, but data acquisition is always the core problem of irrigation control system [1-2]. Foreign countries had an early start in the irrigation control with highly automated irrigation control system. China has made great progress in some aspects of farmland soil moisture monitoring. However, there is still a huge backward when comparing with foreign countries since the late start and old equipment. Therefore, a system with fast, accurate, real-time field information collection, real-time monitoring is imperative to realize precise irrigation. Precise irrigation is a part of water management. It is mainly about making irrigation by crop demand. Precise irrigation system managed irrigation by using modern sensor technology for acquisition environment and water information of crop and automated irrigation control device.