THE DESIGN OF PRECISION IRRIGATION SYSTEM BASED ON WIRELSS SENSOR NETWORK AND FUZZY CONTROL

摘要

Precision irrigation is an important practice in water-saving agriculture cropping system which allows producers to maximize their productivity while saving water. And the major concerns are precisely determining the crop water requirement and the proper strategy of irrigation, and reach real-time and automatic irrigation with proper quantities of water and in place of need. Taking these concerns into consideration, a precision irrigation system based on wireless sensor networks (WSN) and fuzzy control technology was designed in this paper. The ZigBee-WSN was used to transmit the irrigation control signal, the soil water potential signal and micrometeorological information including air temperature, relative humidity, solar radiation, wind velocity and so on. The soil water potential and crop evapotranspiration calculated using the FAO56 Penman-Monteith equation were taken as input variables of fuzzy controller, and the multiple-factor control rule database was established for the fuzzy irrigation control system. The test results show that the system has many advantages, such as economic, practical, with high communication reliability and control accuracy. Especially, this system is quite appropriate for medium and small-sized precision irrigation area.