Timely and moderate automatic irrigation based on the water requirement level of rice is a water-saving and energy-efficient way to increase the yield and improve the quality of rice. But water requirement level varies during the different period of rice growth and this makes it very difficult to implement automatic irrigation in rice field. This study took the field humidity and water requirement level obtained by using humidity sensor and stylus respectively as the automatic irrigation index, humidity and the change rate as inputs and the irrigation time as output to build a fuzzy control system. This system uses pump as control unit to achieve automatic irrigation. Simulation irrigations and pilot study show that the control process of the system is stable. Compared with artificial irrigation, this system can save water by 10％. The research work can provide a reference for timely, moderate and automatic irrigation of rice.%根据水稻需水规律实施适时适量的自动灌溉是节水节能、提高水稻产量和质量的重要方式,但水稻生长过程需要水层,使得水稻的自动灌溉实施非常困难.针对这一问题,该文通过水分传感器、测针分别获取田间含水率和水层深度作为水稻自动灌溉指标:并以田间含水率(或水层深度)及其变化率作为输入,灌溉时间为输出,建立模糊控制系统;驱动农用抽水泵,实现自动灌溉.仿真结果和初步试验表明系统自动控制过程稳定,与人工控制相比,在水稻分蘖期可节约水资源约10%,为水稻的适时适量自动灌溉提供了思路.
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