Abstract
Wireless sensor network (WSN) is an important tool for large-scale field monitoring. It can acquire field information with various sensor nodes at high temporal and spatial resolution. In this paper, in order to accurately get the soil water deficit and then execute effective and water-saving irrigation, a WSN of soil moisture is established and the remote management platform is developed for data collection, storage, and analysis. The WSN of soil moisture system includes twenty sensor nodes, two sink nodes, and a high resolution web-camera. The sensor nodes are located in a corn field and send the data of soil moisture every 30 minutes to the sink node, which connected to a GPRS module. The GPRS module is used to forward the data to the remote management platform using TCP-IP standard protocol. The platform can be browsed in any computer connected with Internet. The distribution of the sensor nodes and all measured data can be read in the platform, which provides an irrigation prescription according to the measurements of soil moisture. The web-camera is used to monitor the corn field to provide images for precision management of the crop. Through a long-time test in field, it is proved that the whole system is stable and reliable, and can be used to support precision irrigation system.
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