Precision irrigation system based on detection of crop water stress with acoustic emission technique

A computerized and automatic precision irrigation system based on estimation of crops water stress with acoustic emission (AE) technique was developed in the modern greenhouse. The system can automatically acquire the real-time AE signals and transpiration data from tomato crop respectively with AE sensor and electronic balance, The system also can automatically obtain environment parameters of the greenhouse, such as temperature, air humidity, the density of the sunlight and CO₂ density, and then according to an optimum control algorithm, the system automatically carried out precision irrigation. The experiment results have shown that AE events increase gradually with the increase of transpiration speed of crops to some extent. The system has the potential to implement optimum and automatic irrigation based on the information acquired from the crops with acoustic emission, but the system is easily to be affected by noise of environment.