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An Automatic Irrigation Control System for Soilless Culture of Lettuce
- Liu, Zhigang, Xu, Qinchao
- Water 2018 v.10 no.11
- computer software, developmental stages, drainage, evapotranspiration, irrigation management, irrigation water, lettuce, models, rhizosphere, soilless culture, spring, summer, water conservation, water content, water use efficiency
- To achieve precise measurement of moisture content in the substrate and intelligent water-saving irrigation, a simple and low cost automatic irrigation control system based on ZigBee wireless network has been developed. A software with irrigation strategy was proposed based on the models of substrate wetting pattern, lettuce root zone and the evapotranspiration. The system could detect substrate moisture in real-time and irrigate automatically according to the threshold of substrate and the irrigation strategy. The average fresh weight per plant under intelligent irrigation are 16.60% and 11.37% higher than manual control irrigation at least in different growth stages in spring and summer, the average drainage rate of intelligent irrigation is 16.08% and 17.06% smaller than manual control irrigation in spring and summer, and the irrigation water use efficiency of intelligent irrigation is 68.03% and 98.61% higher than manual control irrigation in spring and summer. The results show that the system is a promising tool for scientific and rational irrigation decision.