Design of Self-adaptive Emitter of Subsurface Drip Irrigation

Aiming at the subsurface drip irrigation technology,which is the most water-saving and the highest efficient water-using irrigation technology,the structure,use characteristic and functions of current subsurface emitter are analyzed in this paper.And using the soil water theory in soil-water system,a type of non-electronic controlled subsurface emitter is designed.This product takes the soil negative pressure as control power,the soil moisture as control condition.When the soil moisture around the emitter changes,the soil will show different negative pressure,which affects and deforms the elastic membrane in the inner of emitter to change the open or close condition of its interior flow passage.So the flow condition of the emitter can automatically adapted to the soil moisture and the emitter has the function of self-adjusting flow capacity.