Research of flow adaptive function and structure design for subsurface drip irrigation emitter

According to the application style and technical characteristics in surface irrigation and subsurface irrigation, we analyze the function of flow adaptive for emitter based on understanding the development present situation of subsurface drip irrigation system and emitter. At the theory of soil moisture, we put forward a specific measures about realizing the capacity adaptive function to emitter, that is, a kind of emitter with flow adaptive function for subsurface drip irrigation has been designed. This emitter takes the soil negative pressure as power, the soil moisture as control condition, the actual water requirement of crop as the final control object, and its drip status is controlled by the changes of elastic membrane in it. So the emitter can reflect the change of soil moisture automaticly and realtimely, with obvious function of self-adjusting current capcacity.