我国是一个水资源严重短缺的农业大国,大力推广节水型农业是我国农业发展的必然趋势,节水灌溉是节水农业的核心,它是通过采用先进的灌溉方法和技术将水源尽可能均匀、适度的分配到作物根区土壤中,使土壤经常保持适宜于作物生长的水分、通气和营养状况;从而达到提高灌溉水利用效率和水产出 China is a large agricultural country with a serious shortage of water resources. To promote water-saving agriculture vigorously is an inevitable trend of agricultural development in our country. Water-saving irrigation is the core of water-saving agriculture. It uses the advanced irrigation methods and technologies to make the water as uniform as possible , The appropriate distribution to the crop root zone soil, so that the soil often maintain suitable for crop growth of moisture, ventilation and nutritional status; so as to achieve the improvement of irrigation water use efficiency and aquatic products