随着我国水资源供需矛盾的日益尖锐和水资源环境的日趋恶化,节水已成为我国解决水问题的有效途径之一。而农业灌溉用水是我国用水的第一大户,其用水量占全国 With the increasingly sharp contradiction between supply and demand of water resources in our country and the deteriorating water resource environment, water saving has become one of the effective ways to solve the water problem in our country. The agricultural irrigation water is the largest user of water in China, its water consumption accounts for the country