淤灌

yū guàn shì zhōng guó nóng tián shuǐ lì fā zhǎn shǐ shang de dì yī gè zhòng yào jiē duàn

淤灌是中国农田水利发展史上的第一个重要阶段。

Warping irrigation is the first important stage in the history of China's farmland water conservancy