Evolution of Traditional Chinese "Salt-Leaching and Alkali-Washing" Technology and Strategies for Improving Productive Coastal Saline-Alkali Land Landscapes – A Case Study of Cixi City

“Salt-leaching and alkali-washing” is a traditional Chinese technique for reclaiming saline-alkali land, widely used in China’s eastern coastal regions. This technique uses irrigation and drainage to reduce soil salinity and alkalinity, transforming land originally unsuitable for farming into highly productive farmland. In Cixi City, with the establishment of modern agricultural parks represented by Zhengda Agriculture, this traditional technique has been combined with modern technology to develop a new “salt-leaching and alkali-washing” method. This greatly increased the efficiency of saline land improvement, converting large areas of heavily saline-alkali land into arable land with mild salinity and achieving very high economic returns. This paper reviews the development history of “salt-leaching and alkali-washing” from ancient times to the present and examines its current applications, and also analyzes how “salt-leaching and alkali-washing” shapes the landscape and its potential for future landscape transformation.