国內外一般改良鹽碱土的措施是在排水或不排水条件下进行灌溉冲洗,使土壤脫鹽,然后,通过适当农业技术措施提高土壤肥力,并保証农作物的生長。科学研究与生产实践証明,有效的水利土壤改良措施是排水冲洗(地下水位較深的除外),在鹽碱化程度較重的地区特别需要良好的排水設施。但是,在我国黄河中下游、濱海鹽碱土区以及其他窪涝鹽碱地区,限于排水出路,不易建立良好的自流排水系統,因而冲洗 The domestic and international measures to improve saline-alkali soil are to irrigate the soil under drained or undrained conditions so as to desalinate the soil. Afterwards, soil fertility is increased through appropriate agricultural techniques and the growth of crops is guaranteed. Scientific research and production practices have proved that effective water improvement measures are drainage and flushing (except for those with deep groundwater levels), and particularly good drainage facilities are required in places where salinization is serious. However, in the middle and lower reaches of the Yellow River, the coastal saline-alkali soil areas and other areas where salinity and salinity are limited, drainage outlets are not suitable for establishing a good gravity drainage system,