Research Progress of Soil Salinization-Alkalization Remediation Technology

Soil salinization will not only hinder the absorption of water by plant roots, seriously affect plant growth and yield, but also lead to the deterioration of soil physical and chemical properties.Effective treatment and exploitation of soil salinization was helpful to increase the area of effective cultivated land and increase the reserve of reserve cultivated land.By reviewing the research progress of soil salinization remediation technology at home and abroad in recent years, the existing research results of salinized soil improvement technology were summarized, and it was concluded that,（1） the main research direction of agronomic measures to improve salinized soil was to optimize irrigation mode and improve irrigation technology, prevent the rise of groundwater level and reduce soil salinity;（2） The current research on the improvement technology of hydraulic engineering was relatively mature, and its main research direction was to reduce the groundwater level by improving the drainage facilities, and then reduce the salt content in the soil and improve the saline soil;（3） The current research on physical improvement technology was relatively mature, and the research direction was to improve the soil structure,break the plough layer, improve the soil water retention, and then reduce the salt content in the soil;（4） At present, the main research direction of chemical improvement technology was to apply chemical substances directly or indirectly to saline soil, and to determine their effects on soil physical and chemical properties;（5） At present, the main research direction of bioimprovement was to select, cultivate and plant saline-alkali tolerant crops, screen saline-alkali tolerant growth promoters, and improve saline soil by using saline-alkali tolerant plants and saline-alkali tolerant growth promoters. At present, the saline soil was improved by the combination of two or more technologies, and the selection of the improved technology also needs to be comprehensively selected according to the specific situation of the saline area.