Preliminary study on classification & grading standards and causes & hazards of secondary salinization of facility vegetable soils
设施菜地土壤次生盐渍化的成因、危害及其分类与分级标准的研究进展

As one of the most productive industries, Facility Vegetable Cultivation has developed rapidly in China during the recent three decades. However, the problems, such as the widespread irrational using fertilization, nutrient imbalance, declined fertilizer efficiency, serious resource waste and so on, also resulted in the serious enrichment of soil nutrients and salt accumulation. In this paper, the status, causes, hazards of the second salinization in Chinese facilities vegetable soils were reviewed and analyzed. On this basis we proposed to develop a standard for the classification and grading of soil second salinization and gave a framework of this standard, aiming to provide theoretical guidance and scientific basis for the prevention /control of the second salinization and for the sustainable use of facility vegetable soils.