采用盆栽试验和微区试验.结果表明,用低矿化碱性水灌溉黄淮海平原砂壤土一年至三年,土壤有盐化趋势,盐分累积集中在20cm以下土层;土壤pH值和碱化度提高,主要是游离碳酸钠增加所致.如用有机肥、绿肥、大麦秸秆、糠醛渣等有机物料和磷石膏、硫酸亚铁等无机物料预处理,可以减轻或防治土壤次生碱化,理化性状得以改善,作物产量明显提高. The pot experiment and the microzone experiment were carried out.The results showed that with low mineralized alkaline water, the sandy loam soil of Huang-Huai-Hai Plain was irrigated for one to three years with the trend of salinization and the salt concentration concentrated in the soil layer below 20 cm. The soil pH and alkali As a result of the increase of free sodium carbonate, pretreatment of inorganic materials such as organic manure, green manure, barley straw, furfural residue and other inorganic materials such as phosphogypsum and ferrous sulphate can reduce or prevent soil secondary alkalization , Physical and chemical properties can be improved, crop yield increased significantly.