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汾河三坝溉区地下水属劣质高矿化度水，用于农田灌溉时，在增加土壤水分的同时也增加了土壤的盐分，盐分的积累又危害农作物的生长发育。研究咸水灌溉土壤盐分变化规律是开发利用咸水资源的重要问题，封闭坑测的研究结果表明：利用咸水灌溉冬小麦、春玉米、棉花三种作物生育期分别积盐１２５３．４ｋｇ／亩、１４４３．９ｋｇ／亩、１３３７．９ｋｇ／亩；土壤剖面盐分分布情况是：２０ｃｍ以下各层土壤都处于盐积状态，变化趋势是从２０ｃｍ开始由小到大变化至８０ｃｍ，然后由大到小。农作物的产量随着咸水灌溉年限的增加而减少。小区试验研究表明：在每年有一次大定额河水灌溉和地下水有一定的径流条件下，利用咸水灌溉，灌后土壤盐分不超过作物耐盐极限时不减产，也不会开成长期积盐。
The groundwater in the three dam irrigation area of Fenhe River is poor quality and high salinity water. When it is used for farmland irrigation, it increases the soil salinity while increasing the soil moisture. The salt accumulation also harms the growth and development of crops. The study on the salinity variation of salinized irrigated soil is an important issue for the development and utilization of saltwater resources. The results of the closed pit test show that: salt water irrigation of winter wheat, spring corn and cotton, respectively, accumulates 1253.4kg / 1443.9kg / mu and 1337.9kg / mu respectively. The distribution of soil salinity in the soil profile is that the soil below 20cm is in salinity state, and the change trend is from 20cm to 80cm and then from big to small. The crop yield decreases as salt water irrigation increases. Community studies show that: once a year, a large fixed river water and groundwater runoff conditions, the use of salt water irrigation, irrigation soil salinity does not exceed the salt tolerance limit does not cut production, it will not open into long-term plot salt.