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对于一特殊土层结构—上土下砂双层结构土壤，建立了洗盐定额的确定方法，通过实例验证，该方法确定的洗盐定额是合理的
For a special soil structure - upper soil and lower sand double soil structure, established a method to determine the amount of salt washing, confirmed by an example, the determination of salt washing method is reasonable