在地下水位高而矿化度强的地区建立排水系統,降低地下水位,藉以改变水盐的平衡状态是改良盐土的主要途径。我們于1956年在透水不良的土地上(地表下1米处出現粘土层)采用深浅沟相結合的洗盐措施,曾轻取得較为良好的洗盐效果。但又感到60～70厘米的深度失之过浅,若再加深則断面更大(若深度 It is the main way to improve the saline soil that the drainage system is set up in areas with high groundwater table and mineralization to reduce the water table and to change the balance of water and salt. In 1956, we adopted a combination of shades of depths and furrows to wash salt on impervious land (clay layer 1m below the surface of the earth) in 1956 and gave a comparatively good effect of washing salt. But felt the depth of 60 to 70 cm loss too shallow, if further deepened section larger (if the depth