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盐碱比较严重的地区,在地下水位高或极面上升的条件下,土壤改良必须从排水求得根本解决。加强灌溉管理、降低用水定额、防止渠道渗漏、截流地下水源、栽植护田林带虽然都在一定程度上有减少地下水补给、降低地下水位的作用,但不能使土壤得到根本改良和防止次生盐渍化。只有直接排水,迅速降低地下水位,井将淋洗的盐类输出灌区之外,才能使土壤脱盐彻底。
Saline more serious areas, groundwater level in the high or polar conditions, soil improvement must be fundamentally solved from the drainage. Strengthening irrigation management, reducing water quota, preventing canal leakage, intercepting groundwater source and planting protection forest belt all reduce groundwater supply to a certain extent and reduce groundwater level, but can not make soil be fundamentally improved and prevent secondary salts Staining. Only direct drainage, quickly reduce the water table, wells will leach salt output irrigation area, in order to make the soil desalination thoroughly.