Acid sulphate soils cause acidification of the adjacent watercourses, which is harmful for the fishing industry, for example. With the aim of reducing acidity problems the effects of drainage on acid soils have been estimated and the possibilities of liming acid sulphate soils after digging ditches have been studied. Means for reducing acidity in connection with drainage by either doing the work in stages or preventing an excessive drop in the groundwater table have been considered. Methods for the direct liming of watercourses have been examined and their effects evaluated.

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