Szukana fraza: [Abstract = "To start with, the external supply should be reduced. Treatment plants should be built or modified, but this is a slow process for financial reasons. Highly problematic will be the reduction of the dispersed supply, which is largely of agricultural origin, because almost the entire big catchment of Gopło is in agricultural use. It is necessary to change the land\-use pattern, especially near the lakes and its tributaries. Other measures include the planting of protective shrubby, grassy or woodland barriers, rational use of fertilisers, etc."]

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