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Small kettle holes filled with water are commonly found objects in damp lowland landscape. Their location within an agricultural and forest area may cause, irrespective of the land use, the enrichment in biogenic substances. Deficiency of data about the phosphorus and nitrogen content in the sediments of small water bodies, which makes the discussion of this subject more difficult and restricting it only to large water reservoirs. The chemistry of the surface layer of bottom sediments (organic matter, phosphorus, ...