Author(s)

B. Maticic

Abstract

Ground water and water from springs are sources used for water supply in Slovenia. The quality of these waters has been monitored since 1987. Among twelve main ground water aquifers in Slovenia the amount of nitrate exceeds the allowable level (50 mg/1) for drinking water in areas with more intensive agricultural production with higher concentrations of animals (2 livestock unit - LU/ha) and where drainage of sewage water is not excellently arranged or where quality of river water that effluent ground water is not well. The identification of nitrogen surpluses has been done on regional and farm level (using normative approach). This method is taking into account nitrogen input from mineral fertilizer, animal wastes and the depo

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