Factors determining minimum level of mineral nitrogen forms in water on agricultural areas
1996
Koc, J. | Ciecko, C. | Janicka, R. | Rochwerger, A. (Akademia Rolniczo-Techniczna, Olsztyn (Poland). Katedra Melioracji i Ksztaltowania Srodowiska Rolniczego)
Studies in Olsztyn Lakeland showed that in respect of N concentration the surface water may be ranged as follows: drainage outflows land reclamation ditches small post-glacial lakes streams forest streams sources. Agricultural use of land increases N content in surface water. Nitrate content rises mainly in drainage water, in ditches - organic N while the ammonium N in small post-glacial lakes. The main sources of ditch water pollution are rural settlements and farms, nitrate content is affected mostly by sub-surface flow. At oxygen deficit the nitrites may occur in water as a result of organic pollution inflow or anaerobic transformations (small post-glacial lakes in winter)
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