Abstract
The long-term trends of mean monthly nitrate concentrations in stream and drainage runoff were evaluated in the experimental microbasin Rybárik (0.119 km2) at the Institute of Hydrology, Slovak Academy of Sciences, during the period 1987–2005. The results of analyses indicate a decreasing trend of nitrate concentration after the year 1989, but with relatively high losses in some years and relatively low losses in other years. This decreasing trend is mainly caused by a decrease in the use of nitrogen fertilizers. The nitrate concentration in surface runoff strongly correlates with runoff and fertilization. Based on measured data, an empirical relation was found describing the dependence of annual nitrate transport in the stream on annual runoff depth and on the annual amount of applied nitrogen fertilizers.
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Sebíň, M., Pekárová, P. & Miklánek, P. Evaluation and indirect estimation of nitrate losses from the agricultural microbasin Rybárik. Biologia 62, 569–572 (2007). https://doi.org/10.2478/s11756-007-0113-5
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DOI: https://doi.org/10.2478/s11756-007-0113-5