o:6329 Nitrogen Pressure Impact on groundwater nitrogen compound levels en Considering that roughly 70 percent of Serbian total land area is comprised of agricultural land, with about 90% of wastewater being discharged untreated, we have investigated these two potential sources of nitrogen to determine if they have a discernible impact on shallow groundwater quality. The research aimed to analyze nitrogen compound concentrations, dependencies, and correlations in specific groundwater bodies to understand their transformations and origins. The presence and trends of concentration levels of the following species: ammonium (NH4 +), nitrites (NO2 -), nitrates (NO3 -), organic nitrogen (ON), total nitrogen (TN), sodium (Na), chlorides (Cl), sulfates (SO4 2-), iron (Fe), manganese (Mn), arsenic (As), total organic carbon (TOC) and boron (B) were analysed along with state parameter pH and electrical conductivity. Selected parameters provide comprehensive insights into the chemical composition, nutrient dynamics, pollutant levels, and overall water quality, which are essential for environmental monitoring and management. The analysis revealed that 75% of the groundwater samples had nitrate content below 2.54 mgN/l and ammonium content below 0.33 mgN/l. The study examined groundwater quality and levels of nitrogen compounds at 55 sites within shallow alluvial aquifers, as part of the regular annual national monitoring program spanning from 2011 to 2016. Correlations indicated that ammonium cations in the groundwater are primarily of autochthonous geological origin, while nitrogen presence under oxic conditions can partially be attributed to anthropogenic influences, linking the nitrification of organic nitrogen and boron. The objective of the conducted research was to ascertain whether there were indications of anthropogenic influences on the shallow alluvial aquifers, leading to an increase in the concentration of nitrogen compounds in groundwater. anthropogenic impact, groundwater, nitrogen. 1552100 978-99976-816-8-3 2024-12-04T10:12:12.537Z 44 no 46 Marija Perović Jaroslav Černi Water Institute, Jaroslav Černi, Belgrade, Serbia 0000-0003-2045-001X Vesna Obradović Jaroslav Černi Water Institute Belgrade, Faculty of Technical Sciences University of Novi Sad person 0009-0008-2157-0615 application/pdf 745334 https://unilib.phaidrabg.rs/o:6329 no yes 1 70 92000004 71A04 XV International Scientific Agricultural Symposium “Agrosym 2024” Jahorina 1033 1038 Faculty of Agriculture, East Sarajevo 2024 October 10 - 13, 2024