Temporal Trends in Phosphorus Concentrations and Losses from Agricultural Monitoring Sites in Latvia

Abstract The Baltic Sea is the youngest sea on our planet, environment of considered to be unique and fragile. It affected by various human activities resulting in impairment water quality. Riverine nutrient (nitrogen phosphorus) loads are among major causes eutrophication Sea. This study examines temporal trends discharge, total phosphorus (TP) orthophosphate-phosphorus (PO4-P) concentrations losses from three agricultural runoff monitoring sites Latvia including Berze, Mellupite, Vienziemite. annual datasets TP PO4-P were tested for statistical using a nonparametric test - Mann-Kendall trend test. timeframe this was 1995 until 2018. results show large variety mean period. No statistically significant detected losses. Meanwhile, downward observed four out six two concentrations.