WP 3-1 Hot moments
University of Rostock  (PI: Bernd Lennartz, responsible processor: Stefan Koch)

Hot moments of P leaching from soils and agricultural fields will be identified by analyzing existing data sets from various sources and monitoring stations such as the tile-drained test sites at Lückstedt, Saxony-Anhalt (cooperation UFZ).The existing monitoring field stations near Rostock will be upgraded to better cover flux intensive events and to quantify sediment loads.
WP 3-2 Hot spots
University of Rostock (PI: Bernd Lennartz, responsible processor: Stefan Koch)

Hot spots of P leaching will be identified by analyzing the general ability of various soils to transport dissolved and particulate compounds. Three field sites differing in clay content will be subjected to dye tracing experiments applying Brilliant Blue and TiO2. A quantitative P leaching experiment installing various mini-suction-plates, allowing for spatially differentiated sampling, will amend the more qualitative dye experiments. The leaching potential of glyphosate will additionally be determined in batch adsorption experiments (cooperation Leinweber).
WP 3-3 Modelling
University of Rostock (PI: Bernd Lennartz, responsible processor: Stefan Koch)

Results from data analysis and newly conducted experiments will be subjected to model analysis to deepen process understanding. Field and catchment P fluxes will be firstly depicted employing simple mixing models and later using complex catchment models such as the SWATpackage.