b'Targeted drainage measures for improvement of water quality in DenmarkKronvang B1, Zak D1, vant Veen S1, Hoffmann CC11Department of Bioscience, Aarhus University, Vejlsvej 25, 8600 Silkeborg, DenmarkThe losses of nitrogen (N) and phosphorus (P) from point and diffuse sources to surfacewaters in Denmark have been reduced considerably during the last 3 decades. However, a further reduction in nutrient losses are needed to obtain good ecological quality in water bodies, a goal which is not easily achieved as the low hanging fruits for nutrient management already are fully exploited. Furthermore, farmers were again allowed to increase their fertilisation of crops to the economic optimum in 2017. This less stringent regulation of fertilisation in Denmark wasimplemented in exchange of farmers having to implement new collective and targeted regulations. One such targeted regulation is an open call for adoption of supplementary catch crops in areas where groundwater or estuarine waters are threatened by excess nitrate and where natural N removal in groundwater is reasonable low. Furthermore, a limit for P inputs to fields was implemented in 2018 being set for different animal types and being stricter for farming in catchments of vulnerable lakes. The collective measures include larger schemes for wetland restoration, constructed wetlands (CWs), afforestation and taking organic soils out of production. A new scheme with catchment officers was at the same time implemented in Denmark with the aim to bridge farmers, municipalities and nationalagencies. Finally, a sub-catchment based targeted nutrient regulation will be adapted from 2019 and include a suite of new mitigation measures such as e.g. integrated buffer zones andbiofilters, which have all being scientifically tested. Such a scientific documentation is essential to know the processes that control their local effects for N and P, their relative importance over time, need for management and their cost-efficiency. This presentation will provide an overview of the state of regulation of agriculture in Denmark as well as provide empirical evidence on the effectiveness of different targeted mitigation strategies and new ways of assisting in finding local placement with farmers to facilitate a local adaptation.15'