Most inland waters in Germany will not meet the good ecological status requirements stipulated in the EU Water Framework Directive by 2015. It was previously assumed that phosphorus is the primary determinant of water quality. In NITROLIMIT I it has been proved that nitrogen is also a crucial control variable for many surface waters and its reduction ecologically meaningful. This has led to demands for procedures to ensure the reduction of nitrogen input. For economical considerations catalogues about measures for nutrient reduction, their efficiency and expense have been created and their economic feasibility analyzed.


  • Verify target values for N- and P-concentrations to meet the good ecological status, so as to support decisions about management procedures
  • Fill the gap of knowledge about N- and P-turnover processes
  • Clarify efficiency and expense of reduction procedures
  • Calculate the willingness of farmers to perform agro-ecological procedures
  • Create concepts considering nitrogen and phosphorous to improve water quality. Here, the focus will be mainly on the process control of water networks typical for the north-east German lowlands. As an example, concepts will be created for the catchment area of the river Dahme, influencing urban streams of Berlin.