Risk of nitrate discharge according to § 7 AVV GeA of the reference plots in NRW as of 01/2022

The “maximum tolerable N balance in kg N/(ha*a) to comply with the groundwater threshold value of maximum 50 mg/L in the seepage water below the root-capable soil zone” is shown for each field block. This is the median value per field block from the GROWA+ NRW 2021 calculation model, calculated in accordance with the provisions of § 7 AVV GeA and Annex 3. The model result was determined as part of the GROWA+ NRW 2021 project by the Jülich research center in a 100 x 100 m Grid calculated according to the methodology described in Appendix 3 of the AVV GeA. Based on the values ​​per grid cell, the median values ​​per field block were determined. The median value was calculated by the LANUV. The calculation is based on the following input data: • Denitrification conditions in the soil according to soil map 1:50,000 (GD NRW) • Usable field capacity according to soil map 1:50,000 (GD NRW) • Root penetration depth according to soil map 1:50,000 (GD NRW) • Grid (100 x 100 m) of land use created on the basis of ATKIS-DLM and INVEKOS 2016/2017 as part of the GROWA+ NRW 2021 project (Thünen Institute / Chamber of Agriculture NRW), as of 2019 • Long-term average seepage water rate calculated with the water balance model mGROWA (FZ Jülich) per grid cell 100 x 100 m for the time series 1991-2010, as of 2019 • Most recent available land-use-specific atmospheric N-deposition as a background value from the PINETI3 project of the Federal Environment Agency, based on the time series 2010-2015 The dataset contains the field blocks according to the field block statistics NRW 2021 as polygons (feature in geodatabase "GLDN-Nitrataustragsgefaehrdung-nach-Par-7-AVV-GeA_EPSG25832_Geodatabase.gdb" or shape "GLDN-Nitrataustragsgefaehrdung-nach-Par-7-AVV-GeA_EPSG25832").