Potential benefits of farm scale measures versus landscape measures for reducing nitrate loads in a Danish catchment

The Science of the Total Environment
Fatemeh HashemiTommy Dalgaard

Abstract

To comply with the EU Water Framework Directive, Denmark must further reduce the nitrate (N)-load to marine ecosystems from agricultural areas. Under the anticipated future spatially targeted regulation, the required N-load reductions will differ between catchments, and these are expected to be mitigated by a combination of land and water management measures. Here, we explored how the expected N-load reduction target of 38% for a Danish catchment (River Odense) could be achieved through a combination of farm and landscape measures. These include: (a) N-leaching reduction through changing the crop rotation and applying cover crops, (b) enhancing N-reduction through (re)establishment of wetlands, and (c) reducing N-leaching through spatially targeting of set-aside to high N-load areas. Changes in crop rotations were effective in reducing N-leaching by growing crops with a longer growing season and by allowing a higher use of cover crops. A combination of wetlands and changes in crop rotations were needed for reaching the N-load reduction target without use of set-aside. However, not all combinations of wetlands and crop rotation changes achieved the required N-load reduction, resulting in a need for targeted set-aside, implying a...Continue Reading

Citations

Sep 13, 2020·Ambio·Fatemeh Hashemi, Brian Kronvang
Oct 23, 2019·The Science of the Total Environment·Hyojin KimBirgitte Hansen
May 18, 2021·The Science of the Total Environment·Rasmus Jes PetersenBrian Kronvang

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