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Potential benefits of farm scale measures versus landscape measures for reducing nitrate loads in a Danish catchment
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 need for balancing measures at farm and landscape scale to maximize N load reduction while minimizing loss of productive land. The effectiveness of farm scale measures is affected by farm and soil types as well as by N-reduction in groundwater, while the possibilities for using wetlands for decreasing the N-load depends on landscape features, allowing the establishment of wetlands connected to streams and rivers.
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Many European countries currently fail to meet the EU Water Framework Directive of good ecological status of coastal waters.
“As currently many European countries fail to meet the EU Water Framework Directive of good ecological status of coastal waters, reductions in nitrate leaching from agriculture are needed (Hashemi et al. 2018).”
From Cover crops and optimal N management reduce nitrate leaching to background levels in grass-clover–barley rotations on sandy soil (2026) · cites this paper as Hashemi et al. 2018
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Eriksen, J., Jensen, J. L., Larsen, S. U., Thers, H., & Vogeler, I. (2026) · Nutrient Cycling in Agroecosystems · doi:10.1007/s10705-026-10479-z · Cited by 1
“As currently many European countries fail to meet the EU Water Framework Directive of good ecological status of coastal waters, reductions in nitrate leaching from agriculture are needed (Hashemi et al. 2018).”
Metadata
- Authors
- Hashemi, F., Olesen, J. E., Børgesen, C. D., Tornbjerg, H., Thodsen, H., & Dalgaard, T.
- Affiliations
- Aarhus University (DK)
- Corresponding author
- Hashemi, Fatemeh
- ORCID
- Venue
- Science of The Total Environment
- Publisher
- Elsevier BV
- Published
- 2018-10
- Volume
- 637-638
- Pages
- 318-335
- ISSN
- 0048-9697 (ISSN-L)
- OpenAlex
- W2801743163
- Cited by
- 22
- References
- 1
- Citations by year
- 2026: 2 · 2024: 2 · 2023: 2 · 2022: 2 · 2021: 3 · 2020: 4 · 2019: 5 · 2018: 2
- FWCI
- 1.83
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Science of The Total Environment (publishedVersion)
- PubMed (publishedVersion)
- Funders
- BONUS program
- Swedish Environmental Protection Agency
- National Centre for Research and Development
- German Ministry for Education and Research
- Russian Foundation for Basic Research
- Topics
- Physical Sciences › Environmental Science › Environmental Chemistry › Soil and Water Nutrient Dynamics
- Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Sustainable Agricultural Systems Analysis
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil erosion and sediment transport
- Keywords
- nitrate leaching, crop rotation, cover crops, wetland restoration, set-aside, Water Framework Directive, agricultural non-point source pollution, groundwater nitrate, land use change
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