J
Johannes Deelstra
Publications - 34
Citations - 617
Johannes Deelstra is an academic researcher. The author has contributed to research in topics: Surface runoff & Water quality. The author has an hindex of 12, co-authored 32 publications receiving 557 citations.
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Monitoring catchment scale agricultural pollution in Norway: policy instruments, implementation of mitigation methods and trends in nutrient and sediment losses
Marianne Bechmann,Johannes Deelstra,P. Stålnacke,H. O. Eggestad,Lillian Øygarden,A. Pengerud +5 more
TL;DR: Agricultural management and losses of nitrogen (N), phosphorus (P) and suspended sediments (SS) from eight small catchments in Norway were analyzed as discussed by the authors. But, despite the increased implementation of mitigation methods by farmers, improvements in water quality at the catchment scale can be attenuated.
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Regional variations in diffuse nitrogen losses from agriculture in the Nordic and Baltic regions
N. Vagstad,Per Stålnacke,Hans Estrup Andersen,Johannes Deelstra,Viesturs Jansons,Katarina Kyllmar,Enn Loigu,S. Rekolainen,R. Tumas +8 more
TL;DR: In this paper, the authors describe nitrogen losses from, and the characteristics of, 35 selected catchments (12 to 2000 ha) in the Nordic and Baltic countries in the 1990s.
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Climate change and the potential effects on runoff and nitrogen losses in the Nordic–Baltic region
Lillian Øygarden,Johannes Deelstra,Ainis Lagzdins,Marianne Bechmann,Inga Greipsland,Katarina Kyllmar,Arvydas Povilaitis,Arvo Iital +7 more
TL;DR: In this paper, an overview of the expected climatic changes in the Nordic-Baltic region, and the possible effects of these changes on runoff and Nitrogen losses are given.
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Effects of large-scale changes in emissions on nutrient concentrations in Estonian rivers in the Lake Peipsi drainage basin
TL;DR: In this article, the impact of the fall of the Iron Curtain on concentrations of nutrients (N and P) at 22 sampling sites on Estonian rivers are examined, and statistically significant downward trends (one-sided test at the 5% level) in total nitrogen (TN) concentrations at 20 of the 22 sites.
Journal ArticleDOI
Reprint of “Hydrological pathways and nitrogen runoff in agricultural dominated catchments in Nordic and Baltic countries”
Johannes Deelstra,Arvo Iital,Arvydas Povilaitis,Katarina Kyllmar,Inga Greipsland,Gitte Blicher-Mathiesen,Viesturs Jansons,Jari Koskiaho,Ainis Lagzdins +8 more
TL;DR: In this article, a comparison of the magnitude and variation of the baseflow and flashiness in streams in relation to the selected geographical and drainage characteristics for thirty studied agriculture dominated catchments in the Nordic and Baltic countries and the effects it can have on nitrogen loss is presented.