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Agriculture 2017, 7(5), 41; doi:10.3390/agriculture7050041

Modelling Nutrient Load Changes from Fertilizer Application Scenarios in Six Catchments around the Baltic Sea

1
Department of BioScience, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark
2
Bioforsk, Division for Soil, Water and Environment, Frederik A. Dahlsvei 20, 1430 Ås, Norway
3
Department of Hydraulic Engineering, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences-SGGW, ul. Nowoursynowska 166, 02-787 Warszawa, Poland
*
Author to whom correspondence should be addressed.
Academic Editor: Paul Davidson
Received: 3 January 2017 / Revised: 12 April 2017 / Accepted: 25 April 2017 / Published: 3 May 2017
(This article belongs to the Special Issue Water Quality for Agriculture)
View Full-Text   |   Download PDF [937 KB, uploaded 3 May 2017]   |  

Abstract

The main environmental stressor of the Baltic Sea is elevated riverine nutrient loads, mainly originating from diffuse agricultural sources. Agricultural practices, intensities, and nutrient losses vary across the Baltic Sea drainage basin (1.75 × 106 km2, 14 countries and 85 million inhabitants). Six “Soil and Water Assessment Tool” (SWAT) models were set up for catchments representing the major agricultural systems, and covering the different climate gradients in the Baltic Sea drainage basin. Four fertilizer application scenarios were run for each catchment to evaluate the sensitivity of changed fertilizer applications. Increasing sensitivity was found for catchments with an increasing proportion of agricultural land use and increased amounts of applied fertilizers. A change in chemical fertilizer use of ±20% was found to affect watershed NO3-N loads between zero effect and ±13%, while a change in manure application of ±20% affected watershed NO3-N loads between zero effect and −6% to +7%. View Full-Text
Keywords: agricultural management scenarios; Baltic Sea; environmental modelling; SWAT agricultural management scenarios; Baltic Sea; environmental modelling; SWAT
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Thodsen, H.; Farkas, C.; Chormanski, J.; Trolle, D.; Blicher-Mathiesen, G.; Grant, R.; Engebretsen, A.; Kardel, I.; Andersen, H.E. Modelling Nutrient Load Changes from Fertilizer Application Scenarios in Six Catchments around the Baltic Sea. Agriculture 2017, 7, 41.

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