Abstract
The aims of the study were to describe 1) the overall relationship between additions of nitrogen (as fertilizer and manure) to the ground surface and the nitrate concentrations in groundwater and streams, as well as 2) the consequences of changes in agricultural management practices. A mathematical modelling system has been established, which comprise two models, 1) a physically-based rootzone model (DAISY) for simulation of the nitrogen dynamics in the rootzone, and 2) a physically-based and fully distributed catchment model (MIKE SHE) for simulation of the water and solute transport in a catchment. The modelling system includes the nitrate transformations in the rootzone and at the redoxcline in the aquifer. Nitrate movement is described from application on the field to its occurrence in the stream.
The article describes the modelling system and the data requirements. The model was tested on the 425 km2 Karup stream catchment. Inputs used and results of simulations with the system are given in part II (this issue).
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Styczen, M., Storm, B. Modelling of N-movements on catchment scale - a tool for analysis and decision making. Fertilizer Research 36, 1–6 (1993). https://doi.org/10.1007/BF00749942
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DOI: https://doi.org/10.1007/BF00749942