1. General Model Information

Name: soil-plant system model

Acronym: EXPERT-N

Main medium: terrestrial
Main subject: biogeochemistry
Organization level: Ecosystems
Type of model: partial differential equations (PDE), ordinary differential equations (ODE)
Main application: Research, Management
Keywords: nitrogen, agriculture, soil water, soil temperature, nitrification, evaporation, leaching, irrigation, plant uptake


Dr. Eckart Priesack
GSF-Forschungszentrum / IBOe
Neuherberg, Postfach 1129
85758 Oberschleissheim - Germany
Phone: +49 89 3187 3354
Fax : +49 89 3187 3376
email: priesack@gsf.de


Michele Baldioli
Thomas Engel
Christian Haberbosch
Beate Kloecking
Enli Wang
Eckart Priesack
Thomas Schaaf
Christoph Sperr
Sebastian Gayler


Expert-N is a development system for nitrogen turnover models to simulate the N cycle in arable agriculture. The system consists of modular model components for soil water flow, for soil heat and N transport and for crop growth. These components are built up of different standardized model units representing each a single process as N mineralization for N transport or root water uptake for crop growth. The modular structure allows an easy exchange of model units to compare different submodels or model algorithms describing the same process. For each component and model unit several distinct interchangeable submodels are available and additional user defined submodels can be included easily by the supported use of dynamic link libraries. This enables the user to analyse the impact of different or new modelling approaches on the simulation results component by component. By the modular structure Expert-N is also an extremely flexible simulation model for N dynamics in soil-plant systems, which can be easily adapted to the actual simulation purpose including management or research, to the specific site conditions involving crop, soil and agricultural practice and to the quality and availability of data. Based on a user friendly graphical interface, a windows system for personal computers, Expert-N comprises a menu driven interactive input system to enter all necessary soil, weather, fertilizer and crop data for a particulary field and growing season. This and an online help function offering detailed documentations for every model unit allows even users with minimal computing experience to apply Expert-N and to calculate the mass balance and turnover of N in soils. Simulations are further supported by the possibility to display online the development of important state variables such as soil water content, soil temperature, amount of soil nitrate and plant or root biomass.

II. Technical Information

II.1 Executables:

Operating System(s): Windows Download Expert-N

II.2 Source-code:

Programming Language(s): Microsoft Visual C++ (V 1.0)

II.3 Manuals:

Manual: AEG Electronic GmbH Sauerlach; TU Muenchen, Lehreinheit fuer Ackerbau und Informatik im Pflanzenbau Freising; GSF Forschungszentrum fuer Umwelt und Gesundheit, Institut fuer Bodenoekologie, Neuherberg: Expert N, Ein Baukastensystem zur Simulation der Stickstoffdynamik in Boden und Pflanze. Version 1.0 (1994). Complete model documentation: Priesack, E.: Modell-Beschreibung Expert N (1994).

II.4 Data:

(see executables, example data set)

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

Expert-N Publications

V. Further information in the World-Wide-Web

VI. Additional remarks

Additional information

ExpertN: Simulation Examples in the WorldWibeWeb. The interface uses the results from the output files (ASCII) generated by ExpertN and builds graphics (GIF), which are linked to the HTML-Page.

Last review of this document by: T. Gabele
Status of the document:
last modified by Tobias Gabele Wed Dec 4 01:31:29 CET 2002

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