1. General Model Information
Name: Minerva - nitrogen dynamics in arable soil
Main medium: terrestrial
Main subject: biogeochemistry
Organization level: Ecosystems
Type of model: compartment model
Keywords: denitrification, plant uptake, arable soils, infiltration, water movement, nitrogen, fertilizer, capacity cascade soil water model, first order kinetics
Andreas J. Beblik
Institut fuer Boden- und Gewaesserschutz
Fax : +49-531-377489/-3918170
Andreas J. Beblik
Kurt Christian Kersebaum
contents of the model
MINERVA is a deterministic model for simulation of nitrogen dynamics in arable soils. It consists of submodels for net infiltration, water movement, N mineralization and nitrate movement through soil column as well as for plant uptake and dry matter production. It was designed for advisory purposes, e.g. fertilizer recommendation. The extended version can be used in combination with geographic information systems for site specific simulations in medium scaled regions.
principles of the model
Net infiltration at surface is calculated from daily precipitation and actual evaporation. Water movement is described by means of a cascade model, based onfield capacity of different layers. Mineralization of nitrogen follows 1st order kinetics, based on pools with slow and fast decomposable organic matter. Nitrogen pools regard mineral and organic fertilizers as well as residues. Nitrate transport is calculated with diffusion convection equation. Plant development is controlled by a heterogeneous sum of air temperatures (6 phases from germination til maturity). Dry matter production is based on solar irradiation and leaf area index of the canopy. Daily rates of dry matter production are distributed on 4 plant compartments (roots, leaves, stem, storage organ) in relation to the phenologic.
Author of the abstract: UFIS - Environmental research information system
II. Technical Information
Operating System(s): DOS 3.3 or higher / Linux 1.2 / Solaris 2.3 Type of computer: PC 286 or better / PC 386 or better / Sun Workstation RAM required: mind. 540kb / max. 1MB / max. 1MB Portability onto other systems: MINERVA will be ported to Microsoft Windows (Win3.1) til early 1996. Peripherical software required: DOS: graphics.lib; UNIX: libncurses.a, libvoufis/gle.a. Model package includes basic tools for presentation, print out, data base editing. Suitable extensions are dBase, CoPlot.
Programming Language(s): Microsoft C 7.0a, Ansi C, Compiler: MSC 7.0a, GNU C 2.6.3
Complete model documentation: Kersebaum, K.C.: Die Simulation der Stickstoff-Dynamik in Ackerboeden, Ph. D. Thesis, University Hannover, 149p. (1989).
III. Mathematical Information
Kersebaum, K.C., 1989.
Die Simulation der Stickstoff-Dynamik in Ackerboeden.
Ph. D. Thesis, University Hannover, 149p.
V. Further information in the World-Wide-Web
VI. Additional remarks
Last review of this document by: T. Gabele: 14.July 1997 -
Status of the document:
last modified by
Tobias Gabele Wed Aug 21 21:44:45 CEST 2002