1. General Model Information

Name: Hermes - nitrogen balance in plants simulation

Acronym: HERMES

Main medium: terrestrial
Main subject: biogeochemica
Organization level: Ecosystems
Type of model: compartment model
Main application:
Keywords: crop growth, denitrification, farm management, fertilizer recommendation, net mineralization, nitrate transport, nitrogen uptake, water balance


Kurt Christian Kersebaum
ZALF Muencheberg e.V.
Institut fuer Landschaftsmodellierung
Eberswalderstr. 84
15374 Muencheberg, Germany
Phone: ++49-33432-82-394
Fax : ++49-33432-82-334
email: 100663.2140@compuserve.com


Kurt Christian Kersebaum
Joerg Richter


contents of the model
The model simulates the following processes: net mineralization, water balance and fluxes, nitrate transport, denitrification, crop growth, development and N uptake by plants. A fertilizer recommendation is given based on a predictive simulation of nitrogen support of the soil compared to the nitrogen demand of the plant. Therefore weather scenarios can be used based on average weather data of a specific site. The model can be linked to a commercial data management environment (PC-AGRAR, Pfarrkirchen).
principles of the model
water balance: modified capacity model; nitrate transport: convection-dispersion equation; net mineralization: 2 pools of pot. mineralizable nitrogen with first order kinetics dependent on temperature and soil moisture; denitrification: Michaelis-Menten kinetics dependent on nitrate content, water filled pore space and temperature; crop growth: gross photosynthesis and respiration based on the SUCROS model (van Keulen et al. 1982); crop development: biol. time based on thermal time, vernalization and day length.

Author of the abstract: UFIS - Environmental research information system

II. Technical Information

II.1 Executables:

Operating System(s): MS-DOS Type of computer: PC, at least 80286 recommended Disc space: ca. 300 KB (Model + input files + output files) without data management environment. Peripherical software required: Database management environment (data input, link to automatic weather station) from PC-Agrar available. List of files:
HERMES.EXE   simulation model
HYPAR.TRU    capacity parameters
PARCAP.TRU   capillary rise parameters
S????.TRU    field data input file
W????.9?     weather data of year 199?
R????.9?     rainfall data of year 9?
E????.9?     output of daily state variables
All files are available by PC-Agrar, Pfarrkirchen (purchase).

II.2 Source-code:

Programming Language(s): TRUE-BASIC V.2.02

II.3 Manuals:

Manual: PC-Agrar: Handbuch zum Stickstoffsimulationsmodell "Hermes", Manual, PC-Agrar Informations- und Beratungsdienst, 21p. (1994).

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

This is a list of model quantities sorted by their characteristics with hypertext links for more details.

III.2.1 Input

III.2.2 Output

IV. References

Diekkrueger, B., Soendgerath, D., Kersebaum, K. C., McVoy, C. W., 1995.
Validation of agroecosystem models. A comparison of results of different models applied to the same data set, Ecol. Model., 81, pp. 3-30.

Groot, J.J.R., Verberne, E.L.J., 1991.
Response of wheat to nitrogen fertilization, a data set to validate simulation models for nitrogen in crop and soil, Fertilizer Research, 27, Kluwer Academic Publishers, pp. 349 - 383.

Kersebaum, K.C., 1989.
Die Simulation der Stickstoff-Dynamik in Ackerboeden,
Ph. D. Thesis, University Hannover, 149p..

Kersebaum, K.C., 1995.
Application of a simple management model to simulate water and nitrogen dynamics,
Ecol. Model., 81, pp. 145-156.

Kersebaum, K.C., Richter, J., 1991.
Modelling nitrogen dynamics in a plant soil system with a simple model for advisory purposes, Fertilizer Research, 27,
Kluwer Academic Press, pp. 273-281.

van Keulen, H., Penning de Vries, F.W.T., Drees, E.M., 1982.
A summary model for crop growth. In: Penning de Vries & van Laar: Simulation of plant growth and crop production.
PUDOC, pp. 97-97.

McVoy, C.W., Kersebaum, K.C., Arning, M., Kleeberg, P., Othmer, H., Schroeder, U., 1995.
A data set from north Germany for the validation of agroecosystem models: documentation and evaluation, Ecol. Model., 81, pp. 265-300.

PC-Agrar, 1994.Handbuch zum Stickstoffsimulationsmodell "Hermes"
Manual, PC-Agrar Informations- und Beratungsdienst, 21p.

V. Further information in the World-Wide-Web

VI. Additional remarks

Additional information
Last review of this document by: R. Patzak : 2. October 1997 -
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:44 CEST 2002

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