1. General Model Information

Name: SOIL-N - simulation model for nitrogen conditions in soils

Acronym: SOIL-N

Main medium: terrrestrial
Main subject: biogeochemistry
Organization level: Ecosystems
Type of model: compartment model
Main application: research
Keywords: agriculture, deposition, fertilization, forest, manure, nitrogen, plant-soil ecosystem, nitrification, denitrification, leaching, decomposition, soil, water, plant uptake,


Per-Erik Jansson

Royal Institute of Technology,
Dept of Civil and Environmental Engineering

Phone: 46 8 790 82 86
Fax: 46 8 411 07 75
email: Per-Erik.Jansson@aom.kth.se


Per-Erik Jansson


The model became part of CoupModel - Coupled heat and mass transfer model for soil-plant-atmosphere system !

contents of the model
The SOILN model was designed to simulate transport and transformations of nitrogen in soils and its uptake by plants. It was designed by the same author as the SOIL model, of whom SOILN is dependent. It uses some of the SOIL output data as input. SOILN includes the following processes: mineralization of humus; mineralization/immobilization of carbone and nitrogen fraction in crop residue and the manure; nitrification; denitrification; nitrate leaching; plant uptake. Nitrogen treatment by plants depends on the plants. Therefore two submodels exist, CROP by Eckersten&Jansson, 1991, and FORESTSR by Eckersten, 1991, which simulate the processes within the plants either for crops (CROP) or trees (FORESTSR). In SOILN this fraction is stored in the compartment N_{plant}.
principles of the model
The soil mineral nitrogen pools receive nitrogen by mineralisation of litter and humus, nitrification, fertilization and deposition and loose nitrogen by immobilization to litter, nitrification, leaching, denitrification and plant uptake. It is also influenced by vertical redistribution. All biological processes depend on soil water and temperature conditions. The soil is dividedinto layers from which plants are taking nitrogen in various rates. Leaves take up carbon as Roots take up the nitrogen. The leaf area captures the necessary radiation for the photosynthesis. The actual growth of the plants is the potential growth, which is proportional to the intercepted radiation, reduced by the different stresses. The nitrogen demand of the plants is proportion

II. Technical Information

II.1 Executables:

Operating System(s): any DOS

II.2 Source-code:

Programming Language(s): FORTRAN & C

II.3 Manuals:

Jansson, Per-Erik: The SOILN model: User's manual, Communications, 91:6, Swedish University of Agricultural Science (1991), pp. 49.
Complete model documentation: Jansson, Per-Erik: SOILN: simulation model for nitrogen conditions in soils, still to fill in (1992), pp. 421-446.

CoupModel: ftp://amov.ce.kth.se/CoupModel/CoupModel.pdf

II.4 Data:

A full collection of tutorials is included in the help that comes with CoupModel.
Presently two help files exist: (1) CoupModel.hlp and (2) Coup99.hcm
The later help file could also be downloaded as an Acrobat file suitable for printing. This file will substitute previous technical descriptions.

In addition also the tutorials can be printed out as Acrobat file:

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

see also: CoupModel

Eckersten, H., & Jansson, P-E., 1991. Modelling water flow, nitrogen uptake and production for wheat. Fertilizer Research 27:313-329.

Eckersten, H., Jansson, P-E. & Johnsson, H., 1994. SOILN model, user's manual. 2nd edition Division of Agricultural Hydrotechnics Communications94:4, Department of Soil Sciences, Swedish University of AgriculturalSciences, Uppsala. 58pp.

Jansson, P.E., 1991. The SOILN model: User's manual
Communications 91:6, Swedish University of Agricultural Science, pp. 49 p.

Jansson, P.E., 1992.SOILN: simulation model for nitrogen conditions in soils still to fill in, 421-446.

Johnsson, H., Bergstrvm,L., Jansson, P-E. & Paustian, K. 1987. Simulation of nitrogen dynamics and losses in a layered agricultural soil. Agriculture,Ecosystems & Environment 18:333-356.

V. Further information in the World-Wide-Web

VI. Additional remarks

SOILN can be applied to simulate the nitrogen processes in nearly any kind of soil. In simulating together with its submodels CROP and FORESTSR and after running the model SOIL, this whole package can be used at a wide range of questions concerning the interactions between nitrogen, soil water, heat, plants, climate and human interventions.

Additional information

The model became part of Coupmodel - Coupled heat and mass transfer model for soil-plant-atmosphere system !
Last review of this document by: Juergen Bierwirth Mon Sep 18 21:38:36 MET 2000
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:49 CEST 2002

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