1. General Model Information

Name: GRASMOD - A GRASsland management MODel to calculate nitrogen losses from grassland.

Acronym: GRASMOD

Main medium: terrestrial
Main subject: agriculture
Organization level: ecosystem
Type of model: compartment model
Main application:
Keywords: grassland, management, nitrogen losses, pollution

Contact:

Dr. G.W.J. van de Ven.
Research Institute for Agrobiology and Soil Fertility (AB-DLO), , P.O.Box 14, 6700 AA Wageningen, THE NETHERLANDS.
Phone: +31.317.475939
Fax: +31.317.423110
email: g.w.j.van.de.ven@ab.dlo.nl

Author(s):

Abstract:

A grassland management model to calculate nitrogen losses on annual basis.

Purpose of the model:

Model parentage: New model.

Source of the AbstractCAMASE Register of Agro-ecosystems Models

II. Technical Information

II.1 Executables:

Operating System(s): Contract necessary: Costs: : Dfl. 110,=.

II.2 Source-code:

Programming Language(s): Microsoft FORTRAN.

II.3 Manuals:

Ven, G.W.J. van de, 1992. GRASMOD. A grassland management model to calculate nitrogen losses from grassland. Report 158, CABO-DLO, Wageningen. 109 pp.
Executable available: -

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

Grassland utilization method, N application rate, herbage supply level, milk production per cow, cattle type. Input check in model: Yes.

III.2.2 Output

N balance of grass, and animals in summer, production data, N losses are specified, influence of grazing quantified.
Basic spatial unit: Ha.
Time interval of simulation: Year.

IV. References

Boons-Prins, E.R. & G.W.J. van de Ven, 1993. Uitbreiding van het graslandbeheersmodel GRASMOD: invloed van de opfok van jongvee voor de melkveehouderij op stikstofstromen in grasland. CABO-DLO, Wageningen. Verslag 171. 37 pp.
Ven, G.W.J. van de, 1992. GRASMOD. A grassland management model to calculate nitrogen losses from grassland. Report 158, CABO-DLO, Wageningen. 109 pp.

Ven, G.W.J. van de, 1992. GRASMOD. A grassland management model to calculate nitrogen losses from grassland. Report 158, CABO-DLO, Wageningen. 109 pp.

V. Further information in the World-Wide-Web

VI. Additional remarks

Parentage: New model.

Last review of this document by: T. Gabele : Tue Sep 24 1997
Status of the document:
last modified by Joachim Benz Mon Jul 2 18:31:37 CEST 2007