1. General Model Information

Name: PGWA 1.0 - Perennial grasses for West Africa conditions.

Acronym: PGWA1


Main medium: terrestrial
Main subject: agriculture, biogeochemistry
Organization level: population, ecosystem
Type of model: ordinary differential equations
Main application:
Keywords: perennial grass crop, tropical, West Africa, savannah, water limited conditions, nitrogen limited conditions

Contact:

Dr. S. Bonachela-Castano.
CSIC, Instituto de Agricultura Sostenible, Apdo 4084, 14080 Cordoba, SPAIN.
Phone:
Fax:
email: agzbocas@uco.es(ag280cas@uco.es)

Author(s):

Abstract:

PGWA is a model for water and nitrogen limited growth conditions. It simulates phenological development and growth, storage and recirculation of non-structural carbohydrates, water use and forage exploitation of a perennial grass crop in tropical areas with a well-pronounced dry season, such as the Sahel and Sudan zones of West Africa. Development and parameterization of the model is based on Adropogon gayanus, a tall, tufted grass that forms part of the vegetation of many savannah areas throughout Africa south of the Sahara. Nutrient and organic matter balances were not considered in this version.

Purpose of the model:

Model parentage: No.

Source of the Abstract CAMASE Register of Agro-ecosystems Models


II. Technical Information

II.1 Executables:

Operating System(s): IBM compatible PC/AT >= 640 Kb RAM.
Contract necessary:
Costs: : None.
Comments:

II.2 Source-code:

Programming Language(s): Microsoft FORTRAN-77 (FSE*).

II.3 Manuals:


Bonachela Castano, S., 1995. A model of a perennial grass (Andropogon gayanus) for West Africa (PGWA): description and user's guide. Rapport du projet Production Soudano-Sahelienne (PSS) No. 2. (gewijzigde versie). IER, Bamako / AB-DLO, Wageningen / & Haren / DAN-AUW, Wageningen. 25 pp. + 14 pp. app.
Yes.

II.4 Data:



III. Mathematical Information


III.1 Mathematics


III.2 Quantities

Rate variables: Dry matter production/partitioning, senescence, root depth, water uptake, reserves use and accumulation.


III.2.1 Input

Geographical and weather data, initial biomass and water availability, shoot nitrogen content, root depth, soil water characteristics. Input check in model: No.

III.2.2 Output


Basic spatial unit: 1 ha.
Time interval of simulation: 1 day.

IV. References


Bonachela Castano, S., 1995. A model of a perennial grass (Andropogon gayanus) for West Africa (PGWA): description and user's guide. Rapport du projet Production Soudano-Sahelienne (PSS)

V. Further information in the World-Wide-Web


VI. Additional remarks

Parentage: No.
Last review of this document by: T. Gabele: Dec 10 1997
Status of the document:
last modified by Joachim Benz Mon Jul 2 18:31:37 CEST 2007

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