1. General Model Information

Name: ontogenesis model winter wheat

Acronym: ONTO-WW

Main medium: terrestrial
Main subject: agriculture, biogeochemistry
Organization level: Populations
Type of model: compartment model
Main application:
Keywords: development, vernalization, ontogenesis, winter wheat plant,


Dr. Peter Wernecke
AGRO-Oekosystemforschung Quedlinburg
Neuer Weg 22
06484 Quedlinburg, Germany
Phone: +49-3946-965616
Fax : +49-3946-965632
email: wernecke@aof-qlb.uni-halle.de


Dr. Peter Wernecke
Dr. Stephan Claus


contents of the model
ONTO-WW is a dynamic model describing ontogenesis (development) and vernalization of winter wheat plants. The plant development is characterized by codes with respect to scales of development stages like germination, emergence, shooting, flowering and maturity of grain. The rates of the state variables of the model depend essentially on the air temperature, but also on soil temperature, relative air humidity, soil moisture, photoperiod (day length). The computed variables allow to predict phenological events and their durations.
principles of the model
State variables of the model are development, vernalization, and water content of the kernel. The ordinary differential equations for the development variable represents a generalization of the heat or temperature sum concept. The development variable is independent of the used scale of codes for the development stages of the plants, and is converted into a scale of codes by means of a table function.

II. Technical Information

II.1 Executables:

Operating System(s): MS-DOS Type of computer: PC, at least 80286, Coprozessor recommended

II.2 Source-code:

Programming Language(s): Turbo Pascal 7.0

II.3 Manuals:

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

Wernecke, P., Claus, S., 1992.Extension and Improvement of Descriptive Models for the Ontogenesis of Wheat PlantsModelling Geo-Biosphere Processes 1, pp. 131-144.

V. Further information in the World-Wide-Web

VI. Additional remarks

Coupling with Growth models from Quedlinburg is possible.

Additional information
Last review of this document by: R. Patzak : 7.October 1997 -
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:46 CEST 2002

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