1. General Model Information

Name: ORYZA_N 1.0 - Model for Potential and Nitrogen limited rice production.

Acronym: ORYZA_N1

Main medium: terrestrial
Main subject: agriculture
Organization level: ecosystem, population
Type of model: not specified
Main application:
Keywords: crop growth, rice, production, nitrogen limited


Ing. H. Drenth.
Research Institute for Agrobiology and Soil Fertility (AB-DLO), Dept. Agrosystems Research, P.O.Box 14, 6700 AA Wageningen, THE NETHERLANDS.
Phone: +31.317.475953
Fax: +31.317.423110
email: h.drenth@ab.dlo.nl



ORYZA_N simulates the growth of transplanted rice under potential and N limited conditions. N uptake is entered as a forcing function; or calculated for potential conditions. It is a starting point to further development into a structure which connects submodels of varying levels of detail, each submodel describing particular components of the crop-soil system. The main use is in evaluation and interpretation of experimental data, and development and testing of submodels. For this purpose, a requirement is that the user can easily make choices between submodels of different complexity levels, according to particular interests. Similarly, submodels can be replaced by measured time series, thus reducing the simulated system to a smaller core section. This user-model interaction is via switches that can be set according to the user's preference. The main difference between ORYZA1* and the current ORYZA_N version is that the latter includes nitrogen uptake and allocation to crop organs, via a number of subroutines.

Purpose of the model:

Model parentage: MACROS*-L1D and SUCROS*.

Source of the AbstractCAMASE Register of Agro-ecosystems Models

II. Technical Information

II.1 Executables:

Operating System(s): Costs: Dfl. 270,=. Comments:

II.2 Source-code:

Programming Language(s): CSMP* and FSE*.

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

Rate variables: Growth of crop and organs, development, photosynthesis, respiration, N demand at organ level, N uptake at organ level, N allocation and removal at organ level, N translocation at organ level.

State variables: Temperature sum plant and leaves, development stage, weights of crop and organs, tiller and grain number, N uptake, N amount in crop and organs.

III.2.1 Input

Latitude, elevation, maximum and minimum temperature, measured global radiation, sampling days, N application days, initial weights and N contents, initial phenological development stage, N application and sampling days, partitioning, harvest day, measured weights of crop and organs, amounts of N in crop and organs, leaf area, switches (to (in-)activate subroutines), transplanting date. Input check in model: No.

III.2.2 Output

Weights of crop and organs, amounts of N in crop and organs.
Basic spatial unit: Ha.
Time interval of simulation: Day.

IV. References

Drenth, H. & H.F.M. ten Berge, 1993. Documentation of test runs with ORYZA_N reference model for Potential and Nitrogen limited rice production. Simulation Report CABO-TT. Centre for Agrobiological Research and Dept. of Theoretical Production Ecology. Wageningen. The Netherlands. 25 pp.
Drenth, H., H.F.M. ten Berge & J.J.M. Riethoven (Eds.), 1994. ORYZA simulation modules for potential and nitrogen limited rice production. SARP Research Proceedings. AB-DLO/Wageningen, WAU-TPE/Wageningen, IRRI/Los Banos. 223 pp.

V. Further information in the World-Wide-Web

VI. Additional remarks

Parentage: MACROS -L1D and SUCROS .
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Status of the document:
last modified by Joachim Benz Mon Jul 2 18:31:37 CEST 2007

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