1. General Model Information

Name: Crop Growth Simulation


Main medium: terrestrial
Main subject: biogeochemistry
Organization level: ecosystem
Type of model: ordinary differential equations
Main application:
Keywords: education, crop growth, canopy photosynthesis, crop development


Ir. B.O.M. Dirks
Wageningen Agricultural University
Dept. Theoretical Production Ecology
P.O.Box 430
6700 AK Wageningen
Phone: +31.8370.84769
Fax : +31.8370.84892

Dr.ir. E.A. Lantinga
Wageningen Agricultural University
Dept. Theoretical Production Ecology
P.O.Box 430
6700 AK Wageningen
Tel. +31.8370.83915
Fax +31.8370.84892
Email: tpelantinga@rcl.wau.nl



CROP ECOLOGY is a specifically for educational purposes developed version of the SUCROS* crop growth model. It calculates canopy photosynthesis and crop growth and development of several crops. It uses crop physiological and ecological processes as function of environmental (soil and climate) and plant conditions. Through an interface the user supplies the following input: (1) production level: (1) potential production (growth and development determined by radiation, temperature and crop characteristics) or (2) water-limited production (growth and development determined by radiation, temperature, water availability, crop evapotranspiration and crop characteristics); (2) crop: spring wheat, winter wheat, maize (early, late and tropical cultivar), potato (early and late cultivar), sugarbeet, oil-seed rape, soybean, rice (different numbers of days in seedbed before transplanting), tulip or faba bean; (3) weather data: standard data for Finland, India, Israel, Italy, Kenya, The Netherlands or Philippines, or alternative data; (4) soil (only for production level 2): coarse sand, fine sand, loam, sandy clay loam, clay loam, light clay, heavy clay or peat; (5) a shift of the radiation profile; (6) a shift of the temperature profile; (7) irrigations of 25 mm each on specified days (only for production level 2); (8) maximum gross CO2 assimilation rate; (9) initial light use efficiency; (10) maximum rooting depth (only for production level 2); (11) Q10; (12) maintenance coefficients; (13) conversion factor of storage organs; (14) extinction coefficient; (15) plant density); and (16) day of emergence. The user can obtain tabular and graphical output for different output variables.

Author of the abstract:
CAMASE Register of Agro-ecosystems Models

II. Technical Information

II.1 Executables:

Operating System(s): IBM compatible PC, internal memory 512 Kb or more, MS-DOS 3.2 or moreExecutable available: Yes. User contract mandatory: Yes. Costs: 1000 ECU, exclusive VAT

II.2 Source-code:

Programming Language(s): TenCore.

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

Rate variables:
Above ground: development rate, leaf and canopy photosynthesis (gross andnett), maintenance and growth respiration, organ growth, evaporation, transpiration;
Below ground:root extension.
Number of rate variables: > 50.
State variables:
Above ground: organ weight, leaf area index, development stage, absorbedradiation;
Below ground: rooting depth.
Number of state variables: 50.

III.2.1 Input

Input data: Plant and soil characteristics, latitude, daily irradiance, minimum and maximumtemperature, precipitation, vapour pressure and wind speed.
Number of input data: 50.

III.2.2 Output

Output data: Irradiance, absorbed radiation, total weight, storage organ weight, precipitation,potential and actual evapotranspiration, CO2 assimilation, maintenance respiration, leaf area index,growth rate, growth rate storage organ, temperature, rooting depth, development stage.
Number of output data: 15.
Time interval of simulation: 1 day.
Basic spatial unit: Typically 1 km2.

IV. References

Courseware Midden Nederland b.v., 1993. Crop Ecology - Crop Growth Simulation. Utrecht, Courseware MiddenNederland b.v. 31 pp.

V. Further information in the World-Wide-Web

VI. Additional remarks

Last review of this document by: T. Gabele: 20. 6. 1997 -
Status of the document:
last modified by Joachim Benz Mon Jul 2 18:31:37 CEST 2007

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