1. General Model Information

Name: Soybean Crop Simulator

Acronym: SOYCROS

Main medium: terrestrial
Main subject: biogeochemistry
Organization level: ecosystem
Type of model: compartment model
Main application:
Keywords: crop growth, soybean, canopy photosynthesis, water uptake, crop development,leaf area growth, flow of water in soil, crop organ weight, leaf area, soil water content, seed germination status


Prof. Dr. F.W.T. Penning de Vries
Research Institute for Agrobiology and Soil Fertility (AB-DLO)
Dept. Agrosystems Research
P.O.Box 14
6700 AA Wageningen
Phone: +31.8370.75960
Fax : +31.8370.23110
email: pdvries@ab.agro.nl



SOYCROS is a summary model to simulate growth and production of soybean varieties. It is based on crop physiology, agrometeorology and soil physics, with additions pertaining to water stress and functioning of roots. il, daily rates of crop photosynthesis, respiration, carbohydrate partitioning, phenological development, transpiration, and of infiltration, drainage and movement of water in the soil are calculated in relation to the status of the crop, the soil water and current weather conditions. Nitrogen balance processes are not explicitly simulated. Rates are integrated at the end of each day to update the weight of the crop organs and the water contents of the soil layers. The cycle is repeated until the end of the growing season is reached. The following items were added: - There is a choice of four crop management situations: rainfed and irrigated upland, and rainfed and irrigated lowland. - Simulation starts at the beginning of the turn around period. - Germination simulated in relation to soil moisture. - The effect of N-redistribution on photosynthesis is included. - After-effect of severe water stress is included. - Effect of anaerobiosis in the root environment is simulated. After simulation, a spreadsheet is used with fixed prices and costs to compute net returns.

Author of the abstract:

CAMASE (Concerted Action for the development and testing of quantitative methods for research on Agricultural Systems and the Environment):

II. Technical Information

II.1 Executables:

Operating System(s): PC 286 or more

II.2 Source-code:

Programming Language(s): CSMP [other software required: Microsoft Excel if spreadsheet is used]

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

Penning de Vries, F.W.T., J. Timsina, M.J.C. Alagos, L. Velasco & R.K. Pandey, 1992.
Opportunities for soya beans after rice in the Philippines: an exploration by simulation.
CABO-DLO, Simulation Report 25, November 1992,60 pp.

V. Further information in the World-Wide-Web

VI. Additional remarks

Ground water dynamics plays a crucial role

CAMASE(Concerted Action for the development and testing of quantitativemethods for research on Agricultural Systems and the Environment):

Last review of this document by: T. Gabele: 08. 07. 1997 -
Status of the document:
last modified by Joachim Benz Mon Jul 2 18:31:37 CEST 2007

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