1. General Model Information

Name: SIBIL - Simulare BILant (Balance Simulation - in Romanian).

Acronym: SIBIL


Main medium: terrestrial
Main subject: agriculture, hydrology, soil science
Organization level: ecosystem, population
Type of model: partial differential equations (finite differences)
Main application:
Keywords: crop, soil, root-soil-interactions, water dynamics, crop growth, penetration resistance, richards equation

Contact:

MSci H.T.C. Simota.
Research Institute of Soil Science and Agro-chemistry (RISSA), Dept. of Soil Physics, Blvd. Marasti 61, R-71331 Bucharest, ROMANIA.
Phone: +40.1.2225979
Fax: +40.1.2225979
email: icpa@u1.ici.ro

Author(s):

Abstract:

The model describes dynamics of soil water and the crop yield formation. The production system is defined by crop species, soil type, hydrologic conditions and weather during the growing season. The SIBIL model is designated for calculating the effect of soil water balance and soil mechanical resistance on agricultural production potential for selected crop-soil-climate combinations. The model allows to evaluate the relative importance of principal soil physical properties to crop production. The dynamics of the root system is related to soil water content and soil resistance to penetration, the model having the ability to estimate the root density profile in soils with compact layers. The biomass production algorithm uses the water use efficiency. The simulation model SIBIL has 8 subsystems (blocks) which simulate the main processes involved in soil water dynamics and crop yield formation. Each subsystem is characterized by a number of processes which describe time- (and eventually space-) dependence of corresponding state variables. As optional tools are included a weather daily data generator (using monthly averages of air temperature and precipitation) and an algorithm for the evaluation of the pedotransfer functions using soil data obtained in simple soil survey studies (texture, bulk density, organic carbon).

Purpose of the model:

Model parentage: SIBIL uses algorithms developed in SWATRE and ARIDCROP models.

Source of the AbstractCAMASE Register of Agro-ecosystems Models


II. Technical Information

II.1 Executables:

Operating System(s): IBM-PC compatible with a 286 processor or better, math co-processor is highly recommended.
Contract necessary:
Costs: : No.
Comments:

II.2 Source-code:

Programming Language(s): QuickBasic.

II.3 Manuals:



II.4 Data:



III. Mathematical Information


III.1 Mathematics


III.2 Quantities

Rate variables: Potential / actual evaporation and transpiration, actual infiltration rate, runoff, water fluxes between soil layers, soil water root sink rate, drainage.

State variables: Air temperature, soil water matric potential, soil resistance, dry matter (total and per plant organ), water use efficiency, cumulated transpiration deficit, root front depth.

III.2.1 Input

Soil physical properties per layer, standard meteorological variables, initial soil water content, crop type and cultivar, sawing date and depth. Input check in model: No.

III.2.2 Output

Soil water profile dynamics, biomass per plant organs, crop yield, root system development, water balance elements (evaporation, transpiration, drainage, runoff).
Basic spatial unit: Ha.
Time interval of simulation: 1 Day for plant processes, 0.1 day for soil water balance calculation.

IV. References


Simota, C., 1992. SIBIL - a simulation model for soil water dynamics and crop yield formation. RISSA internal report. 55 pp.

Simota, C. & A. Canarache, 1988. Effects of induced compaction in soil water balance and crop yields estimated with a deterministic simulation model. Proceedings XI ISTRO Conference, Edinburgh. 391-396
Simota, C., J. Lipiec & S. Tarkiewicz, 1989. Validation of the simulation model SIBIL for soil water dynamics and crop yield formation in an experiment concerning induced soil compaction. Proceedings International Conference "Soil Compaction as a Factor Determining Plant Productivity", Lublin, Poland. 140-141

Simota, C. & A. Canarache, 1988. Effects of induced compaction in soil water balance and crop yields estimated with a deterministic simulation model. Proceedings XI ISTRO Conference, Edinburgh. 391-396
Simota, C., 1992. SIBIL - a simulation model for soil water dynamics and crop yield formation. RISSA internal report. 55 pp.


V. Further information in the World-Wide-Web


  • VI. Additional remarks

    Parentage: SIBIL uses algorithms developed in SWATRE and ARIDCROP models.
    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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