The Canadian

Centre for Environmental Modelling and Chemistry

Soil Model

The Soil model, written in BASIC, gives a very simple assessment of the relative potential for degrading reaction, evaporation, and leaching of a pesticide applied to a surface soil.

A more detailed description is included in the book "Multimedia Environmental Models; The Fugacity Approach" by D. Mackay, Lewis Publishers, CRC Press. 1991 on pages 193-198.

The SoilFug model is a friendlier alternative for Windows users.

The required input data are:
Chemical Properties:

  • chemical name
  • temperature
  • molecular mass
  • water solubility
  • vapour pressure
  • organic carbon partition coefficient, Koc
  • mineral-water partition coefficient
  • degradation half-life


  • chemical dosage

    • Soil Properties:

  • soil area and depth
  • mean vertical diffusion distance from middle of soil layer to surface
  • volume fractions of air and water
  • mass fraction of organic carbon
  • leaching rate

    • Model output includes:

  • system fugacity
  • Z and D values
  • fluxes
  • concentrations and amounts in each compartment
  • residence times

    • System requirements to run the compiled program are minimal.

    Please read the SOIL SOFTWARE LICENSE before downloading the software. Use of the software constitutes your agreement to abide by the terms and conditions set out in the license agreement.

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    Last updated October 29, 2008.