[Q] Soil layer options

There are 3 methods of dealing with soil layers in DSSAT, controlled by MESOL in simulation controls:

  • MESOL = 1: old DSSAT method of forcing soil layer thicknesses to be 5, 10, 15, 15, 15, 30, 30, 30, 60, 60, 60 cm thick. Soil properties are blended when user input layers are forced to standard thicknesses.
  • MESOL = 2: default method in current CSM. The top two layers are forced to 5 and 10 cm for computational stability in the drainage routines. The remaining layers are, if too thick, split into 2, 3, or 4 homogeneous layers. No blending of soil properties is done except possibly in the top two layers.
  • MESOL = 3: no change to user’s input for soil layer thicknesses. This may cause instabilities with the drainage routines if the layers are too thick or too thin.

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