c     ------------------------------------------------------------------
c     file 's1dbc.inc'

c     This common block contains the variables representing the soil
c     chemical properties in WERM for each soil layer.

c     Parameter include files:  p1werm.inc

c     + + + VARIABLE DECLARATIONS + + +

      real             as0ph(mnsz, mnsub)
      real             ascmg(mnsz, mnsub)
      real             ascna(mnsz, mnsub)
      real             asfcce(mnsz, mnsub)
      real             asfcec(mnsz, mnsub)
      real             asfesp(mnsz, mnsub)
      real             asfom(0:mnsz, mnsub)
      real             asfnoh(mnsz,mnsub)
      real             asfpoh(mnsz,mnsub)
      real             asfpsp(mnsz,mnsub)
      real             asfsmb(mnsz,mnsub)
      real             asftap(mnsz,mnsub)
      real             asftan(mnsz,mnsub)
      real             asmno3(mnsub)


      common / s1dbc /
     r                 as0ph, ascmg, ascna, asfcce, asfcec, asfesp,
     r                 asfom, asfnoh, asfpsp, asfpoh, asfsmb,
c     r                 asfom, asfsmb,
     r                 asftan, asftap, asmno3

c     + + + VARIABLE DEFINITIONS + + +


c     as0ph  - Soil layer pH

c              range values       min        max
c              ------------   ---------  ---------
c              fixed            0.0       14.0
c              typical        tmin       tmax
c              ------------   ---------  ---------

c            - This variable contains the soil pH for each of the
c              subregions.

c     ascmg  - Soil layer magnesium ion concentration (cmol/kg)

c              range values       min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------

c            - This variable contains the soil layer magnesium ion
c              concentration for each of the subregions.

c     ascna  - Soil layer sodium ion concentration (cmol/kg)

c              range values       min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------

c            - This variable contains the soil layer sodium ion
c              concentration for each of the subregions.

c     asfcec - Soil layer cation exchange capacity (cmol/kg)

c              range values       min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------

c            - This variable contains the soil layer cation
c              exchange capacity for each of the subregions.

c     asfcce - Soil layer calcium carbonate equivalent (dec %)

c              range values       min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------

c            - This variable contains the soil layer calcium
c              carbonate equivalent for each of the subregions.

c     asfesp - Soil layer exchangeable sodium percentage (dec %)

c              range values       min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------

c            - This variable contains the soil layer exchangeable
c              sodium percentage for each of the subregions.

c     asfom  - Soil layer organic matter content (Mg/Mg)

c              range values       min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------

c            - This variable contains the soil layer organic matter
c              content for each of the subregions.

c     asfnoh - Soil layer organic N content of the humus (mg/kg)

c              range values       min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------

c            - This variable contains the organic N content of the
c              humus for each of the subregions.

c     asfpoh - Soil layer organic P content of the humus (mg/kg)

c              range values       min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------

c            - This variable contains the organic P content of the
c              humus for each of the subregions.

c     asfpsp - Fraction of fertilizer P that is labile (dec.)

c              range values       min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------

c            - This variable contains the fraction of fertilizer P that
c              is labile by layer for each of the subregions.

c     asfsmb - Sum of bases (cmol/kg)

c              range values       min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------

c            - This variable contains the sum of bases by layer
c              for each of the subregions.

c     asftap - Soil layer available Phosphorus (kg/ha)

c              range values       min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------

c            - This variable contains the soil layer available Phosphorus
c              content from all sources for each of the subregions.

c     asftan - Soil layer available Nitrogen (kg/ha)

c              range values       min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------

c            - This variable contains the soil layer available Nitrogen
c              content from all sources for each of the subregions.

c     asmno3  - Amount of N03 Nitrogen applied as fertilizer (kg/ha)

c              range values       min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------

c            - This variable contains the NO3 Nitrogen applied as
c              fertilizer for each of the subregions.

c     ------------------------------------------------------------------