c     file: cfert.inc

c     This file contains the declaration of the common block of variables
c     related to plant N & P uptake.

c     Parameter include files:  p1werm.inc

c     + + + VARIABLE DECLARATIONS + + +

      real      ap(mnsz),
     r          als(mnsz),
     r          bk(mnsz),
c     real      bn1, bn2, bn3, bn4, bp1, bp2, bp3, bp4
     r          fn,
     r          fp,
     r          op(mnsz),
     r          pmn(mnsz),
     r          sn,
     r          sp,
     r          sunn,
     r          sup,
     r          un(mnsz),
     r          un1,
     r          un2,
     r          uno3,
     r          up1,
     r          up2,
     r          upp,
     r          up(mnsz),
     r          wno3(mnsz)

      common /fert/ ap,
     &              als,
     &              bk,
c    &              bn1, bn2, bn3, bn4, bp1, bp2, bp3, bp4,
     &              fn,
     &              fp,
     &              op,
     &              pmn,
     &              sn,
     &              sp,
     &              sunn,
     &              sup,
     &              un, un1, un2, uno3,
     &              up1, up2, upp, up,
     &              wno3

c     + + + VARIABLE DEFINITIONS + + +
c     als - aluminum saturation of the soil (%)
c     ap - total available P in a layer from all sources (kg/ha)
c     bk - flow coefficient between active and stable P pools (1/d)
c     bn - N uptake parametres at different stages of growth(ratio)
c     bp - P uptake parametres at different stages of growth(ratio)
c     fn - amount of fertilizer N applied at planting (kg/ha)
c     fp - amount of fertilizer P applied at planting (kg/ha)
c     pmn - amount of active mineral P pool (kg/ha)
c     op - amount of stable mineral P pool (kg/ha)
c     sn - nitrogen stress factor
c     sp - phosphorous stress factor
c     sunn - sum of soil supplied N from all rooted layers (kg/ha/d)
c     sup - sum of soil supplied P from all rooted layers (kg/ha/d)
c     un - amount of N supplied by a rooted soil layer (kg/ha/d)
c     un1 - actual crop N concentration (kg/ha/d)
c     un2 - optimal crop N concentration (kg/ha/d)
c     uno3 - N demand rate by the crop (kg/ha/d)
c     up - amount of P supplied by a rooted soil layer (kg/ha/d)
c     up1 - actual crop P concentration (kg/ha/d)
c     up2 - optimal crop P concentration (kg/ha/d)
c     upp - N demand rate by the crop (kg/ha/d)
c     wno3 - total available N in a layer from all sources (kg/ha)