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Main.for
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**************************************************************************
**************************************************************************
* DRIVER for the MODEL TO SIMULATE CROP GROWTH SUBJECTED TO
* DAILY VARIATIONS OF WEATHER AND SOIL WATER CONDITIONS
* Written in Microsoft FORTRAN for PC-compatible machines
* Authors: RICARDO BRAGA and JADIR ROSA
* Obs: This program is an assignment of the course AGE 5646-Agricultural
* and Biological Systems Simulation.
* Date: 03/31/1997
* Modified 7/99 CHP - modified modular format, revised output format,
* modified soil water routines, added water balance
C*************************************************************************
*
* LIST OF VARIABLES
*
* DOY = Julian day
* DOYP = date of planting (Julian day)
* endsim = code signifying physiological maturity (end of simulation)
* FROP = frequency of printout (days)
* IPRINT = code for printout (=0 for printout)
* LAI = canopy leaf area index (m2 m-2)
* PAR = photosynthetically active radiation (MJ/m2/d)
* RAIN = daily rainfall (mm)
* SRAD = daily solar radiation (MJ/m2/d)
* SWFAC1 = soil water deficit stress factor
* SWFAC2 = soil water excess stress factor
* TAIRHR = hourly average temperature (Celsius)
* TMAX = daily maximum temperature (Celsius)
* TMIN = daily minimum temperature (Celsius)
*
***********************************************************************
PROGRAM MAIN
!-----------------------------------------------------------------------
USE DFLIB
IMPLICIT NONE
REAL LAI, SWFAC1, SWFAC2
REAL SRAD, TMAX, TMIN, PAR, RAIN
INTEGER DOY,DOYP, endsim
INTEGER FROP, IPRINT
!************************************************************************
!************************************************************************
! INITIALIZATION AND INPUT OF DATA
!************************************************************************
CALL OPENF(DOYP, FROP)
CALL WEATHR(SRAD,TMAX,TMIN,RAIN,PAR,'INITIAL ')
CALL SW(
& DOY, LAI, RAIN, SRAD, TMAX, TMIN, !Input
& SWFAC1, SWFAC2, !Output
& 'INITIAL ') !Control
CALL PLANT(DOY, endsim, TMAX, TMIN, !Input
& PAR, SWFAC1, SWFAC2, !Input
& LAI, !Output
& 'INITIAL ') !Control
!-----------------------------------------------------------------------
! DAILY TIME LOOP
!-----------------------------------------------------------------------
DO 500 DOY = 0,1000
IF (DOY .NE. 0) THEN
CALL WEATHR(SRAD,TMAX,TMIN,RAIN,PAR,'RATE ')
!************************************************************************
!************************************************************************
! RATE CALCULATIONS
!************************************************************************
CALL SW(
& DOY, LAI, RAIN, SRAD, TMAX, TMIN, !Input
& SWFAC1, SWFAC2, !Output
& 'RATE ') !Control
IF (DOY .GT. DOYP) THEN
CALL PLANT(DOY, endsim,TMAX,TMIN, !Input
& PAR, SWFAC1, SWFAC2, !Input
& LAI, !Output
& 'RATE ') !Control
ENDIF
!************************************************************************
!************************************************************************
! INTEGRATION OF STATE VARIABLES
!************************************************************************
CALL SW(
& DOY, LAI, RAIN, SRAD, TMAX, TMIN, !Input
& SWFAC1, SWFAC2, !Output
& 'INTEG ') !Control
IF (DOY .GT. DOYP) THEN
CALL PLANT(DOY, endsim, TMAX,TMIN, !Input
& PAR, SWFAC1, SWFAC2, !Input
& LAI, !Output
& 'INTEG ') !Control
ENDIF
ENDIF
!************************************************************************
!************************************************************************
! WRITE DAILY OUTPUT
!************************************************************************
IPRINT = MOD(DOY, FROP)
IF ((IPRINT .EQ. 0) .OR. (endsim .EQ. 1) .OR.
& (DOY .EQ. DOYP)) THEN
CALL SW(
& DOY, LAI, RAIN, SRAD, TMAX, TMIN, !Input
& SWFAC1, SWFAC2, !Output
& 'OUTPUT ') !Control
IF (DOY .GE. DOYP) THEN
CALL PLANT(DOY, endsim, TMAX,TMIN, !Input
& PAR, SWFAC1, SWFAC2, !Input
& LAI, !Output
& 'OUTPUT ') !Control
ENDIF
ENDIF
IF (ENDSIM .EQ. 1) EXIT
!-----------------------------------------------------------------------
! END OF DAILY TIME LOOP
!-----------------------------------------------------------------------
500 ENDDO
!************************************************************************
!************************************************************************
! CLOSE FILES AND WRITE SUMMARY REPORTS
!************************************************************************
CALL WEATHR(SRAD,TMAX,TMIN,RAIN,PAR,'CLOSE ')
CALL SW(
& DOY, LAI, RAIN, SRAD, TMAX, TMIN, !Input
& SWFAC1, SWFAC2, !Output
& 'CLOSE ') !Control
CALL PLANT(DOY, endsim, TMAX,TMIN, !Input
& PAR, SWFAC1, SWFAC2, !Input
& LAI, !Output
& 'CLOSE ')
PAUSE 'End of Program - hit enter key to end'
!-----------------------------------------------------------------------
STOP
END PROGRAM MAIN
****************************************************************************
************************************************************************
* SUBROUTINE OPENF(DOYP)
* This subroutine opens the simulation control file, and reads date of
* planting (DOYP)
*
* SIMCTRL.INP => date of planting, frequency of printout
************************************************************************
SUBROUTINE OPENF(DOYP, FROP)
IMPLICIT NONE
INTEGER DOYP, FROP
OPEN (UNIT=8, FILE='SIMCTRL.INP',STATUS='UNKNOWN')
READ(8,5) DOYP, FROP
IF (FROP .LE. 0) FROP = 1
5 FORMAT(2I6)
CLOSE(8)
!-----------------------------------------------------------------------
RETURN
END SUBROUTINE OPENF
************************************************************************
************************************************************************