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DSSAT
Cropping System Model
101
March 25, 2014
IFDC, Muscle Shoals, AL
Cheryl Porter
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Modular Structure
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Modular Structure
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Modular Structure
• DYNAMIC variable is used to control
processing
• DYNAMIC is a component of the composite
CONTROL variable
• Example SoilKi.for
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Module Functions
Each module should:
1. Read its own parameters (see IP* routines);
2. Initialize its own variables;
3. Accept variables passed to it from other modules and the
environment ;
4. Pass variables that are computed within the module;
5. Own its set of state variables;
6. Compute rates of change for its state variables;
7. Integrate its state variables;
8. Write its own variables as output (see OP* routines); and
9. Operate when linked to a dummy test program.
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Method 1:
Explicitly pass
variables thru
argument lists
Passing variables around
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Modular Structure
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Passing variables around
• Method 2: Composite variables
– ModuleDefs.for
• Method 3: Global constants
– ModuleDefs.for
• Method 4: GET and PUT routines
– CROPGRO.FOR &
ETPHOT.FOR
• Method 5: (Avoid!)
COMMON blocks
– COMGEN.BLK &
IPVAR.FOR
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Versioning
• ModuleDefs.for
• Each output file is branded with the model
version and build number and the
development branch
*GROWTH ASPECTS OUTPUT FILE
*DSSAT Cropping System Model Ver. 4.6.0.025 -develop DEC 08, 2013; 19:40:33
*RUN 1 : Sprinkler IR, 0 kg N/ha SGCER046 CSKU8201 1
MODEL : SGCER046 - Grain sorghum
EXPERIMENT : CSKU8201 SG KUNNUNURRA IRRIGATION EXP 1982
DATA PATH : C:\DSSAT45\Sorghum\
TREATMENT 1 : Sprinkler IR, 0 kg N/ha SGCER046
!
!
@YEAR DOY DAS DAP L#SD GSTD LAID LWAD SWAD GWAD RWAD VWAD CWAD
1982 146 2 0 0.0 0 0.00 0 0 0 0 0 0
1982 147 3 1 0.0 0 0.00 0 0 0 0 0 0
1982 148 4 2 0.0 0 0.00 0 0 0 0 0 0
1982 149 5 3 0.0 0 0.00 0 0 0 0 0 0
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Common utilities
• ModuleDefs.for (data types, GET, PUT, …)
• Date utilities (DATES.for)
• Message reporting (INFO, WARNING, ERROR)
• Input module
• Generic outputs (File headers, Summary,
Overview)
• File reading utilities (READS.for)
• Generic utilities (UTILS.for)
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Coding code of conduct
• Documentation
• Development branch branding (outputs linked
to version and branch)
• Use existing utilities as much as possible
(rather than add new code for existing
functions)
• TESTING!