Ulrich,

Good question. Unfortunately DSSAT requires that the entire simulation
control section for one level is kept together and then repeated for the
second and following levels.  There are ample examples in the
experimental data files that are distributed with DSSAT, especially in
the Seasonal and Sequence/Crop rotation directory.

Regards,

Gerrit


-------- Original Message --------
Subject:        Multiple simulation controls in File X
Date:   Fri, 11 May 2012 09:12:34 -0500
From:   Kleinwechter, Ulrich (CIP) <[log in to unmask]>
To:     <[log in to unmask]>



Dear all,



I wondered a little bit about the best way to introduce multiple
variants of simulation controls in a File X. Suppose, we have two
treatments. Each treatment is to be simulated with slightly different
simulation controls. The way I've found this to be introduced into the
File X looks something like this:



@N GENERAL     NYERS NREPS START SDATE RSEED SNAME....................
SMODEL

1 GE              1     1     S 04061  2150 2004-1 DEFAULT

@N OPTIONS     WATER NITRO SYMBI PHOSP POTAS DISES  CHEM  TILL   CO2

[...]



@N GENERAL     NYERS NREPS START SDATE RSEED SNAME....................
SMODEL

2 GE              1     1     S 04245  2150 2004-2 DEFAULT

@N OPTIONS     WATER NITRO SYMBI PHOSP POTAS DISES  CHEM  TILL   CO2

[...]



I.e. the headers are repeated for each treatment.



A possibility to arrange everything more clearly would be to put all
treatments under a single header:



@N GENERAL     NYERS NREPS START SDATE RSEED SNAME....................
SMODEL

1 GE              1     1     S 04061  2150 2004-1 DEFAULT

2 GE              1     1     S 04245  2150 2004-2 DEFAULT

@N OPTIONS     WATER NITRO SYMBI PHOSP POTAS DISES  CHEM  TILL   CO2

[...]



In that case, however, DSSAT gives an error message



IPSIM   YEAR DOY =    0   0

Invalid format in file.


  File: CIKABCHK.PTX


     Line:   107


     Error key: IPSIM


  Simulations terminated.



This points me to one of the three problems

IPSIM 1     Simulation control section not found. Please add to input
file.

IPSIM 2     Incorrect number of lines in simulation control section.
Check format.

IPSIM 3     Impossible combination--for MEEVP='Z', MEPHO must be 'L'.



DSSAT seems to have a problem with multiple lines under each header of
the simulations control section. I wonder whether there is any reason
why one cannot summarize all versions of the simulation control under
single headers. It works flawlessly for all other sections of the File
X.



Being able to write multiple lines under a single header would greatly
facilitate the work with the File X.



Thank you very much for your support,



Ulrich





Ulrich Kleinwechter I Agricultural Economist
Social and Health Sciences Program

International Potato Center




--

Gerrit Hoogenboom
Director, AgWeatherNet, and
Professor of Agrometeorology

Washington State University
24106 North Bunn Road
Prosser, Washington  99350-8694, USA
1-509-786-9371; Fax: 1-509-786-9370
[log in to unmask]
www.weather.wsu.edu