Mehdi,

Those two are warnings, but should not stop the model from running.  It will just use TAVE of 20 and TAMP of 5C, which may incorrectly affect germination and growth until the V5 stage of maize.  You should put the correct TAVE and TAMP in the header of the weather file.

As for not running, I don't know why.  This is just an error message.  So something else is wrong.  Do you really have a good weather file at all?  The problem is with the weather file.  IPWTH is the module that reads weather.

Ken Boote

-----Original Message-----
From: DSSAT - Crop Models and Applications [mailto:[log in to unmask]] On Behalf Of mehdi mahbod
Sent: Thursday, August 19, 2010 4:08 AM
To: [log in to unmask]
Subject: Dssat run

Dear all
I have prepared my input files ( soil, weather, experiment). and i try to run the Cerez-Maize model in DSSAT 4. but unfurtunately with out any errors, the model does not run and in the related folder i just have header,list, warning and wether. Here is the warnings in the  warning file:

*WARNING DETAIL FILE
******************************************************************************
*DSSAT Cropping System Model Ver. 4.0.1.000               Aug 19, 2010; 12:25:04
*RUN   1        : sim12
 MODEL          : MZCER040 - Maize
 EXPERIMENT     : DAB10801 MZ    NEHZATI1
 TREATMENT 12   : sim12
 IPWTH
  Value of TAV, average annual soil temperature, is missing.
  A default value of 20.0ºC is being used for this simulation,
  which may produce undesirable results.

 IPWTH
  Value of TAMP, amplitude of soil temperature function, is missing.
  A default value of  5.0ºC is being used for this simulation,
  which may produce undesirable results.

please let me know what would be the problem and i will check it,