Hi Arjan,

Thank you for your so quick and kind response. If you are so busy
please forget about CropTest and let me ask you only about changing
composition of organic matter inputs with DSSAT version 4.0.
  With METHOD=G (CERES-based option), I ran simulations for
incorporation of legume cover crop residue and cattle compost with
the default and measured composition. In SOILN040.SOL I defined the
composition as below. But, I could not see RE001 to RE008 options in
fileX (MZX) from XBuild, and therefore I edited the fileX with
Notepad. I chose RE005 for compost and RE008 for legume. Nonetheless,
N mineralization between default and measured composition was
identical. Something wrong with me?
__________________________
           CARB CELL LIGN
RE001     0.20 0.70 0.10
(default)
RE005     0.22 0.49 0.29
(measured for compost)
RE008     0.43 0.52 0.05
(measured for legume)

Cheers,

Hiroshi

>Concerning your follow-up question:
>1. Yes, you can run the same fileX for both versions, but note that with
>v4.0 there is a switch MESOM on the METHODS line for which SOM module to
>use: MESOM = P for CENTURY, MESOM = G for CERES.
>2. Yes, but also try the CENTURY-based SOM/residue module!
>3. I am sorry, I have hardly worked with DSSAT4 and therefore never looked
>at CropTest, as I am full time busy with developing the next DSSAT version
>(which will incorporate a P module), but I will ask someone who does know
>and then let the list know.