Hiroshi,


Sorry, I cannot check what is going on, as my DSSAT freaks out if I only
look at it (and by now I go wild also.......). I want to have clean list of
fileX's, weather and soil files (because I have been playing around with
them so much), so I installed the program anew, but for whatever reason it
did not install the soil files completely and there was no SOILN030.SOL, so
I reinstalled it another time (with the same result). By the way, you write
about SOILN040.SOL:, but isn't it 030 in the released DSSAT4 version (with
the version under development we are already at 050)? Having the filename
wrong may explain why it does not respond to differences between RE005 and
RE008, as it uses the default option then (I think) and thus all are going
to be the same.

Editing the file with Notepad should go fine; I use an editor all the time
for fileX, *.WTH, SOIL.SOL, SOMFIX_C.SOL, etc. But please do realize that if
you are not 100% sure what you are doing, then stay away from it, as many
files are strict on how the precise layout should be (shift a parameter one
position and it does not work), so always keep the --unedited-- original as
reference point.

Hope this is of any help.

Maybe someone else can fillow up whether it is indeed SOILN030 or SOILN040.


Arjan Gijsman


-----Original Message-----
From: [log in to unmask] [ mailto:[log in to unmask]
<mailto:[log in to unmask]> ]
Sent: Saturday, December 25, 2004 8:39 PM
To: [log in to unmask]
Subject: Changing composition of organic matter inputs


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.