I think you can't use the same values of cultivar coefficients in
DSSAT V4.0and DSSAT
V3.5 and may also of V 3.0, because in V3.5 these coefficients are in scalar
values, to use them in DSSAT V 4.0 you have to convert them first in the
units in which DSSAT V4.0 took the values, conversion factors are given in
DSSAT V4.0 cultivar file.

Best wishes

Humaira


On 4/13/06, William W. W. Wong <[log in to unmask]> wrote:
>
> Dear Xiong Wei,
>
> I find similar problem when I used DSSAT Ver 4. The yields are lower than
> that simulated with Ver. 3.0, using the same genotype coefficients. I
> wondered why this is so? So far, no one has responded yet. Have you got in
> touch with Upendra Singh?
>
> Hope this can be explained.
>
>
> William
>
>
> ----- Original Message -----
> From: "xiongw" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Monday, April 10, 2006 9:43 AM
> Subject: cultivar coefficients
>
>
> > Dear Colleagues
> >
> > I used the same cultivar coefficients and same experiment file for rice
> in
> both DSSAT35 and DSSAT35, but the different simulated yield and other
> rusults were generated, the yields simulated by dssat4 are low than
> simulated by dssat35. Anyone know what's matter with this problem? is
> there
> some changes for cultivar coefficients of RICE model in DSSAT4?
> >
> > Thanks in advance
> >
> > Xiong Wei
>



--
Humaira Sultana
Research Felllow
Global Change Impact Studies Centre
1st Floor, Saudi Pak Tower, Jinnah Avenue, Blue Area,
Islamabad, Pakistan.
Ph: 92-51-9219785
Fax:92-51-9219787