Hello Alex,

genetic coefficients are site and sometimes even season-specific.
I would therefore strongly recommend to calibrate CERES-Wheat
with your local data. They have to be derived under known
none-stress conditions. The procedures are described in the
manual.

Good luck,
Matthias Langensiepen





On 8 May 2003 at 22:11, Alex Moreno S. wrote:

> Dear list members,
>
> I have been using CERES-Wheat to simulate yield components of cultivar Newton in Kansas, USA. Simulated Kernels per area and grain yield are satisfactory, but while there is a clear variation in observed kernel weight simulated kernel weight is a constant value (a horizontal line in the
Simulated vs Observed figure). Has anyone else seen this response?
>
> For the simulations I have used the genetic coefficients found in Tsuji, Jones & Balas (eds.). 1994. DSSAT version 3, Vol. 2. Univ. Hawaii, and also included in file Whcer940.cul:
>
> P1V:  6.0
> P1D: 2.5
> P5:    3.5
> G1:   3.4
> G2:   2.6
> G3:   1.4
> PHINT: 95.00
>
> Has anyone else used/tested these coefficients for Newton? Has anyone else determined a “revised” set of coefficients?
>
> Thanks for your time and comments.
>
> Regards,
>
> Alex
>
> -----------------------------------
> Alex Moreno Sotomayor
> Graduate Research Assistant
> 236 L.W. Chase Hall / PO Box 830728
> School of Natural Resource Sciences
> University of Nebraska - Lincoln
> Lincoln NE 68583-0728
> Fax (402) 472-6614
> -----------------------------------