Hello Kendall,
In the experiment file (*.mzx) you can specify emergence date. In the
section *PLANTING DETAILS you indicate planting date (PDATE) and emergence
date (EDATE). The model simulates emergence in case this information is not
available. But if you know emergence dates in your experiments you better
reduce uncertainty associated with inputs.

Does this solve your problem, or still you need some fine tuning of genetic
coefficients?

Best regards,
Jon


Jon I. Lizaso
Universidad Politecnica de Madrid
Dpto. Produccion Vegetal: Fitotecnia
Senda del Rey s/n
28040 Madrid, SPAIN
Tel:  (+34) 91 452 4900 ext 1671
Fax: (+34) 91 544 9983
http://www.etsia.upm.es/GRUPOSINV/AgSystems/




-----Mensaje original-----
De: DSSAT - Crop Models and Applications [mailto:[log in to unmask]] En
nombre de Kendall DeJonge
Enviado el: Friday, July 24, 2009 12:04 AM
Para: [log in to unmask]
Asunto: CERES-Maize emergence calibration

Hello all,

I am a PhD student at Colorado State University using DSSAT and CERES-Maize
to evaluate limited irrigation of corn.  Model simulations I have created
generally agrees with observed data.  However, all growth parameters occur
approximately 6-10 days earlier in the model than observed, including
emergence, anthesis date, leaf #, LAI, etc.  I am curious if there are any
adjustments that can be made to the model to push emergence back to observed
dates.  Obviously, the planting date could be adjusted, but I am looking for
any in-model parameters that can be used for calibration.

Any help would be appreciated!   Thank you,

Kendall DeJonge

--
"Do.  Or do not.  There is no try."
-Yoda