Dear Dr. Hasegawa
 
This is a side comment about your question relating to soil temperature with
CERES:
I've had a rather positive experience using a modified (and slightly more
complex) version
of the CERES routine developed and published by Hoffmann et al.  [Soil
temperature model for CERES and similar crop models, J. Agron. and Crop Sci.
170:56-65, 1993], from the
University of Kiel, Germany,
I may forward you the corresponding source code if you wish.
With this version, which explicitly implements a Fourier's conduction equation
within
the soil matrix, I obtained root mean square errors of  1 to 2 °C against daily
observations
in several locations in France and in Denmark.Coming back to Ken Boote's
comment, I must admit that in these instances I've used theTAVE and AMP value
of the particular year I was simulating (which makes it easier for the model
to calculate the correct temperature waveform at the bottom of the soil
profile).
The inputs are essentially unchanged compared to the original CERES, except for
a yearly
averaged soil moisture content and thermal conductivity at the bottom of the
profile; using
the field-capacity  content for the former and a constant, default value for
the latter is
generally good enough.
 
Regards,
 
Benoit Gabrielle
 
 
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> Dear DSSATers,
>
> 1) The soil temperature submodel which originates from Williams et al (1984)
> is commonly used in the CERES models. Is there any test of the soil
> tempearture submodel by a third person?
>
> 2) Minor but signicant number of modifications were made since the original
> CERES -maize and -wheat models had published in 1986 . You can tell what
> modified in N transformations, nitrate leaching and phasic development
> between 1986 and 1991 by "Modeling Plant and Soil Systems" published in 1991
> by the ASA, were described. But, except this publication, I don't know any
> source of modifications. Does anyone know other publications which account
> for modifications in the CERES models?
>
> Thanks,
>
> Hiroshi Hasegawa
> Agronomist
> Tohoku National Agricultural Experiment Station
> Division of Upland Farming
>   960-2156
>   Fukushima-shi, Arai, Aza harajuku-minami 50
>   JAPAN
>   Phone; 81-24-593-5151
>   FAX  ; 81-24-593-2155
>   Email; [log in to unmask]