Dear Hiroshi Hasegawa:
 
I believe Dr. Bill Batchelor or one of his students has been evaluating the
soil temperature submodel presently used in CERES models.  His email is
[log in to unmask]
 
Their conclusion is that there are better algorithms for predicting soil
temperature and they tested some alternatives.  One of the problems is that
the  program requires TAVE and TAMP entered in the weather file.  These
entries are sometimes not available or are just plain wrong, also depending
on correct computation by the WEATHERMAN program.
 
We have had some bad experiences with this in Iowa, Spain, and Egypt,
because people were just ignoring this requirement or quality of TAVE and
TAMP in the weather files.  These were aside from whether the method is
good.  So beware.
 
Ken Boote
 
 
At 11:52 AM 9/5/98 +0900, you wrote:
>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]
>