Dear Hiroshi:

I'm not a CERES developer, but CERES being an RUE-to-dry-matter model does
not distinquish between different compositions of seed.  It may have a
minor impact, if the model allows variable seed composition (which I don't
think it does) and if a high N composition seed could create higher demand
for N, and if the N is not available.  But it does not handle respiratory
costs of N uptake and assimilation.  The ORYZA-rice (from SUCROS) model may
do it, but ask Martin Kropff.

The CROPGRO models will do what you want, but there is not a CROPGRO-rice
model

Ken Boote
Univ. of Florida


At 03:32 PM 10/18/1999 +0900, you wrote:
>Dear DSSATers,
>
>Usually plants take up and assimilate inorganic soil N by consuming
>additional carbohydrates. In the CERES models (version 3.0), is this taken
>into account? In other words, can the CERES models simulate differences of
>grain yield between high and low protein cultivars?
> If so, in which submodel is this written?
>
>Sincerely,
>
>
>Hiroshi Hasegawa
>
>Division of Upland Farming
>Tohoku National Agricultural Experiment Station
>  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]
>  http://ss.fk.affrc.go.jp/kenkyuu/sakutuke/hasegawa/