Dear All
If it is true that genetic coefficients
are cultivar but not environment specific,
a corresponding calibration procedure
would lead to the universal application
of the model for each particular cultivar.
There is experimental evidence that genetic
coefficients become site and even
season specific invalidating such
an assumption. I would therefore
strongly recommend to perform a thorough
site-specific calibration in each new
model application case following the
procedures outlined in the DSSAT
manuals.

Matthias Langensiepen
Modelling Plant Systems
Institute of Crop Science
Faculty of Agriculture and Horticulture
Humboldt-University of Berlin
Germany