Aston,

unfortunately, GENCALC is currently not part of the
DSSAT-Software (version 3.5 has it). I guess the only
choice you have is the "visual eye fit" approach
described on page 35 in following book:

Hunt, L.A. and Boote, K.J. (1998) Data for model operation,
calibration, and evaluation In: Tsuij, G.Y., Hoogenboom, G.,
and Thornton, P.K. (eds.) Understanding options for
agricultural production. Kluwer Publishers.

Good luck !

Cheers,
Matthias

--
Prof. Matthias Langensiepen
Modelling Plant Systems
Institute of Crop Science
Faculty of Agriculture and Horticulture
Humboldt-University of Berlin
Invalidenstrasse 42
10115 Berlin
Germany



Chipanshi, Aston wrote:
>
>
>
>
> Hi,
>
> Could someone assist with how to go about tinkering with genetic
> coefficients when calibrating the CERES models (in particular barley and
> wheat)? We tried to follow the changes suggested in DSSAT v4.2 but we
> are getting extremely low yield values. We have  a very good dataset on
> phenology and grain yield from experimental plots over a period of about
> 3 years. The yield values that we are getting don't make sense at all!!
>
> Thank you,
>
>
>
> ASTON
>
>
>