Hello Jans,

the only choice you have is to fiddle around with
the genetic coefficients and see what happens
with seasonal model outputs. Keep in mind,
that PHINT also influences the simulation of
biomass accumulation.

A pre-condition will be a sound experimental
basis, preferably gathered during an extended
period. Choose those treatments which are certainly
known not to be affected by any kind of stresses
(which means not only checking management
conditions, but also Bavarian weather conditions).
Use GENCALC then, to determine the genetic
coefficients for your specific variety under
these optimum conditions.

A sound determination of genetic coefficients
is a prerequisite to proceed with further
analysises, including stress events.
The water routines of CERES strongly influence
the simulation of actual biomass growth
and I would recommend to keep an eye
on that.

Since potential biomass is estimated
on the basis of the concept of radiation
use efficiency, it is strongly recommendable
to also check outputs from your radiation
sensor.

Wish you good luck in solving your problem.

Matthias



--
Matthias Langensiepen, PhD
Hannover, Germany

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