Dear all
  I am Harikrishna working on maize simulation model in relation
to
  different N doses and 4 slplits of N for each N doses. When I
run
  the model the predicted yield level will be satisfactory but
the
  yield respone for the split application of N will be zero. So
when
  I calibrate few values in CO2-X- axis and CO2-Y axis in the
maize
  species (MZCER 980.SPE) file, model predicted accurately yield
  levels of maize for split application of N, at critical stages
of
  crop growth. The calibration of MZCER980.SPE what I followed
is
  valid or not, if not please suggest the correct way of
calibration.

Yours
Harikrishna

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