Dear my friends DSSAT servers
  Hi
  Please if possible, see the article entitle" validating CERES-wheat under North-German environmental condition" by M. Langensiepen and co-authors in Agricultural Systems Journal (article in press). This article challenges the using and performance of CERES-wheat model to simulate grain yield and biomass production under different water and nitrogen conditions.
  In my idea genetic coefficients are cultivar-dependent and should not be changed over years, but in their calibration procedure, they assume genetic coefficients are environment-dependent which according to environmental condition of each year have changed! If so, what is the mean of the yield variability? In my idea, yield variability is the yield of a crop over different years or in the other word, running the model with fixed genetic coefficients over different years.
  Apparently, it seems that they did not calibrate water and nitrogen modules in their work!
  This case may be a good discussion topic for DSSAT servers and sharing information about strength and weakness points of the DSSAT models with each others.

  Best
  Bahram Andarzian
  Ph.D in Crop Eco-physiology
  Agricultural and Natural Resources Research Center of Khuzestan
  Ahvaz-Iran


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