Dr. Favreau: There is a sugar beet model that was developed about 10-15 years ago by Dr. Robert S. Loomis, University of California, Davis. It had pretty good physiological detail as I recall, however, it would need to be modified to operate with the DSSAT input files, and to output simulated outcomes to the DSSAT files for graphics, etc. If you are up for a bit of work, you may wish to contact Dr. Loomis. He is officially retired, but he is still quite active and comes in to work very regularly at the Agronomy Dept., Univ of California, Davis. Good luck, Ken Boote