The program is called isusse.for. This program reads the first run in growth.out, nitrogen.out, and water.out, and matches measured data in file T with predicted data in the *.out files. To use this, 1) be sure you have your simulation output set to 1 day intervals. 2) Run crop model for your desired experiment and treatment 3) terminate crop model and run isusse.exe. An output file will be created which has 2 parts. The first part of the statistics filename is the same as the first part of the fileT. The second part corresponds to the treatment number. For instance, I ran IUAF9501.SBX and isusse.exe once for each of 5 treatments. I get the following files: IUAF9501.G01 - Statistical data for treatment 1 IUAF9501.G02 - Statistical data for treatement 2 IUAF9501.G03 - Statistical data for treatment 3 IUAF9501.G04 - Statistical data for treatment 4 IUAF9501.G05 - Statistical data for treatment 5 There is also a slight modification that needs to be made to the file T. An exclamation point should be entered followed by either GROWTH, NITROGEN, OR WATER. See the file iuam9501.sbt file that I have attached for an example. Feel free to change or modify this program and use it in any way you'd like. Call if you have any problems. Bill --------------------------------------------------------- Dr. William D. Batchelor Assistant Professor Agricultural and Biosystems Engineering Department Iowa State University Ames, IA 50011-3050 ph. 515-294-9906 fax 515-294-2552 email [log in to unmask] ----------------------------------------------------------