Hi, I am working on amplifying DSSAT with a few new crop options, such as the tropical grass Brachiaria decumbens and a some green-manure legumes (mucuna, cowpea, canavalia). For this, I have to make modifications to the species file (*.spe), the cultivar file (*.cul) and the ecotype file (*.eco). Only the *.cul parameters are explained in the DSSAT manual (vol. 2, p.197). The *.spe and *.eco parameters seem not to be explained anywhere, which does not make it easy to figure out what the parameters mean and how to modify them. Does anyone have a parameter listing -- complete or incomplete -- with explanation of what each of them means or suggestions on how to estimate them? Thanks, Arjan Gijsman Centro Internacional de Agricultura Tropical (CIAT) Apartado Aereo 6713 Cali Colombia [log in to unmask]