Dear listers, I'm using CERES and SUBSTOR to simulate maize and potato yields in Quebec, Canada. I'm having some difficulties with these models. With CERES, in some sites and years, I have 'slowed grain filling', which result in very late (almost ridiculously so) maturity and harvest dates (harvest is done at maturity). I'm not sure what is causing this, and what I can do to obtain better dates. Can somebody help me with that? My problem with substor is the following: when I do a simulation, I get to the screem titled 'SIMULATED CROP AND SOIL STATUS AT MAIN DEVELOPMENT STAGES' (the 3rd, I think), and, just after the data line for 'Start Sim', I receive the following error message: 'run-time error M6101:MATH - Floating-point error:invalid' I don't know what it means, and I don't know how to fix it. Any help would be greatly appreciated. Thank you for your time and counsel, sincerely, Jean-Philippe Brassard Étudiant gradué Laboratoire de climatologie Département de géographie Université de Montréal tel: (514) 343-8039 email: [log in to unmask] _________________________________________________________________ Send and receive Hotmail on your mobile device: http://mobile.msn.com