ACKNOWLEDGEMENTS 
The MARS project, coordinated by the Joint Research Centre (JCR) of Ispra, is acknowledged for supplying 
SPOT data. We gratefully thank SOTEMA (SOciété de TElédétection en Matière Agricole) for prov iding 
many information concerning the study site, and processing SPOT data. The authors also thank J. R. Porter for 
providing the code of the AFRCWHEAT2 model, J. Goudriaan and B.A.M. Bourn an for EXTRAD model and 
A Kuusk for Nilson-Kuusk model. 
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