Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Chaos art. 023130 MAROC 2014 fdi:010062322 ENG Chaos 1054-1500 ISI:000338668900032 2 10.1063/1.4882376 https://www.documentation.ird.fr/hor/fdi:010062322 https://www.documentation.ird.fr/intranet/publi/2014/08/010062322.pdf 24 Horizon (IRD) The dynamics underlying cereal crops in the northern region of Morocco is investigated using a global modelling technique applied to a vegetation index time series derived from satellite measurements, namely, the normalized difference vegetation index from 1982 to 2008. Two three-dimensional chaotic global models of reduced size (14-term and 15-term models) are obtained. The model validation is performed by comparing their horizons of predictability with those provided in previous studies. The attractors produced by the two global models have a complex foliated structure-evidenced in a Poincare section-rending a topological characterization difficult to perform. Thus, the Kaplan-Yorke dimension is estimated from the synthetic data produced by our global models. Our results suggest that cereal crops in the northern Morocco are governed by a weakly dissipative three-dimensional chaotic dynamics. 126 ; 020 UR113