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Résumé — La colonisation par Tuber melanosporum de jeunes racines de noisetiers est fortement influencée par la quantité d'eau apportée quotidiennement. La (fig 7) have shown that, after a 150 d treatment, dryness and high irrigation are responsible for a decrease in P fluorescens levels. P putida populations increase with all treatments and especially with high irrigation. Intermediate taxon levels (i 1 and i 2 ) remain low. Strong iron chelating capacities (CMI>32 ppm) are connected with to P putida and P fluorescens (fig 8). The incidence of irrigation on tree development and mycorrhization is observed. A linear correlation between the surface and the length and width of the leaves of hazelnut trees was previously obtained (fig 1). Dryness has no effect on shoot development (fig 9b) but the sum of the leaf surfaces is correlated with the water supply (fig 9c). Root development and mycorrhization are evaluated as described in

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