Prior to transplanting, half of the pots received a commercial mycorrhizal inoculum carrying Rhizophagus irregularis (formerly Glomus intraradices) and Funneliformis mosseae (formerly Glomus mosseae) (Aegis Microgranule, Italpollina S.p.A., Rivoli Veronese, Italy) by mixing 15 L of inoculum containing bulking material composed of 95% minerals as
granular carriers, plus root fragments and spores (25 spores mL−1 of
R. irregularis and 25 spores mL−1 of F. mosseae) per m3 of substrate.