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Schematic illustration of the experimental design. Mycorrhizal and non-mycorrhizal plants were grown under S deficient conditions until day 60; all plants were watered with a nutrient solution deprived of Fe and S and containing a low P concentration (10 μM). On day 60 S was provided to the plants as sulfate. Fe was provided to the plants in the form of sparingly soluble FePO4, throughout the experiment. Samplings took place on days 30, 45, 60 (before S supply), 61 and 62.
