Fig. 1. Number of measurements (over all nutrients) with values higher (+) or lower (−) than non-mycorrhizal control plants. (a) Considering all measurements, (b) considering
only those values statistically different from control plants, p < 0.05. Black bars = Allium, White bars = Plantago. *Connotes significantly more positive (or negative) than expected
by chance for p < 0.05.