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N derived from the atmosphere (Ndfa) as a percentage of total N content (A) and as the amount of N fixed (B) in the aboveground biomass of faba bean. Cs, cropping system (pure stand, mixture); M, absence (–myc) or presence (+myc) of arbuscular mycorrhizal fungi (AMF). *, **, and *** indicate significant differences at P ≤ 0.05, 0.01, and 0.001, respectively; ns indicates nonsignificant differences. Vertical bars indicate standard errors of each mean value (n = 5).
