“…However, in the literature, contrasting evidences are reported. For example, in a field experiment, the amount of N mobilized from straw litter and taken up by maize plants increased in the presence of both EWs and AM fungi (Li et al, 2013), while in experiments using grass litter, the effect of EWs on plant N uptake in the presence or absence of AM was not significant (Wurst et al, 2004;Eisenhauer et al, 2009). The extent to which the impact of interaction between EWs and mycorrhizal fungi on N nutrition depends on habitat conditions, such as soil and litter quality (Milcu et al, 2008;Holdsworth et al, 2012) is unknown.…”