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Up to now, isotope techniques have not provided convincing evidence of a major mycorrhizal contribution in mineral weathering.  ##Mineral incubations  As mineral weathering is a slow process, in order to quantify weathering rates the minerals should be either incubated for a long time or the mineral Long-term soil incubation of minerals in mesh-bags is a different approach to study mineral weathering. This kind of studies has been reviewed by Gobran *et al.* \cite{Gobran_2005}.