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Related to EXCH: foreign exchange, exchanges
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Mean proportions of Mn decreased in the order: RES [approximately equals] FeAM [is greater than] MnOX [is greater than] FeCR [is greater than] ORG [approximately equals] EXCH.
For both Co and Mn, the smallest proportions of these elements were found in the EXCH fraction (Figs 3 and 4), ranging from 0.
Unlike Co, the Mn concentration in the EXCH fraction was not significantly related to pH but was significantly correlated with Mn-FeAM and negatively correlated with the amount of clay in the soil (Table 6).