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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).
However, as for the EXCH and ORG fractions, a significant correlation was observed between %Co-MnOX and %Mn-MnOX (r = 0.
Conversely, Co and Mn in the EXCH, ORG, and MnOX fractions are much more likely to have a considerable influence on Co and Mn availability.