Fig. 3

Impact of the purified commercial FAs and HAs on the availability of Mn in the six studied soils. Values with different superscript letters differ significantly (p < 0.05, Tukey’s multiple range test).
Impact of the purified commercial FAs and HAs on the availability of Mn in the six studied soils. Values with different superscript letters differ significantly (p < 0.05, Tukey’s multiple range test).