Understanding soil selenium accumulation and bioavailability through size resolved and elemental characterization of soil extracts.

In contrast to Se for which there is a negative trend between the concentrations of organic Se fractions and the Se concentrations in plant leaves and roots ( p = 0.19; Fig. 7c ), the concentrations of organic S in larger and aliphatic OM and smaller and/or less hydrophobic, aromatic OM positively correlate with plant S concentrations (Fig. 7b, d ).

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Similarly, the water-soluble sulfate concentrations positively correlate with the S concentrations in plant roots ( p < 0.05), and there is a positive trend between the water-soluble sulfate concentrations and the S concentrations in plant leaves (p = 0.19; Fig. 7b ).

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