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. 2021 Jan 8;11:159. doi: 10.1038/s41598-020-80377-z

Figure 2.

Figure 2

Box plots of relative concentrations of (a) Fe-bearing ions, (b) K, Ca, Mg, Mn, and Ti cations, (c) Si-bearing ions, (d) Al-bearing ions, (e) C-bearing anions, and (f) S-bearing anions, at the exterior and interior surface of the biochar-treated rice root detected by ToF-SIMS. Each plot represents readings from five locations randomly selected in a single specimen.