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AFM images of a transverse section of a biochar-treated root embedded in resin. (a) Topographic image and (b) surface potential image. Internal cell structures including a vacuole (V), cytoplasm (C), and mitochondria (M) are apparent. (c) Schematic diagram of the formation of a complex Fe/Si phase in iron plaque on the root surface and iron-rich nanocomposites and ferritin within the rice root amended with Fe- and Si-enhanced biochar.
