Fig. 2 | Nature Communications

Fig. 2

From: Organic coating on biochar explains its nutrient retention and stimulation of soil fertility

Fig. 2

Identification of biochar surface modifications induced by co-composting. a Elemental composition of the surface (particle) and the bulk (powder) biochar according to X-ray photoelectron spectroscopy (XPS). b Carbon-containing functional groups according to region scans (higher energy resolution) of the same samples. cf Scanning electron micrographs of co-composted biochar with c a region with degraded, but still exposed original biochar surfaces showing typical porous structure (scale bar, 20 µm); d a region of biochar surface partially covered with organic coating (scale bar, 10 µm); e a region of biochar surface completely covered with organic coating (scale bar, 600 µm). f map overlay of e showing the heterogeneous distribution of Al (green), Si (blue) and Fe (red) within the organic coating as quantified by energy-dispersive X-ray spectroscopy

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