Fig. 4From: Fertilizing behavior of extract of organomineral-activated biochar: low-dose foliar application for promoting lettuce growthScanning transmission electron microscopy (STEM), energy dispersive X-ray spectroscopy (EDS) analysis of a PCS-BC (pine wood, clay, and sand biochar) particle from foliar application of PCS25 (PCS biochar extract at 1:25 dilution) treated plant leaf powder. a Secondary electron micrograph of an identified biochar particle showing nanoscale agglomerate in the C-matrix. b EDS spectrum of total identified area; and c elemental map of biochar particle indicating the presence of mineral elements on the surface of identified particleBack to article page