968682.fig.001a
(a)
968682.fig.001b
(b)
968682.fig.001c
(c)
968682.fig.001d
(d)
Figure 1: Environmental scanning electron microscope (FEI Quanta FEG 600) images of (a)-(b) barley straw biochar and, (c)-(d) pine wood shaving biochar. Images are 3000x magnification and were obtained at 12.5 kV and low vacuum (0.50 and 0.60 Torr for straw and pine wood biochars, resp.).