Fig. 1From: Effects of brewer’s spent grain biochar on the growth and quality of leaf lettuce (Lactuca sativa L. var. crispa.)Photographs of the brewer’s spent grain and each of the biochars produced (a–d) and scanning electron microscope (SEM) images of e brewer’s spent grain (BSG), f biochar produced at 300 ℃ (BB300), g biochar produced at 500 ℃ (BB500) and h biochar produced at 700 ℃ (BB700)Back to article page