Fig. 1From: Effect of biochar derived from faecal matter on yield and nutrient content of lettuce (Lactuca sativa) in two contrasting soilsShoot yield (fresh weight) of lettuce grown on soil 1 under different biochar and N application rates. Growing cycle 1 = GC1 and Growing cycle 2 = GC2. Values for each growing cycle with different letter within each bar are significantly different (P < 0.05)Back to article page