Fig. 2
From: Terra Preta production from Ghanaian and Zambian soils using domestic wastes
Total C (A) and plant-available P (B) contents of the biochar (p = 0.008) and charcoal (p = 0.005) Terra Preta (N = 3 ± Standard error of means). Bars of the same colour followed by different letters depict significant differences at 5% significance level.
