Figure 3: Root and shoot mean ± SD biomass values (n=2) for maize plants grown on the contaminated soils (control), soil treated with compost (C), cashew nut shell bio char (CNSB), rice husk bio char (RHB) at 25 g/500 g and 200 g/500 g and compost modified bio chars (RHBC and CNSBC) at 50 g/500 g (25 g C+25 g Bio chars).