Fig. 5. Harvestable amounts of Cu (A) and Pb (B) in ryegrass (S = untreated soil, S +GWC= soil plus green waste compost, S + BC = soil plus biochar, S +GWC+ BC = soil plus
green waste compost and biochar combined, and GWCR= green waste compost reference). Different letters indicate significant differences in total harvestable metal amounts
between treatments (p < 0.05).