3.3. Effects of manure compost and sewage sludge on the biomass of vetiver and common reed
The results in terms of the biomass of vetiver and common reed are presented in Fig. 1. The shoot, root, and total dry biomass of vetiver did not increase significantly (p ⩽ 0.05) under the application of manure compost (PZM), with (PZM + F) or without fertilizer in comparison to that grown in pure Pb/Zn tailings (PZ). However, the application of sewage sludge resulted in higher root and shoot biomass (p ⩽ 0.05) than that of vetiver grown in the control tailings (PZ), while the root and shoot biomass declined in the PZS20 treatment. The addition of NPK fertilizer to the sewage sludge (PZS10 + F) produced a higher biomass than that of adding sewage sludge alone (PZS10).