Figure 3.

Chemical amendments assisting the heavy metal uptake in the plants, adapted from Souza et al. [43]. Figure (A) depicts that a hyperaccumulator plant accumulates the heavy metal gradually and constantly during the entire life cycle of the plant, whereas Figure (B) shows that the heavy metal behavior of a non-hyperaccumulator plant is relatively slow, but the metal uptake increases quickly after the application of chemical amendments along with metals.