Figure 1. Yield of ryegrass obtained in the different Cd treatment of Abara ´n soil and Cartagena soil after 3 h, 20 days, and 60 days of incubation. LSD: Least significative difference (P < 0.05) of ryegrass yields between levels of Cd concentration for each incubation time. Yields with an asterisk were significantly different from the control.