Fig. 4From: Mechanism of composite passivators to reduce cadmium absorption and accumulation in Chinese cabbage on cadmium-polluted soilEffects of composite passivator on MDA (a), superoxide anion (b), H2O2 (c), and hydroxyl radical scavenging ability (d) in Chinese cabbage. Note: Different lowercase letters indicate significant differences between treatments (p < 0.05)Back to article page