In-situ remediation of cadmium-polluted aquic brown soil using different amendments

Aiming to investigate the passivation effect of lime, sepiolite, organic fertilizer, humic acid, and carbon-based silkworm on cadmium-polluted aquic brown soil, we conducted a maize field experiment and analyzed the Cd contents in grains, stalk and leaves of maize, and soil pH, soil available Cd and maize yield under different amendments.The results showed that the soil available Cd contents were significantly reduced under different amendments, decreasing by 26.1%, 22.7%, 21.6%, 18.2% and 17.0% under lime, sepiolite, carbon-based silkworm sand, organic fertilizer and humic acid, respectively.The contents of Cd in maize grains under organic fertilizer, sepiolite, lime, char-based silkworm sand and humic acid decreased by 80.4%, 72.5%, 62.7%, 49.7% and 49.2% compared with the control, respectively.Soil pH increased 0.5 units and 0.4 unites under lime and sepiolite, respectively.Compared with the control, organic fertilizer increased maize yield by 8.51%.Considering field conditions as well as the passivation effect of the amendment and the crop yield, sepiolite or lime or organic fertilizer would be better amendment for Cd polluted aquic brown soil.