Under field trial conditions, the remediation effects of different passivation materials on farmland soil which slightly polluted by Cd, and the aftereffects of rice restoration in the second year after the rice wheat rotation were studied. The results showed that all the passivation materials had different removal effects on available Cd in the farmland soil which slightly polluted by Cd and the content of Cd in rice grain. Of all the materials, mid level nano materials and mid level nano materials with lime had the best remediation effects, the reduction rates of available Cd in the soil were 50.94% and 47.15%, respectively, and the reduction rates of Cd in rice grain were 73.74% and 69.41%, respectively. |