Abstract: Effects of four concentrations of silicon (Si0, Si1, Si2, Si3) on cadmium (Cd) accumulation in rice “Taiyou 390” under three Cd concentrations (Cd1, Cd2, Cd3) were investigated. The results showed that rice yield increased with the increases of Si concentration. The Cd concentration in various parts of rice significantly decreased. Si application significantly reduced the transport coefficient in different parts of the rice, prevented the transfer of Cd to the aboveground part, and reduced Cd concentration in rice wound fluid. Si application effectively prevented and controlled Cd absorption in rice, with the magnitude of such effects increasing with Si concentration. With the consideration of cost, corresponding amount of Si should be applied to the pollution degree of Cd in order to reach the limit standard of the pollutants in foods. Meanwhile, there was an interaction between Si and Cd stress on rice agronomic trait, Cd uptake and transport. Our results provide basis for scientific management and rational utilization of heavy metal contaminated soil by proper application of Si fertilizer, which has significance for the production of rice with suitable food safety.

Key words: phosphate-solubilizing fungi, phosphate-solubilizing capability, organic acid, copper mine tailings.