Abstract: A field experiment was carried out to investigate the effects of different concentrations of silicon-based leaf inhibitors on available Cd in soil, and the content and the transport of Cd in different organs of rice （Oryza sativa L.）. The results showed that leaf inhibitors could not reduce the content of available Cd in soil, but could regulate the transport and accumulation of Cd in rice organs. Compared with the control without leaf inhibitor, the Cd contents in roots, stems, leaves and grain of rice with leaf inhibitor decreased by 13.06%~27.03%, 17.39%~36.96%, 14.89%~42.55%, and 11.11%~32.83%, respectively. The order of Cd accumulation in rice from high to low was root, stem, leaf and grain. The transport coefficients of Cd from root to stem （TF_root-stem）, stem to leaf （TF_stem-leaf） and leaf to rice （TF_leaf-Rice） were 0.36~0.42, 0.47~0.53 and 0.42~0.50, respectively, the transport coefficient from root to stem was the lowest, and it decreased gradually with the increase of the dosage of inhibitor. The yield of rice could be increased by applying a certain amount of leaf inhibitor. Considering the comprehensive factors such as economic cost and the effect of reducing cadmium, the cost was low and the effect was better when the dosage was 4 500 mL/hm².

Key words: silicon-based leaf inhibitor, rice（Oryza sativa L.）, polluted soil, transport coefficient, yield, effect of Cd control