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Soil culture experiments were carried out to study the effects of the mixture of cadmium (Cd) hyperaccumulator straw ( Solanum nigrum  L.,  Amaranthus chinense  L., and  Siegesbeckia orientalis  L.) and phosphate rock on soil pH, available Cd content and soil nutrients in Cd polluted soil. The results showed that: (1) The soil pH was increased to a certain extent by three kinds of compound materials. (2) The contents of available potassium (AK) and available phosphorus (AP) in soil were increased to a certain extent by the three compounding materials, but there was no significant effect on total nitrogen (TN). And 2% phosphate rock powder and 1%  Amaranthus chinense  L. had the greatest increase in AP, reaching 49.28%, and 2% phosphate rock powder and 1%  Siegesbeckia orientalis  L. had the greatest increase in AK, reaching 136.23%. (3) The available Cd content in soil was reduced by three kinds of compound materials. The decrease of available Cd was the greatest in 2% phosphate rock powder and 1%  Solanum nigrum  L. straw mixed, which was 12.71%. In summary, the combination of Cd hyperaccumulator straw and phosphate rock powder can effectively passivate Cd in soil and improve soil nutrient content, and 2% phosphate rock powder and 1%  Solanum nigrum  L. straw are the best.

The Passivation Effect on Cd of Mixing of Hyperaccumulated Plant Straw and Phosphate Rock Powder in Cd Polluted Soil