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Intercropping a Cd-accumulator with economically valuable crops is common in slightly or moderately Cd-polluted farmland soils. A field experiment was conducted to evaluate the effects of water-soluble chitosan (WSC) on the growth and Cd uptake of the Cd-accumulator  Hylotelephium spectabile  and soybean ( Glycine max ) during a co-cultivation in Cd-contaminated agricultural soil (WSC, 0 and 10 g·m −2 ). The results indicated that soybean yields were highest in response to the intercropping and WSC treatment. The results from the field trials generally showed that intercropping and WSC treatments significantly decreased Cd concentrations in inedible parts of soybean by 42.9–72.1% (except for stems), in the meantime, increased 95.8%–334.6% in shoot and root tissues of  H. spectabile  compared with the control ( p  &lt; 0.05). The data revealed that Cd uptake was highest for  H. spectabile  during the intercropping and WSC treatment. The application of WSC in the intercropping system significantly increased the uptake of Cd by  H. spectabile , but not by soybean. The findings of this study suggest that combining an intercropping system with a WSC treatment may be better for remediating Cd-contaminated soils than other methods involving the growth of a single hyperaccumulator.

international journal of phytoremediation

Effects of water-soluble chitosan on  Hylotelephium spectabile  and soybean growth, as well as Cd uptake and phytoextraction efficiency in a co-planting cultivation system