Decreasing cadmium uptake of rice (Oryza sativa L.) in the cadmium-contaminated paddy field through different cultivars coupling with appropriate soil amendments
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In southern China, Cd-tainted rice produced in Cd-contaminated acidic paddy soils is a serious health concern. Thus, it is essential and urgent to remediate Cd-contaminated soils and reduce Cd accumulation in rice grains for food safety and human health.
Materials and methods
Four soil amendments (e.g., lime, biochar, soil conditioner, and seaweed organic fertilizer) combined with two rice cultivars (Yongyou17, YY-17; and Xiushui09, XS-09) with different Cd accumulation abilities were selected to evaluate the efficacy of safe utilization in a slightly moderately Cd-contaminated paddy soil.
Results and discussion
Results showed that soil amendments significantly increased soil pH and reduced Cd bioavailability compared with the control. Linear regression analysis showed that the decrease in Cd bioavailability was significantly and positively correlated with soil pH increase (P < 0.001). Soil amendments were efficient in reducing Cd uptake by rice root as well as translocation from root to aboveground plant parts. The Cd concentrations in brown rice of YY-17 and XS-09 were 0.34 and 0.22 mg kg−1 for control treatments, respectively, while the Cd concentrations of rice grain using were reduced by 45 to 88% and 55 to 88% soil amendments for two cultivars. Considering the costs and efficiency of soil amendments, the soil conditioner was the best amendment.
In situ immobilization combined with low-Cd-accumulation rice cultivar is an effective approach for food safety in lightly moderately Cd-contaminated acidic paddy soils.
KeywordsCadmium (Cd) In situ immobilization Rice (Oryza sativa L.) Safe utilization Soil amendments
This work was jointly supported by the National Key Research and Development Program of China (2016YFD0200106) and the National Natural Science Foundation of China (41571450 and 41721001).
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