Abstract
This field study explored safe rice production in Cd-contaminated red paddy soil by application of the combined Si-/Se- containing foliar inhibitors (Si or Se) and the mixture amendments of quicklime (Q), polyacrylamide (A), or/and sepiolite (S) at low (1) and high (2) application rates. The results showed that all treatments increased soil pH and decreased total P and soil organic matter (excluding QSe2). With the increasing application rates, QAS significantly decreased the available Cd because of the enhanced stabilization, while QSi and QSe significantly increased the available Cd because of the inhibited plant uptake. After remediation, QA1, QSi2, and QSe2 most effectively decreased the uptake Cd by rice to meet the threshold of National Food Safety Standard of China. The treatments excluding Q1, QA1, QSi1, and QSi2 did not dramatically change the bacterial community structure in soil. Collectively, QSe2 was recommended for remediating Cd-contaminated red paddy soil.
Highlights
Combined foliar inhibitor and conditioner was used to remediate Cd-polluted paddy soil.
Increase in soil pH and decrease in TP and SOM facilitated stabilization of metals.
Most treatments had little influence on bacterial genus composition in soil studied.
The QSe2 remediation strategy was recommended for Cd-polluted red paddy soil.
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Acknowledgements
This work was funded by the National Key Research and Development Program of China (No. 2018YFC1802803), the Second Tibetan Plateau Scientific Expedition and Research Program (No. 2019QZKK1003), Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDA23010400), Foundation of President of the Zhongke-Ji’an Institute for Eco-Environmental Sciences (No. 2020ZKJA03), and the Natural Science Foundation of Shanxi Province (No. 20210302123204).
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Zhang, G., He, L., Zhang, F. et al. Safe Rice Production in Cd-Contaminated Paddy Soil: Strategy and Environmental Implications. Bull Environ Contam Toxicol 110, 83 (2023). https://doi.org/10.1007/s00128-023-03712-w
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DOI: https://doi.org/10.1007/s00128-023-03712-w