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Safe usage of Cd-polluted paddy fields using alkaline Si-rich compound amendment: Effect and mechanism
Liang Wang1, Baolin Yang1, Qiqing Liu2
1Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences (CAS), Beijing, 100101, China; Beijing Key Laboratory of Environmental Damage Assessment and Remediation, Beijing, 100101, China.
Low-cost alkaline Si-rich compound materials effectively reduced cadmium (Cd) in rice by 75% while boosting yields and improving soil quality. This technology offers a practical solution for remediating Cd-polluted paddy fields.
Area of Science:
- Environmental Science
- Agricultural Science
- Soil Science
Background:
- Cadmium (Cd) pollution in rice poses a significant global health risk.
- Effective, low-cost remediation technologies are crucial for contaminated agricultural lands.
Purpose of the Study:
- To evaluate the efficacy of four alkaline compound materials in mitigating Cd contamination in rice.
- To elucidate the mechanisms underlying Cd reduction, yield enhancement, and soil quality improvement.
Main Methods:
- Field experiments were conducted in southern China using four alkaline compound materials.
- Measurements included grain Cd content, rice yield, soil pH, and nutrient availability.
- Structural equation modeling and regression analysis were used to determine mechanisms.
Main Results:
- Two Si-rich alkaline materials (AF-SC, AF-SS) significantly reduced grain Cd by ~75% and increased rice yield (6.7%-21.0%).
- Soil pH increased, and available phosphorus and silicon contents were enhanced, reducing soil Cd.
- Alkaline conditions and increased silicon inhibited Cd uptake and translocation.
Conclusions:
- Alkaline Si-rich compound materials provide a cost-effective, multi-benefit solution for Cd-polluted paddy fields.
- These materials simultaneously address Cd contamination, crop yield, and soil health.
- The findings support the application of these materials for sustainable agriculture in affected regions.
