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Phytoavailability-based threshold values for cadmium in soil for safer crop production
Hyuck Soo Kim1, Byoung-Hwan Seo2, Gary Owens3
1Department of Biological Environment, Kangwon National University, Chuncheon-si, Gangwon-do, 24341, Republic of Korea.
Ecotoxicology and Environmental Safety
|June 20, 2020
Summary
Establishing soil cadmium phytoavailability thresholds is crucial for food safety. This study recommends shifting from total metal concentrations to phytoavailable levels for safer agricultural production.
Area of Science:
- Environmental Science
- Agricultural Science
- Soil Chemistry
Background:
- Phytoavailability of heavy metals in soils is critical for food safety and environmental health.
- Establishing scientifically-backed soil metal phytoavailability threshold values is essential.
Purpose of the Study:
- Determine optimal cadmium (Cd) phytoavailability threshold values for bean, rice, and sesame.
- Develop transfer functions to set crop-specific soil Cd phytoavailability standards.
- Validate rice Cd phytoavailability thresholds with independent data.
Main Methods:
- Analyzed 100 diverse soils for Cd phytoavailability using three common extraction methods (1 M NH4NO3, 0.05 M EDTA, Mehlich3).
- Correlated extracted soil Cd with plant Cd concentrations.
- Derived transfer functions to establish crop-specific threshold limits.
Main Results:
- Soil Cd extracted by NH4NO3, EDTA, and Mehlich3 showed stronger correlations with plant Cd than total soil Cd.
- Optimal Cd phytoavailability threshold values were determined for bean, rice, and sesame.
- Crop-specific soil Cd phytoavailability threshold values were established.
Conclusions:
- Soil metal phytoavailability thresholds are more effective indicators than total concentrations for ensuring food safety.
- Current agricultural soil heavy metal management policies should be updated to include phytoavailability assessments.
- Implementing phytoavailability-based management promotes safer agricultural food production.
