Effects of biochar and crop straws on the bioavailability of cadmium in contaminated soil

Overview

This pot study compared biochar and crop straws (peanut vine and rice straw) as soil amendments for immobilizing cadmium in contaminated soil, using peanut as the test plant. It is upstream agronomic-mitigation mechanism evidence on cadmium bioavailability and soil-to-plant transfer; it reports no retail food occurrence and is context-only for Heavy Metal Index purposes.

Key numbers

• Amendments applied at 5% (dry weight, w/w) in controlled mesocosms.
• Relative to peanut vine and rice straw, biochar amendment gave lower cadmium in aboveground tissue (13.56% and 8.28% lower), in seeds (40.65% and 35.67% lower), in roots (9.08% and 7.09% lower), and lower exchangeable Cd in soil (35.80% and 28.48% lower).
• Biochar amendment also increased peanut biomass and physiological quality, and was the more effective Cd immobilizer (P < 0.05).

Methods (brief)

Peanuts grown in plastic pots with biochar or crop straw at 5% w/w in Cd-contaminated soil; cadmium bioavailability assessed by plant tissue Cd and by chemical fractionation of soil Cd.

Implications

Certification: Contributes nothing to HMT&C threshold pools. It is agronomic-mitigation mechanism evidence (soil amendment to lower Cd bioavailability); route as exposure/mechanism context to Soil-to-plant transfer of heavy metals, Cadmium, and Agronomic mitigation.

Courses: Useful comparison of biochar vs crop-straw amendments as a cadmium-immobilization lever, supporting the soil-amendment sub-class of agronomic mitigation.

App: No contamination_profile blocks are touched.

Microbiome: Not a focus of this source.

Wiki pages this source may touch

• Cadmium
• Soil-to-plant transfer of heavy metals
• Agronomic mitigation

Verification notes

• Evidence tier B: primary pot experiment in a peer-reviewed journal (Scientific Reports, CC BY 4.0).
• Page grounded in the published abstract and bibliographic metadata; numeric values preserved as printed. Full-text numeric extraction can follow on synthesis.
• ingredients: [] / products: [] correct: experimental soil-amendment context, not retail food occurrence; peanut is the test species, carried in matrices.
• Part 2 direction-of-edit check: adds upstream mitigation mechanism literature; neutral to HMT&C thresholds, moves toward the literature.

Update history

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