[In-situ Remediation Effect of Cadmium-polluted Agriculture Land Using Different Amendments Under Rice-wheat...

Area of Science:

• Environmental Science
• Soil Science
• Agricultural Chemistry

Context:

• Cadmium (Cd) contamination in farmland soils poses a significant risk to crop production and food safety.
• Effective remediation strategies are crucial for mitigating Cd pollution in agricultural ecosystems.

Purpose:

• To evaluate the effects and persistence of five amendments (straw biochar, fly ash, sepiolite, white marble powder, shale) on Cd-contaminated soils.
• To investigate the impact of these amendments on soil properties, Cd availability, and Cd concentrations in rice and wheat grains.

Summary:

• All five amendments increased soil pH and reduced soil available cadmium (Cd) by immobilizing it into less extractable forms.
• Straw biochar and white marble powder showed the highest reduction in Cd availability (20.42%-22.53%).
• Grain Cd concentrations in rice and wheat significantly decreased, with straw biochar, fly ash, and white marble powder treatments resulting in levels near the national safety standard.

Impact:

• One-time amendment application demonstrated a lasting effect on reducing Cd availability and crop Cd concentrations, even after three crop rotations.
• Straw biochar and white marble powder are identified as promising, long-term solutions for safe crop production in Cd-contaminated soils.
• This study provides a theoretical basis for preventing Cd pollution and ensuring food safety in agricultural lands.