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Safe Rice Production in Cd-Contaminated Paddy Soil: Strategy and Environmental Implications.

Guixiang Zhang¹, Lixia He¹, Fengsong Zhang^2,3

¹School of Environment and Resources, Taiyuan University of Science and Technology, Taiyuan, 030024, Shanxi Province, China.

Bulletin of Environmental Contamination and Toxicology

|April 24, 2023

Summary

This summary is machine-generated.

This study investigated safe rice production in cadmium-contaminated soil using foliar inhibitors and soil amendments. The QSe2 treatment effectively reduced cadmium uptake in rice, meeting food safety standards.

Keywords:

Amendments Cadmium Foliar inhibitors Red paddy soil Safe rice production

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Area of Science:

Environmental Science
Soil Science
Agricultural Science

Background:

Cadmium contamination in paddy soils poses risks to rice safety and human health.
Red soils are particularly vulnerable to heavy metal contamination.
Developing effective remediation strategies for safe rice cultivation is crucial.

Purpose of the Study:

To explore safe rice production in cadmium (Cd)-contaminated red paddy soil.
To evaluate the efficacy of combined silicon (Si)/selenium (Se) foliar inhibitors with soil amendments (quicklime (Q), polyacrylamide (A), sepiolite (S)) at varying rates.
To assess the impact of treatments on soil properties, Cd availability, plant uptake, and soil bacterial communities.

Main Methods:

Field study applying combined Si-/Se- foliar inhibitors and mixture amendments (Q, A, S) at low (1) and high (2) rates.
Monitoring soil pH, total phosphorus (P), soil organic matter, and available Cd.
Quantifying Cd uptake in rice grains.
Analyzing soil bacterial community structure.

Main Results:

All treatments increased soil pH and decreased total P and soil organic matter (except QSe2).
QAS significantly decreased available Cd due to stabilization; QSi and QSe increased available Cd by inhibiting plant uptake.
QA1, QSi2, and QSe2 treatments most effectively reduced Cd uptake by rice to meet food safety standards.
Most treatments did not significantly alter soil bacterial community structure.

Conclusions:

The combined application of quicklime, sepiolite, and selenium (QSe2) is recommended for remediating Cd-contaminated red paddy soil.
Specific treatment combinations (QA1, QSi2, QSe2) achieved safe rice production by reducing Cd uptake.
The study provides valuable insights into managing Cd contamination in agricultural soils for food safety.