Enterobacter cloacae-loaded biochar suppresses cadmium accumulation in rice: Dual stabilization via soil immobilization and iron plaque interception.
Xu W, Li Y, Zhong B, Zhang J, Liu Z
Phytoremediation
Rice paddies on cadmium-contaminated land — and there are millions of acres of them — could become genuinely safer to farm without synthetic chemicals, just by amending the soil with a bacteria-enriched charcoal that costs little to make from rice straw.
Scientists mixed a helpful soil bacterium with biochar (a charcoal made from rice straw) and added it to contaminated soil where rice was growing. The combo persuaded the soil to lock up the toxic metal cadmium so roots couldn't absorb it, and it also triggered the roots to grow a natural iron-rich coating that blocked cadmium even further. Rice grown in the treated soil had far less cadmium in its grain and actually produced a better harvest.
Key Findings
The bacteria-loaded biochar at 3% application reduced plant-available cadmium in soil by 40.84%, converting it into stable, locked-up forms.
The 2% treatment produced the best overall result, shifting microbial communities toward iron-reducing bacteria and significantly increasing protective iron plaque on rice roots.
Cadmium concentrations fell in all rice tissues — root, stem, leaf, and grain — while rice yield improved compared to untreated controls.
chevron_right Technical Summary
A combination of bacteria-loaded biochar dramatically reduced the amount of toxic cadmium that rice plants absorb from contaminated soil, cutting grain cadmium levels while boosting yield. The treatment works two ways: locking cadmium in the soil and triggering iron-rich root coatings that act as a natural barrier.
Abstract Preview
Cadmium (Cd) contamination in paddy soils poses serious risks to environmental quality and human health through rice consumption, necessitating effective amendments to immobilize Cd and reduce its ...
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