Impact of node restriction on Cd and Zn transportation in wheat plant treated with swine manure and its biochar: a field experiment.
Cui Z, Pan Y, Li Z, Liu J, Ozunu A
Phytoremediation
Wheat fields near old industrial zones or heavily fertilized farms can quietly accumulate cadmium in the grain — and biochar made from farm waste is a practical, low-cost tool farmers can apply now to interrupt that contamination before harvest.
Researchers tested whether adding composted pig manure or a charred version of it (biochar) to polluted farm soil could stop the toxic metal cadmium from traveling up into wheat grain. The biochar version worked better, especially at higher application rates — it essentially blocked cadmium at key bottleneck points in the plant's stem so less reached the part we eat. Zinc, a beneficial nutrient that travels similarly to cadmium in wheat, was less affected, meaning the treatment targeted the harmful metal more selectively.
Key Findings
Swine manure biochar (MB) outperformed raw swine manure (OM) at reducing cadmium accumulation in wheat grain on acidic, high-Cd-risk soil.
The higher application rate (3.0 t/ha) of biochar was more effective than the lower rate (1.5 t/ha) at restricting cadmium transport through wheat nodes into the grain.
Node restriction — the plant's natural mechanism for filtering metals at stem junctions — was enhanced by biochar treatment, reducing Cd transport while largely preserving zinc mobility.
chevron_right Technical Summary
Adding swine manure biochar to heavily cadmium-polluted acidic farmland significantly reduced how much of the toxic metal cadmium moved from wheat roots and stems into the grain, making the harvested wheat safer to eat.
Abstract Preview
Cadmium (Cd) contamination in wheat grain remains a food safety concern. In a field experimen on acidic soil with high Cd pollution risk, we evaluated swine manure (OM) and its biochar (MB), each a...
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