Hydrochar decreased the enantioselective bioaccumulation of prothioconazole-desthio in the tobacco through rhizosphere soil metabolic regulation.
Wang X, Yin S, Zheng Y, Yu X, Li Y
Phytoremediation
Compost amendments and biochar you add to your garden beds don't just feed your plants — they actively reshape which soil microbes thrive and how fast pesticide residues break down before roots ever touch them.
Researchers mixed different types of charred material (made from cattle manure and reed straw) into soil contaminated with a common fungicide, then grew tobacco plants in it for 30 days. They found that the char reduced how much of a toxic byproduct of that fungicide got absorbed into the plant roots. Interestingly, charred materials made at lower temperatures (hydrochar) worked differently than those made at higher temperatures (pyrochar) — hydrochar changed the root chemistry and soil microbes in a way that helped beneficial bacteria break the pesticide down before the plant could absorb it.
Key Findings
All four char types reduced prothioconazole-desthio accumulation in tobacco roots, with pyrochar outperforming hydrochar (pyrochar inhibition: 62.7–75.6% vs hydrochar: 34.0–56.4%).
Hydrochar reduced abiotic (non-microbial) breakdown of prothioconazole in soil, but compensated by stimulating root exudate secretion (e.g., phenolic acids) that recruited pesticide-degrading bacteria.
The reduction was enantioselective — the S-enantiomer of prothioconazole-desthio was inhibited at 63.8–73.4% and the R-enantiomer at 67.3–75.6%, showing the two mirror-image forms of the molecule behave differently in soil.
chevron_right Technical Summary
Adding charred organic material (biochar) to pesticide-contaminated soil significantly reduced how much of a harmful fungicide breakdown product accumulated in tobacco plants, with the type of char and its production method both mattering for effectiveness.
Abstract Preview
Pollution of soil environments by pesticides is a serious global issue. Char amendments (pyrochar and hydrochar) have been widely used to remediate contaminated soils. However, the rhizosphere soil...
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