New research reveals that biochar triggers lasting recovery in acidifying paddy soils by increasing soil pH, reducing harmful metals, and enriching beneficial microbes. Over five years of field study, scientists observed that these changes promote healthier microbial communities and increased metabolic activity, providing a sustainable alternative to short-term chemical treatments such as lime or manure. These findings highlight biochar as an effective strategy for restoring degraded farmland and improving soil health.
Long-term study shows biochar outperforms lime and manure in acidified soils
Soil acidification reduces yields, depletes nutrients, and increases toxic metal levels worldwide. Farmers apply lime or manure, but these are short-lived or cause trade-offs.
Researchers ran a long-term field experiment in acidic paddy soils, comparing biochar to lime and swine manure. Using multi-omics, they analysed soil chemistry, microbes, viruses, and metabolites over five years.
Long-term soil recovery and enhanced agricultural resilience
The study revealed that while all treatments improved soil acidity, only biochar triggered a coordinated transformation across the entire soil system. It also increased soil pH, reduced levels of harmful metals, and induced biological changes.
“We found that biochar does not just fix soil chemistry. It reshapes the entire soil ecosystem, from microbes to metabolites,” said one of the study’s authors. “This coordinated response is what makes its effects more persistent and effective.”
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