Researchers studying abandoned charcoal kilns in Italy found that biochar undergoes significant chemical aging over decades. The study shows that the material develops oxygen rich surfaces and interacts with local geology, meaning the benefits of biochar are not uniform and depend heavily on the surrounding soil and rock type. These findings challenge the idea that biochar always increases soil pH or nutrient levels. Instead, the research suggests that long term carbon storage and soil health improvements are site specific, providing a more realistic model for carbon sequestration projects than short term lab tests.
