Biochar-based restoration of coal mine waste: effects of rice husk and poplar wood-shard biochars on plant growth and physiological performance
This study demonstrates that applying rice-husk biochar at 2–4% significantly enhances the growth and physiological performance of *Artemisia absinthium* and *Silybum marianum* in coal mine waste, with *A. absinthium* proving particularly suitable for heavily degraded substrates due to its linear response to biochar amendments.