Ma, et al (2024) Comprehensive effects of tea branch biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More on antibiotic resistance profiles and C/N/S cycling in the compost microbiota of animal manure. Science of The Total Environment. https://doi.org/10.1016/j.scitotenv.2024.177457

Antibiotic resistance genes (ARGs) in animal manure pose significant environmental and health risks, as they can persist and spread through soil, water, and ecosystems. Composting, combined with biochar, offers a potential solution to mitigate these issues. A recent study published in Science of the Total Environment explored the effects of tea branch biochar on ARG profiles and carbon/nitrogen/sulfur (C/N/S) cycling in pig and chicken manure composting.

The study found that adding tea branch biochar extended the thermophilic phase of composting by 1–2 days and increased peak temperatures. This enhanced composting performance by reducing ammonium nitrogen (NH4+-N) levels while preserving organic matter content. Importantly, biochar reduced the abundance of ARGs by up to 30%, targeting a wide range of resistance genes.

Tea branch biochar also influenced microbial communities, promoting the growth of beneficial bacteria such as Firmicutes and identifying Luteimonas as a keystone genus. Luteimonas plays a dual role in shaping ARG profiles and driving essential C/N/S cycling, enhancing nutrient turnover and compost quality.

This research underscores the potential of tea branch biochar as a sustainable amendment for animal manure composting. It not only reduces ARG proliferation but also improves nutrient cycling, offering an effective way to manage manure while minimizing environmental impact. Future studies could optimize biochar application to maximize these benefits for large-scale agricultural practices.