Biogas residues in the battle for terrestrial carbon sequestration: A comparative decomposition study in the grassland soils of the Greater Region

The recycling of biogas residues resulting from the anaerobic digestion organic waste on agricultural land is among means to reduce chemical fertilizer use and combat climate change. This in sacco decomposition study investigates (1) potential granulated residue fraction provide nutrients enhance soil carbon sequestration when utilized as exogenous matter grassland soils, (2) impact different nitrogen fertilizers nutrient release processes. experiment was conducted two permanent grasslands Greater Region over one management period using rooibos tea a comparator material. changes materials after incubation were assessed by measuring mass loss, total status, fibre composition cellulose, hemicellulose lignin. Overall, period, maintained up 68% its mass, carbon; increased content recalcitrant 45% released nitrogen. Granulated demonstrated resilience higher response uniformity exposed fertilizers, opposed material tea. However, magnitude fertilizer-type effect varied, with ammonium nitrate combinatorial treatment raw mixed urea leading highest loss bags. Our findings suggest that biofertilizer supply biota time, promote thereby advance sustainability while contributing change mitigation.