Soil inorganic carbon (SIC) is an important and slow cycling stock of C in soils, but has been understudied relative to soil organic carbon (SOC). Soil studies have tended to avoid calcareous soils as they complicate measurement of SOC, but by avoiding them, soil scientists are overlooking ~30 % of global soils and the complex biogeochemical interactions that arise within them. It is well established that SIC can strongly influence soil chemical, physical, and biological properties, and evidence is beginning to highlight its vulnerability to global change or agricultural practices. We call a new session to discuss insights into calcareous soil (agro-)systems, the SIC cycle, and its interactions with SOC. We welcome studies at pluri-metric scales ranging from global-scale modelling studies, dryland ecosystems and watersheds, down to pedon-scale, micro-, or molecular-scale analyses investigating SIC and its effects on soil biogeochemistry. This includes studies on both primary and secondary carbonate forms, its influence on different elemental cycles, and the role of both abiotic and biotic formation processes. Studies are encouraged that aim to understand the role of SIC in soil processes, systems, and health, the influence of mineral-addition on soil biogeochemistry (such as liming or enhanced rock weathering), or the effects of future change and management practices (such as fertilisation or irrigation) on SIC.