Carbon and nutrient cycling plays a key role in determining the productivity and environmental impacts of soil-plant systems. Improved modelling of carbon and nitrogen processes enables better understanding of how these processes interact to impact on plant/crop production, soil fertility, carbon sequestration and greenhouse gas emissions, based on which management strategies can be developed to increase productivity and sustainability while mitigating climate change. This session invites studies that combine experimental data and simulation modelling to advance our understanding of the carbon and nitrogen dynamics and their interactions. These could include, but not limited to, enhanced carbon capture by plants/crops and soils, formation and decomposition of soil organic matter, soil carbon sequestration, nitrification/denitrification and N2O emissions, role of microbial community, co-limitation of carbon and nitrogen processes, use of stable isotopes (13C, 15N etc) to quantify the rates of carbon and nitrogen processes, and sustainable management of soil fertility etc. Studies with modelling approaches on different levels of complexity, on different spatiotemporal scales, and across natural and agricultural systems are welcome.