Attendance and presention of my paper on long-term cotton experiments and changes in soil organic carbon in Australian cotton soils at the European Geosciences Union (EGU) Assembly, Vienna, Austria. I presented results on changes in SOC in the long-term experiments being conducted at ACRI in fields C1, D1 and F6. Soil Organic Carbon(SOC) decreased with depth, with the exception of rotations that had standing or incorporated stubble, however there was no one rotation that stood out from the others. Differences between the experiments at ACRI reflected the fact that two had subsoil constraint while the third did not. Also, the starting level in SOC differed between the three experiments and this is reflected in the rate of change in SOC levels in the 0-30 cm depth over time. Including tillage resulted in a decline in SOC, while rotations increased SOC over time.