| 19th World Congress of Soil Science Soil Solutions for a Changing World, Brisbane, Australia 1 – 6 August 2010 |
| Occurrence and environmental significance of sideronatrite and other mineral precipitates in Acid Sulfate Soils | Fitzpatrick Rob | Symposium 2.4.1 |
| On local changes of temperature regime of the soil-atmosphere system around Caspian Sea in 20 Century | Gerayzade Akif | Symposium 1.1.1 |
| On the origin of Planosols - the process of ferrolysis revisited | Van Ranst Eric | Working Group 1.1 |
| Optimal Nitrogen Fertilization Timing for Upland Rice | Fageria Nand | Division Symposium 3.2 |
| Optimal spatial scale determining the response of soil organic carbon to climate change using soil database of China | Shi Xue-zheng | Symposium 1.2.1 |
| Optimisation of nutrient transport processes by plants -boron transport as an example | Fujiwara Toru | Symposium 3.3.2 |
| Optimizing the experimental design of unsaturated soil columns | Lewis Jeff | Symposium 3.2.2 |
| Optimizing water and nitrogen management for irrigated maize in desert oases in Northwestern China | Hu Kelin | Symposium 3.1.2 |
| Optimizing Water Use with High-Transpiration-Efficiency Plants | Prasanna Ayyaru Thevar | Symposium 2.1.1 |
| Organic Amendments in Horticultural Production | Barbazan Monica | Symposium 2.2.2 |
| Organic carbon in topsoil from arable land and grazing land of Europe | Ernstsen Vibeke | Symposium 4.1.2 |
| Organic carbon transformation along a salinity gradient in Louisiana wetland soils | Wang Jim | Division Symposium 2.1 |
| Origin and Chronosequence of Paddy Soils in China | Cao Zhihong | Working Group 3.5 |
| Ornithogenic Cryosols from Ardley Island, Maritime Antarctica | Michel Roberto | Symposium 1.1.1 |
| Orphans in soil classification: Musing on Palaeosols in the World Reference Base system | Vancampenhout Karen Maria Lennert | Working Group 1.1 |
| Overview on Se use in soils of Sao Paulo state and its application to signal-grass | Faria Leticia de Abreu | Congress Symposium 5 |