When native prairie soils are brought under cultivation, the fraction of soil organic carbon which disappears most quickly is the passive fraction?

The statement is false. When the prairie soils are brought under cultivation, the fraction of soil organic compound carbon which disappears most quickly in not the passive fraction. Prairie soils are dark fertile soils that are formed from the accumulation organic matter produced by dense root systems of prairie grasses. Majority of these soils are found in temperature climates with variable environments. They are the most fertile soils in the world and most of the products that we use, or eat every day come from these types of soils.