Thermolabile and thermostable OM of Chernozems: Substances identified in OM of Chernozems [Typical Chernozems of Kursk area, Russia Haplic Chernozem (Loamic, Pachic)] of long-term experiments using double-shot pyrolysis GC MS.

Contain compounds obtained during thermodesorption (TD) at 300C and pyrolysis (PY) at 500C form Chernozems different type of use: 1. Annually Mown Steppe (Steppe), 2. Permanent tilled bare fallow since 1964 (Permanent fallow), 3. Unmanaged fallow since 1998 after permanent bare fallow (Unmanaged), 4. Permanent potatoes since 1964 (Potato), 5. Permanent corn (Corn), 6. Grain-raw crop rotation (Rotation).