Humus forms with an Oh horizon

  • Humus forms with an Oh horizon
This class encompasses the types Moder and Mor. These types differ from Mull humus forms in the presence of an Oh horizon underlying the Ol and the Of horizons. Depending on the intensity of organic matter decomposition, Oh horizons may show various forms of packing, from friable to compact.

very thin and powdery Oih horizon occuring in patches, Mull-like Moder , © Gerhard Milbert

Humus form type Moder

Humus form type Mor