Primary Diagnostic Horizons

Primary Diagnostic Horizons

Table
Primary diagnostic horizons of soil
  U.S. Soil Taxonomy defining features FAO soil group system
See as table:

Epipedons
  histic thick organic layer histic
. mollic thick, dark, neutral to alkaline mollic
ochric pale or thin ochric
. umbric thick, dark, acidic umbric
Subsurface horizons
  argillic clay mineral deposition argic
. cambic in situ mineral weathering only cambic
oxic highly weathered; aluminum oxide,
iron oxide, and kaolin clay deposition ferralic
. spodic aluminum oxide, iron oxide, 
and humus deposition spodic
See as table:

* * *


Universalium. 2010.

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