Placic Humic Podzol (P.HP)
Common horizon sequence: LFH or O, Ae, Bh, Bhfc or Bfc, BCgj, Cgj
These soils have the general properties specified for the Podzolic order and the Humic Podzol great group. They differ from Orthic Humic Podzols by having a placic horizon within the control section. A placic horizon (Bhfc, Bfc, Bfgc) consists of a single thin layer that is commonly 5 mm or less in thickness, or a series of thin layers that are irregular or involute, hard, impervious, often vitreous, and dark reddish brown to black in color. These thin horizons are apparently cemented by Fe-organic complexes, hydrated Fe oxides, or a mixture of Fe and Mn oxides. The placic horizon or thin iron pan may occur in any part of the B horizon except the Bh, and commonly it extends into the BC horizon.
Placic Humic Podzols usually have L, F, and H or O horizons and an Ae horizon. They do not have an ortstein horizon but may have a duric horizon or a fragipan. Evidence of gleying in the form of dull colors or mottling Is commonly apparent especially above depressions in the placic horizon. These soils occur most commonly in wet sites in maritime regions; frequently the surface is peaty.
Note: Diagnostic horizons are underlined.