Ferralic properties General description. It also includes soil materials which would qualify for a ferralic horizon apart for their coarse texture. Geric properties General description. Gleyic properties General description. If the material is rich in sulphur blackish colours prevail due to iron sulphides.
Sands are usually light grey to white in colour and often also impoverished in iron and manganese.
The upper part of a reductomorphic horizon may show up to 5 percent rusty colours mainly around channels of burrowing animals or plant roots. Also, the dipyridyl test often gives a good indication if ferric iron is present in the soil solution. Permafrost is a layer in which the temperature is perennially at or below 0 C for at least two consecutive years.