What is the Mollic horizon?

mollic horizon A surface horizon of mineral soil that is dark in colour, and relatively deep, and contains (dry weight) at least 1 per cent organic matter or 0.6 per cent organic carbon, the determination of either being acceptable.

What does diagnostic horizon mean?

Diagnostic Horizon a soil horizon having a set of quantitatively defined properties which are used in soil classification. Criteria used are observed (colour, hardness, temperature) or values (depth, contents, volumes, densities) measured by methods independent of the observer.

What is argillic horizon?

A subsoil horizon characterized by an accumulation of illuvial clay, defined by the percent of clay content relative to the overlying clay depleted (eluvial horizon) and usually has coatings of clay on the surface of soil pores and structures where it has been deposited from percolating soil water.

What is Spodic horizon?

A subsurface soil horizon in which organic matter together with aluminium and often iron compounds have accumulated amorphously. It is a diagnostic horizon. The name is from the Greek spodos meaning ‘wood’.

What is OXIC horizon?

oxic horizon A mineral subsoil horizon that is at least 30 cm thick and is identified by the almost complete absence of weatherable primary minerals, by the presence of kaolinite clay, insoluble minerals such as quartz, hydrated oxides of iron and aluminium, and small amounts of exchangeable bases, and by low cation- …

What is Histic epipedon?

A surface soil horizon, not less than 1 m in depth, high in organic carbon, and saturated with water for some part of the year. See also humus (2). The name is from the Greek histos, meaning ‘web’.

What is a Gypsic horizon?

The gypsic horizon (from L. gypsum) is a non-cemented horizon containing secondary accumulations of gypsum (CaSO4. 2H2O) in various forms. Diagnostic criteria.

Which horizon horizon is least weathered?

C: The C horizon
C: The C horizon is a subsurface horizon. It is the least weathered horizon. Also known as the saprolite, it is unconsolidated, loose parent material. The master horizons may be followed by a subscript to make further distinctions between differences within one master horizon.

What is Histic soil?

A surface soil horizon, not less than 1 m in depth, high in organic carbon, and saturated with water for some part of the year. See also humus (2). The name is from the Greek histos, meaning ‘web’. From: histic epipedon in A Dictionary of Ecology »

How do you identify epipedon?

Epipedons are characterized by their colour, texture, structure, and content of organic matter and certain plant nutrients (e.g., calcium, phosphate). Another important concept is that of subsurface diagnostic horizons.

What is Histic Epipedon?

What is in the C horizon?

C horizon. noun. the layer of a soil profile immediately below the B horizon and above the bedrock, composed of weathered rock little affected by soil-forming processes.

What is O horizon also known as?

The horizons are: O (humus or organic): Mostly organic matter such as decomposing leaves. The O horizon is thin in some soils, thick in others, and not present at all in others. A (topsoil): Mostly minerals from parent material with organic matter incorporated.

What is epipedon and Endopedon?

Epipedon is the horizon that forms near the soil surface. Endopedon is diagnostic horizon characterized by the accumulation of aluminum and organic matter with or without iron.