A horizon
Noun 1. the top layer of a soil profile; usually contains humus (synonym) A-horizon (hypernym) soil horizon (substance-meronym) humus A-horizon Noun 1. the top layer of a soil profile; usually contains humus (synonym) A horizon (hypernym) soil horizon (substance-meronym) humus | ||||
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A Horizon definition was found in categories: Society & Culture(1) Science & Technology(1) Encyclopedia(1)
A Horizon Definition from Society & Culture Dictionaries & Glossaries
| Environmental Engineering (English ver.) |
A-HORIZON
The uppermost zone in the Soil Profile, from which soluble Salts and Colloids are leached, and in which organic matter has accumulated. Generally this represents the most fertile soil layer. Along with the B-Horizon, this layer constitutes part of the Zone of Eluviation.
The uppermost zone in the Soil Profile, from which soluble Salts and Colloids are leached, and in which organic matter has accumulated. Generally this represents the most fertile soil layer. Along with the B-Horizon, this layer constitutes part of the Zone of Eluviation.
A Horizon Definition from Science & Technology Dictionaries & Glossaries
| Agricultural Glossary/yigini2004 |
A Horizon
Mineral horizon formed at or near the surface in the zone of leaching and eluviation of materials in solution or suspension or of maximum in situ accumulation of organic matter. Distinguishing characteristics usually designated by a subscript e.g. Ah - humic( organic matter rich) horizon
Mineral horizon formed at or near the surface in the zone of leaching and eluviation of materials in solution or suspension or of maximum in situ accumulation of organic matter. Distinguishing characteristics usually designated by a subscript e.g. Ah - humic( organic matter rich) horizon
A horizon
—The original top layer of mineral soil divided into A1 (typically from 5 to 30 cm thick; generally referred to as topsoil with a high content of organic matter, dark colour and maximum biological activity) and A2 horizons (usually 5 – 70 cm thick; similar texture to A1 but paler in colour, poorer in structure and less fertile).
A Horizon Definition from Encyclopedia Dictionaries & Glossaries
| Wikipedia English - The Free Encyclopedia |
Soil horizon
A soil horizon is a specific layer in the soil which parallels the land surface and possesses physical characteristics which differ from the layers above and beneath. Horizon formation is a function of a range of geological, chemical, and biological processes and occurs over long time periods. Identification and description of the horizons present at a given site is the first step in classifying a soil at higher levels, through the use of systems such as the USDA soil taxonomy or the Australian Soil Classification.
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