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  2. Enrichment factor - Wikipedia

    en.wikipedia.org/wiki/Enrichment_factor

    The enrichment factor can also be used to talk about the level of radioactive isotopes in uranium, or the level of minerals in soil. [1]The same concept is used in Bioinformatics for gene analysis, to measure the added value of a search tool over another one or over the homogeneous distribution in the genome population.

  3. Soil formation - Wikipedia

    en.wikipedia.org/wiki/Soil_formation

    Soil formation is influenced by at least five classic factors that are intertwined in the evolution of a soil. They are: parent material, climate, topography (relief), organisms, and time. [ 9 ] When reordered to climate, organisms, relief, parent material, and time, they form the acronym CLORPT.

  4. Supergene (geology) - Wikipedia

    en.wikipedia.org/wiki/Supergene_(geology)

    In ore deposit geology, supergene processes or enrichment are those that occur relatively near the surface as opposed to deep hypogene processes. Supergene processes include the predominance of meteoric water circulation (i.e. water derived from precipitation) with concomitant oxidation and chemical weathering.

  5. Unified Soil Classification System - Wikipedia

    en.wikipedia.org/wiki/Unified_Soil...

    The Unified Soil Classification System (USCS) is a soil classification system used in engineering and geology to describe the texture and grain size of a soil. The classification system can be applied to most unconsolidated materials, and is represented by a two-letter symbol. Each letter is described below (with the exception of Pt):

  6. Parent material - Wikipedia

    en.wikipedia.org/wiki/Parent_material

    Parent material is the underlying geological material (generally bedrock or a superficial or drift deposit) in which soil horizons form. Soils typically inherit a great deal of structure and minerals from their parent material, and, as such, are often classified based upon their contents of consolidated or unconsolidated mineral material that has undergone some degree of physical or chemical ...

  7. Soil - Wikipedia

    en.wikipedia.org/wiki/Soil

    Soil consists of a solid phase of minerals and organic matter (the soil matrix), as well as a porous phase that holds gases (the soil atmosphere) and water (the soil solution). [ 1 ] [ 2 ] Accordingly, soil is a three- state system of solids, liquids, and gases. [ 3 ]

  8. Cheluviation - Wikipedia

    en.wikipedia.org/wiki/Cheluviation

    The eluviation of chelate compounds is the downward movement of soil chelates. The eluviation of chelate compounds can be affected by: Acidity. Organic acids produced under acidic conditions can increase the solubility of metal elements such as iron and aluminum, thereby enhancing soil eluviation. Iron and aluminum are easily leached at low pH.

  9. Soil fertility - Wikipedia

    en.wikipedia.org/wiki/Soil_fertility

    Phosphorus is a primary factor of soil fertility as it is an element of plant nutrients in the soil. It is essential for cell division and plant development, especially in seedlings and young plants. [10] However, phosphorus is becoming increasingly harder to find and its reserves are starting to be depleted due to the excessive use as a ...