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  2. Soil color - Wikipedia

    en.wikipedia.org/wiki/Soil_color

    Soil color is often the most visually apparent property of soil. While color itself does not influence the behavior or practical use of soils, [ 1 ] it does indicate important information about the soil organic matter content, mineralogy , moisture, and drainage.

  3. Humus - Wikipedia

    en.wikipedia.org/wiki/Humus

    Humus has a characteristic black or dark brown color and is an accumulation of organic carbon. Besides the three major soil horizons of (A) surface/topsoil, (B) subsoil, and (C) substratum, some soils have an organic horizon (O) on the very surface. Hard bedrock (R) is not in a strict sense soil.

  4. USDA soil taxonomy - Wikipedia

    en.wikipedia.org/wiki/USDA_soil_taxonomy

    A soil family category is a group of soils within a subgroup and describes the physical and chemical properties which affect the response of soil to agricultural management and engineering applications. The principal characteristics used to differentiate soil families include texture, mineralogy, pH, permeability, structure, consistency, the ...

  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. Sapric - Wikipedia

    en.wikipedia.org/wiki/Sapric

    Muck soils are defined by the USDA NRCS as sapric organic soils that are saturated more than 30 cumulative days in normal years or are artificially drained. [6] An example would be a soil made up primarily of humus from drained swampland .

  7. Soil morphology - Wikipedia

    en.wikipedia.org/wiki/Soil_morphology

    Soil morphology is the branch of soil science dedicated to the technical description of soil, [1] particularly physical properties including texture, color, structure, and consistence. Morphological evaluations of soil are typically performed in the field on a soil profile containing multiple horizons .

  8. Soil classification - Wikipedia

    en.wikipedia.org/wiki/Soil_classification

    A full geotechnical engineering soil description will also include other properties of the soil including color, in-situ moisture content, in-situ strength, and somewhat more detail about the material properties of the soil than is provided by the USCS code. The USCS and additional engineering description is standardized in ASTM D 2487. [4]

  9. Soil horizon - Wikipedia

    en.wikipedia.org/wiki/Soil_horizon

    The mineral soil surface is the upper limit of the uppermost layer consisting of mineral material. A soil layer is a zone in the soil, approximately parallel to the soil surface, with properties different from layers above and/or below it. If at least one of these properties is the result of soil-forming processes, the layer is called a soil ...

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