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  2. Topsoil - Wikipedia

    en.wikipedia.org/wiki/Topsoil

    Topsoil is composed of mineral particles and organic matter and usually extends to a depth of 5-10 inches (13–25 cm). Together these make a substrate capable of holding water and air which encourages biological activity. There are generally a high concentration of roots in topsoil since this is where plants obtain most of their vital nutrients.

  3. Structural Soil - Wikipedia

    en.wikipedia.org/wiki/Structural_Soil

    Structural Soil is a medium that can be compacted to pavement design and installation requirements while permitting root growth. It is a mixture of gap-graded gravels (mostly made of crushed stone) and soil (mineral content and organic content). It provides an integrated, root penetrable, high strength pavement system that shifts design away ...

  4. Soil fertility - Wikipedia

    en.wikipedia.org/wiki/Soil_fertility

    Topsoil or horizon O is with sufficient soil organic matter for healthy soil structure and soil moisture retention; Soil pH in the range 5.5 to 7.0 (suitable for most plants but some prefer or tolerate more acid or alkaline conditions); Adequate concentrations of essential plant nutrients in plant-available forms;

  5. Soil - Wikipedia

    en.wikipedia.org/wiki/Soil

    A pH of 3.5 has one million times more hydronium ions per litre than a solution with pH of 9.5 (9.5 − 3.5 = 6 or 10 6) and is more acidic. [ 115 ] The effect of pH on a soil is to remove from the soil or to make available certain ions.

  6. Cut and fill - Wikipedia

    en.wikipedia.org/wiki/Cut_and_fill

    A mass haul diagram where land and rock cuts are hauled to fills Fill construction in 1909 Cut and fill software: view from above. In earthmoving, cut and fill is the process of constructing a railway, road or canal whereby the amount of material from cuts roughly matches the amount of fill needed to make nearby embankments to minimize the amount of construction labor.

  7. Soil formation - Wikipedia

    en.wikipedia.org/wiki/Soil_formation

    The soil production rate due to weathering is approximately 1/10 mm per year. [5] New soils can also deepen from dust deposition. Gradually soil is able to support higher forms of plants and animals, starting with pioneer species and proceeding along ecological succession to more complex plant and animal communities. [6]

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