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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. Hardpan - Wikipedia

    en.wikipedia.org/wiki/Hardpan

    Hardpan. In soil science, agriculture and gardening, hardpan or soil pan is a dense layer of soil, usually found below the uppermost topsoil layer. [ 1] There are different types of hardpan, all sharing the general characteristic of being a distinct soil layer that is largely impervious to water. Some hardpans are formed by deposits in the soil ...

  4. 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 ...

  5. Soil in the United States - Wikipedia

    en.wikipedia.org/wiki/Soil_in_the_United_States

    In the United States, over 19,000 soil series have been identified. [1] The percentages of land area (in the US and associated territories, etc.) occupied by soils of the twelve orders have been estimated [1] as: Alfisols and Inceptisols occur widely in the US, but the circumstances of their occurrence would be difficult to characterize briefly.

  6. Fertiliser use in Nepal - Wikipedia

    en.wikipedia.org/wiki/Fertiliser_use_in_Nepal

    The annual average fertiliser requirement in Nepal to replenish the soil nutrition is 310 kg per hectare but only 29 kg of fertiliser is added to the soil. [1] Fifty per cent of nutrient loss from the soil occurs during the early monsoon. [2] The use of fertiliser is relatively new to Nepal.

  7. Soil formation - Wikipedia

    en.wikipedia.org/wiki/Soil_formation

    Soil formation. Soil formation, also known as pedogenesis, is the process of soil genesis as regulated by the effects of place, environment, and history. Biogeochemical processes act to both create and destroy order ( anisotropy) within soils.

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