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  2. Bulk soil - Wikipedia

    en.wikipedia.org/wiki/Bulk_soil

    Bulk soil is soil outside the rhizosphere that is not penetrated by plant roots. The bulk soil is like an ecosystem, it is made up of many things such as: nutrients, ions, soil particles, and root exudates. There are many different interactions that occur between all the members of the bulk soil. Natural organic compounds are much lower in bulk ...

  3. USDA soil taxonomy - Wikipedia

    en.wikipedia.org/wiki/USDA_soil_taxonomy

    A taxonomy is an arrangement in a systematic manner; the USDA soil taxonomy has six levels of classification. They are, from most general to specific: order, suborder, great group, subgroup, family and series. Soil properties that can be measured quantitatively are used in this classification system – they include: depth, moisture ...

  4. Alfisol - Wikipedia

    en.wikipedia.org/wiki/Alfisol

    Alfisol paleosol cut by stream channel sandstone in Middle Devonian Oneonta Formation near East Windham, New York. The Mata Amarilla Formation, a formation in the Austral Basin in southern Patagonia, Argentina is the location known for the preservation of podocarp-dominated fossil forests. In the eastern area of the middle section of the Mata ...

  5. Sapric - Wikipedia

    en.wikipedia.org/wiki/Sapric

    Sapric. A sapric is a subtype of a histosol [1] where virtually all of the organic material has undergone sufficient decomposition to prevent the identification of plant parts. [2] [3] Muck is a sapric soil that is naturally waterlogged or is artificially drained.

  6. Soil organic matter - Wikipedia

    en.wikipedia.org/wiki/Soil_organic_matter

    Soil organic matter (SOM) is the organic matter component of soil, consisting of plant and animal detritus at various stages of decomposition, cells and tissues of soil microbes, and substances that soil microbes synthesize. SOM provides numerous benefits to the physical and chemical properties of soil and its capacity to provide regulatory ...

  7. Soil in the United States - Wikipedia

    en.wikipedia.org/wiki/Soil_in_the_United_States

    Soils are the product of climate, organisms and topography, acting on parent (geologic) material over time. Thus the great diversity of geologic materials, geomorphic processes, climatic conditions, biotic assemblages and land surface ages in the United States is responsible for the presence of an enormous variety of mineral and organic soils.

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