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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.

  3. Feoffment - Wikipedia

    en.wikipedia.org/wiki/Feoffment

    Thus the conveyance (i.e. delivery) of land to the new tenant, known as the delivery of seisin, was generally effected on the land itself in a symbolic ceremony termed "feoffment with [de]livery of seisin." In the ceremony, the parties would go to the land with witnesses "and the transferor would then hand to the transferee a lump of soil or a ...

  4. 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.

  5. Contour plowing - Wikipedia

    en.wikipedia.org/wiki/Contour_plowing

    The Soil Conservation Service worked with state governments and universities with established agriculture programs, such as the University of Nebraska, to promote the method to farmers. By 1938, the introduction of new agricultural techniques, such as contour plowing, had reduced soil loss by 65% despite the continuation of the drought.

  6. Chernozem - Wikipedia

    en.wikipedia.org/wiki/Chernozem

    Chernozem (/ ˈ tʃ ɜːr n ə z ɛ m / CHUR-nə-zem), [a] also called black soil, regur soil or black cotton soil, is a black-colored soil containing a high percentage of humus [3] (4% to 16%) and high percentages of phosphorus and ammonia compounds. [4] Chernozem is very fertile soil and can produce high agricultural yields with its high ...

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