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  2. AASHTO Soil Classification System - Wikipedia

    en.wikipedia.org/wiki/AASHTO_Soil_Classification...

    Printable version; In other projects Wikidata item; ... A-2-4 A-2-5 A-2-6 A-2-7 ... fine sand silty or clayey gravel and sand

  3. Unified Soil Classification System - Wikipedia

    en.wikipedia.org/wiki/Unified_Soil...

    sand ≥ 50% of coarse fraction passes No.4 (4.75 mm) sieve clean sand SW well-graded sand, fine to coarse sand SP poorly graded sand sand with >12% fines SM silty sand SC clayey sand Fine grained soils 50% or more passing the No.200 (0.075 mm) sieve silt and clay liquid limit < 50 inorganic: ML silt CL lean clay organic: OL organic silt ...

  4. What is mulch and do you really need it? - AOL

    www.aol.com/mulch-really-164011430.html

    You can find bags of organic mulch, like this dye-free wood Miracle-Gro mulch, for under $4 or Vigoro mulch in black, red or brown for around $3 at Home Depot.

  5. Mulch - Wikipedia

    en.wikipedia.org/wiki/Mulch

    Woodchip mulch is a byproduct of reprocessing used (untreated) timber (usually packaging pallets), to dispose of wood waste. The chips are used to conserve soil moisture, moderate soil temperature and suppress weed growth. Woodchip mulch is often used under trees, shrubs or large planting areas and can last much longer than arborist mulch.

  6. Sieve analysis - Wikipedia

    en.wikipedia.org/wiki/Sieve_analysis

    A sieve analysis (or gradation test) is a practice or procedure used in geology, civil engineering, [1] and chemical engineering [2] to assess the particle size distribution (also called gradation) of a granular material by allowing the material to pass through a series of sieves of progressively smaller mesh size and weighing the amount of material that is stopped by each sieve as a fraction ...

  7. Permeability of soils - Wikipedia

    en.wikipedia.org/wiki/Permeability_of_soils

    The coefficient of permeability varies with the void ratio as e/sup>/(1+e). For a given soil, the greater the void ratio, the higher the value of the coefficient of permeability. Here 'e' is the void ratio. Based on other concepts it has been established that the permeability of a soil varies as e 2 or e 3 /(1+e). Whatever may be the exact ...

  8. Soil texture - Wikipedia

    en.wikipedia.org/wiki/Soil_texture

    The first classification, the International system, was first proposed by Albert Atterberg in 1905 and was based on his studies in southern Sweden. Atterberg chose 20 μm for the upper limit of silt fraction because particles smaller than that size were not visible to the naked eye, the suspension could be coagulated by salts, capillary rise within 24 hours was most rapid in this fraction, and ...

  9. Sheet mulching - Wikipedia

    en.wikipedia.org/wiki/Sheet_mulching

    Sheet mulch has important advantages relative to conventional methods, such as tilling, plowing or applying herbicides: Improvement of desirable plants' health and productivity. [1] Retention of water and nutrients and stabilization of biochemical cycles. [1] Improvement of soil structure, soil life, and prevention of soil erosion. [1] [8]

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