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  2. 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.

  3. Unified Soil Classification System - Wikipedia

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

    gravel with >12% fines GM silty gravel GC clayey gravel 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 ...

  4. Mulch - Wikipedia

    en.wikipedia.org/wiki/Mulch

    The effect of mulch upon soil moisture content is complex. Mulch forms a layer between the soil and the atmosphere reducing evaporation. [11] However, mulch can also prevent water from reaching the soil by absorbing or blocking water from light rains and overly thick layers of mulch can reduce oxygen in the soil. [12]

  5. 13 Types of Mulch—and How to Choose the Right One for ... - AOL

    www.aol.com/13-types-mulch-choose-one-161544188.html

    Generally, you'll apply mulch 2 to 3 inches deep, with the exception of grass clippings, which you should keep to a depth of 1 to 2 inches.. Be sure to avoid building mulch "volcanos" against tree ...

  6. 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]

  7. Soil texture - Wikipedia

    en.wikipedia.org/wiki/Soil_texture

    Soil texture focuses on the particles that are less than two millimeters in diameter which include sand, silt, and clay. The USDA soil taxonomy and WRB soil classification systems use 12 textural classes whereas the UK-ADAS system uses 11. [1] These classifications are based on the percentages of sand, silt, and clay in the soil.

  8. 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 ...

  9. 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 ...

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