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  2. Soil texture - Wikipedia

    en.wikipedia.org/wiki/Soil_texture

    For example, if a soil is 70 percent sand and 10 percent clay then the soil is classified as a sandy loam. The same method can be used starting on any side of the soil triangle. If the texture by feel method was used to determine the soil type, the triangle can also provide a rough estimate on the percentages of sand, silt, and clay in the soil.

  3. Unified Soil Classification System - Wikipedia

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

    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, organic clay: silt and clay liquid limit ≥ 50 inorganic MH elastic silt CH ...

  4. Atterberg limits - Wikipedia

    en.wikipedia.org/wiki/Atterberg_limits

    The PI is the difference between the liquid and plastic limits (PI = LL-PL). Soils with a high PI tend to be clay, those with a lower PI tend to be silt, and those with a PI of 0 (non-plastic) tend to have little or no silt or clay. Soil descriptions based on PI: [8] (0) – Non-plastic (<7) – Slightly plastic (7-17) – Medium plastic

  5. Clay, sand, silt, loam: How different soils affect gardens - AOL

    www.aol.com/news/clay-sand-silt-loam-different...

    Both extremes in soil have their advantages and shortcomings. Sand particles are relatively large (by definition from 2- to 5-hundredths of a millimeter across). Clay particles are very small (by ...

  6. Physical properties of soil - Wikipedia

    en.wikipedia.org/wiki/Physical_properties_of_soil

    Soil texture is determined by the relative proportion of the three kinds of soil mineral particles, called soil separates: sand, silt, and clay. At the next larger scale, soil structures called peds or more commonly soil aggregates are created from the soil separates when iron oxides , carbonates , clay, silica and humus , coat particles and ...

  7. Soil classification - Wikipedia

    en.wikipedia.org/wiki/Soil_classification

    Soil texture triangle showing the USDA classification system based on grain size. For soil resources, experience has shown that a natural system approach to classification, i.e. grouping soils by their intrinsic property (soil morphology), behaviour, or genesis, results in classes that can be interpreted for many diverse uses.

  8. Loam - Wikipedia

    en.wikipedia.org/wiki/Loam

    Soil types by clay, silt and sand composition as used by the United States Department of Agriculture. Loam (in geology and soil science) is soil composed mostly of sand (particle size > 63 micrometres (0.0025 in)), silt (particle size > 2 micrometres (7.9 × 10 −5 in)), and a smaller amount of clay (particle size < 2 micrometres (7.9 × 10 −5 in)).

  9. Water retention curve - Wikipedia

    en.wikipedia.org/wiki/Water_retention_curve

    In 1907, Edgar Buckingham created the first water retention curve. [2] It was measured and made for six soils varying in texture from sand to clay. The data came from experiments made on soil columns 48 inch tall, where a constant water level maintained about 2 inches above the bottom through periodic addition of water from a side tube.

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