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You can roughly estimate the approximate amount of sand, silt and clay in a soil by a simple method called "manual texturing." The texture is determined by the feel of the moist sample when rubbed between the thumb and forefinger.
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gardenline.usask.ca/misc/soil.html
gardenline.usask.ca/misc/soil.html
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Soils are composed of organic matter (stuff that used to be alive, like plants and animals) and small inorganic matter. There are three basic soil types: sand, silt, and clay. Sand is comprised of tiny rock fragments and is the roughest in texture.
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scene.asu.edu/habitat/activities/soil_tests.html
scene.asu.edu/habitat/activities/soil_tests.html
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There are thousands of different kinds of soil. Factors which cause soils to differ from each other include color, texture (sand, silt, clay), stoniness, wetness, slope, amount of organic matter and soil permeability or how well water moves through the soil...
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www.washtenawcd.org/az/soilwhat.php
www.washtenawcd.org/az/soilwhat.php
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Soil Types ... Sand, Loamy sand, Sandy loam ... Medium loam, Sandy clay loam, Silt Loam...
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www.recreational-land.co.uk/soil-classification.htm
www.recreational-land.co.uk/soil-classification.htm
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Determining soil texture from sand, silt, and clay content ... The following files and ARC/INFO AML instructions calculate soil texture based on the values of sand, silt and clay found in the Soil Layer File (SLF). The calculations are based on the definitons found in the CanSIS manual for describing soils in the field...
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res.agr.ca/cansis/procedures/texture.html
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clay_1km_alb.bsq.gz -- Gridded clay percent, 8-bit binary array [234 kbyte] ... fractgrid -- Arc/Info directory for gridded soil fractions data ... sand_1km_alb.bsq.gz -- Gridded sand percent, 8-bit binary array [264 kbyte]
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dbwww.essc.psu.edu/cgi-bin/geotree/list_datafiles.pl?19...
dbwww.essc.psu.edu/cgi-bin/geotree/list_datafiles.pl?1997-0122
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Soil Textural Triangle ... Texture class can be determined fairly well in the field by feeling the sand particles and estimating silt and clay content by flexibility and stickiness. There is no field mechanical-analysis procedure that is as accurate as the fingers of an experienced scientist, especially if standard samples...
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soils.usda.gov/education/resources/k_12/lessons/texture...
soils.usda.gov/education/resources/k_12/lessons/texture/
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However, it did not take me long to discover that there was a plentiful supply of similar and equally interesting sand-like materials available for collecting as well, namely clay, silt, soil and even mud.
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www.sand-collecting.org/articles/clays.htm
www.sand-collecting.org/articles/clays.htm
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Sand, silt, and clay are names that describe the size of individual particles in the soil. ... Clay are the smallest sized particles, and they feel "sticky" and they are hard to squeeze...
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soil.gsfc.nasa.gov/pvg/texture1.htm
soil.gsfc.nasa.gov/pvg/texture1.htm
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