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Custom Soil Resource Report <br /> Particle Size and Coarse Fragments <br /> This table shows estimates of particle size distribution and coarse fragment content <br /> of each soil in the survey area. The estimates are based on field observations and <br /> on test data for these and similar soils. <br /> Depth to the upper and lower boundaries of each layer is indicated. <br /> Particle size is the effective diameter of a soil particle as measured by <br /> sedimentation, sieving, or micrometric methods. Particle sizes are expressed as <br /> classes with specific effective diameter class limits. The broad classes are sand, <br /> silt, and clay, ranging from the larger to the smaller. <br /> Sand as a soil separate consists of mineral soil particles that are 0.05 millimeter to 2 <br /> millimeters in diameter. In this table, the estimated sand content of each soil layer is <br /> given as a percentage, by weight, of the soil material that is less than 2 millimeters <br /> in diameter. <br /> Silt as a soil separate consists of mineral soil particles that are 0.002 to 0.05 <br /> millimeter in diameter. In this table, the estimated silt content of each soil layer is <br /> given as a percentage, by weight, of the soil material that is less than 2 millimeters <br /> in diameter. <br /> Clay as a soil separate consists of mineral soil particles that are less than 0.002 <br /> millimeter in diameter. In this table, the estimated clay content of each soil layer is <br /> given as a percentage, by weight, of the soil material that is less than 2 millimeters <br /> in diameter. <br /> The content of sand, silt, and clay affects the physical behavior of a soil. Particle <br /> size is important for engineering and agronomic interpretations, for determination of <br /> soil hydrologic qualities, and for soil classification. <br /> The amount and kind of clay affect the fertility and physical condition of the soil and <br /> the ability of the soil to adsorb cations and to retain moisture. They influence shrink- <br /> swell potential, saturated hydraulic conductivity(Ksat), plasticity, the ease of soil <br /> dispersion, and other soil properties. The amount and kind of clay in a soil also <br /> affect tillage and earthmoving operations. <br /> Total fragments is the content of fragments of rock and other materials larger than 2 <br /> millimeters in diameter on volumetric basis of the whole soil. <br /> Fragments 2-74 mm refers to the content of coarse fragments in the 2 to 74 <br /> millimeter size fraction. <br /> Fragments 75-249 mm refers to the content of coarse fragments in teh 75 to 249 <br /> millimeter size fraction. <br /> Fragments 250-599 mm refers to the content of coarse fragments in the 250 to 599 <br /> millimeter size fraction. <br /> Fragments >=600 mm refers to the content of coarse fragments in the greater than <br /> or equal to 600 millimeter size fraction. <br /> Reference: <br /> United States Department of Agriculture, Natural Resources Conservation Service. <br /> National soil survey handbook, title 430-VI. (http://soils.usda.gov) <br /> 66 <br />