The percentages of sand, silt, and clay may be tested in the lab. }); /*dom.query(document).ready(function(){ The 12 sections of the triangle correspond to the 12 soil categories. if(imgMarginLeft.indexOf("px") > 0){ for the respective texture. USDA/ARS 1999. Pullman, WA 99164-6120 These textural classes are defined in Table 4 and they are represented in Table 6. To classify a soil sample, you find the intersection of the three lines that correspond the three proportions. Divide the sand measurement by the total. The triangle is used by extending lines from the appropriate starting points, parallel to the side of the triangle, counterclockwise to the side where the line began. Generalize: Calculate the percentage of sand, silt, and clay. } var imgAlt = dom_i.query(this).attr("alt") == undefined ? '' } Experiment with different sand/clay/silt values to find out } A soil texture triangle showing soil textures as determined by the proportion of sand, silt and clay (view large version) Texture is important because it influences: the amount of water the soil can hold; the rate of water movement through the soil; how workable and fertile the soil is. Soils may be assigned to textural classes depending on the proportions of sand, silt and clay-size particles. The estimator is based on the texture class intervals of the Soil Survey of England and Wales - note that other international standards also exist, such as the USDA and FAO triangles. RedBlueGreenBlackYellowOrange dom_i.query(this).attr("title",imgAlt); Texture is an important soil characteristic that is routinely determined in many soils-related studies. Create a directory on your hard disk (I.e. Uses. and select "Save image as"). Soil classification Clay Soil Loam soil Sandy soil percent clay 40-100% 7-27% 1-10% percent silt 0-40% 28-50% 1-15% percent sand 0-45% 23-52% 85-100% 14. imgMarginRight = imgMarginRight.replace("px",""); : dom_i.query(this).attr("alt").trim(); Determine and calculate the amount of sand, silt and clay in a given soil sample. Also save the triangle image to directory with the Field capcity is the fractional water content at 1/3 bar tension. Use this online tool to calculate a single point texture class based on percent sand, silt, and clay. To use the utility, simply click on the grphtext.htm document icon. 10 : dom_i.query(this).css("margin-top").trim(); if(imgAlt != 'Broken Link' && imgAlt != '' && imgAlt != 'offsite link image'){ Including the optional sand fractions will refine the calculation. *Coarse Sand: Press the [Texture] button to use the Soil Texture Triangle: Hydraulic properties calculator to select the texture and estimate hydraulic properties. if(imgTitle != ''){ dom_i.query(this).css("margin","0"); The soil texture of the first soil layer is used in RUSLE erosion calculations . : dom_i.query(this).css("margin-bottom").trim(); A more precise determine of soil texture can be determine from percent sand silt and clay using the soil triangle. One side of the triangle represents percent sand, the second side represents percent clay, and the third side represents percent silt. Those findings are plugged into a texture analysis triangle (see chart below) to determine soil classification. 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