Particle Size Distribution - Enviro-Soil

Chapter 3 Examination and Description of Soils SOIL SURVEY MANUAL 60 Soil Survey Division Staff - USDA Handbook No. 18. 1993 Particle size Distribution This section discusses Particle Distribution . The finer sizes are called fine earth (smaller than 2 mm diameter) as distinct from rock fragments (pebbles, cobbles, stones, and boulders). Particle - size Distribution of fine earth or less than 2 mm is determined in the field mainly by feel. The content of rock fragments is determined by estimating the proportion of the soil volume that they occupy. Chapter 3 Examination and Description of Soils SOIL SURVEY MANUAL 61 Soil Survey Division Staff - USDA Handbook No. 18. 1993 Soil Separates The United States Department of Agriculture uses the following size separates for the <2 mm mineral material: Very coarse sand: mm Coarse sand: mm Medium sand: mm Fine sand: mm Very fine sand: mm Silt: mm Clay: < mm Figure 3-14 compares the USDA system with others.

Even locally, the relationships that are useful for judging texture of one kind of soil may not apply as well to another kind. FIGURE 3-15 Sizes of particles of indicated diameters (d) in millimeters. Chapter 3¾Examination and Description of Soils SOIL SURVEY MANUAL 63

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  Distribution, Size, Particles, Judging, Particle size distribution

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