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What percentage of gravel is in clay soil?

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Shape of grains. Shape characteristics of SAND grains; Shape characteristics of CLAY grains; Specific surface. The majority of soils may be regarded as either SANDS or CLAYS: SANDS include gravelly sands and gravel-sands. read more

Clay soil may have some silt in it, especially if it’s clay loam. This diagram will help - although even it has no category for gravel. This page may be out of date. read more

The soil textural triangle is used to determine soil type based on sand, silt and clay percentages. Background. Particle size analysis (PSA) determines the relative amounts of sand, silt and clay in a soil. These size fractions are the mineral component of a soil and together determine soil texture. read more

Firstly avoid the gravels from whole soil by pass it through 2 mm sieve, then calculate the percentage of sand, silt, and clay. Finally, determine the soil texture using USDA soil texture triangle. read more

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Further Research

Measuring Soil Texture in the Lab
www.soilquality.org.au

Soil void ratio
www.geotechdata.info