Soil is composed of particles that are categorized into groups according to thei
ID: 283220 • Letter: S
Question
Soil is composed of particles that are categorized into groups according to their size. One method of classifying soils is to measure the relative amounts of sand, silt, and clay in a soil sample, then use a soil triangle to determine the soil type. Below, you have been given percentages of particle sizes found in six different soil types. On the texture triangle shown below, each particle size has its own line direction as shown by the arrow associated with the particle size names. To find the texture designation, follow the line associated with the percent of the given size group until the line meets up with those from the other two particle sizes.
Particle size distribution: Soil texture:
20% silt, 10% clay, 70% sand ____________________________________
30% sand, 10% clay, 60% silt ____________________________________
10% silt, 50% sand, 40% clay ____________________________________
30% clay, 30% sand, 40% silt ____________________________________
60% clay, 10% sand, 30% silt ____________________________________
What are the proportions for a typical loam?
Clay _________% Sand ___________% Silt ___________%
100 90 10 80 20 70 30 CLAY 40 0/50 50 ? SILTY CLAY 40 SANDY 60 CLAY CLAY LOAMSILTY CLAY LOAM 30 70 SANDY CLAY LOAM 20 80 LOAM/SILT LOAM SANDY LOAM 10 90 LOAMY SILT SAND SAND 100 100 9080 70 60 50 40 30 20 10 Percent SandExplanation / Answer
Particle size distribution: Soil texture:
20% silt, 10% clay, 70% sand - Sandy loam
30% sand, 10% clay, 60% silt - Silt loam
10% silt, 50% sand, 40% clay - Sandy clay
30% clay, 30% sand, 40% silt - Clay loam
60% clay, 10% sand, 30% silt - Clay
Soil textures can be determined by above triangle diagram with respective presence of Sand, Silt and Clay percent propositions.
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