The diagram below is soil textural triangle from the US Department of Agricultur
ID: 298502 • Letter: T
Question
The diagram below is soil textural triangle from the US Department of Agriculture.
The diagram shows how to determine soil texture based on the approximate percentage of soil size grades of a soil sample. For example, if a soil sample has about 40% silt, 40% sand, and 20% clay, its texture is called loam (point (A) in the triangle. From the silt side, you follow the line down left; from the sand side, you follow the line up left; from the clay side, you follow the line straight right.
Use the soil texture triangle to name the following by its correct texture class.
a.17% sand, 28% silt, 55% clay:
b.31% sand, 55% silt, 14% clay:
c.60% sand, 35% silt, 5% clay:
d.5% sand, 57% silt, 38% clay:
Determine the percentage of each particle size grade for the B example plotted on the triangle.
Sand: %
Silt: %
Clay: %
Determine the percentage of each particle size grade for the C example plotted on the triangle.
Sand: %
Silt: %
Clay: %
Soil Textural Triangle 100 90 80 70 clay 60 silty 50 clay Sandy 40 clay silty clay loam clay loam 30 B sandy clay loam (A) 20 loam silt loam sandy loam 10 loamy sand sand Sand Separate, siltExplanation / Answer
Naming of soil texture based on soil texture triangle is as follows:
a.17% sand, 28% silt, 55% clay: CLAY
b.31% sand, 55% silt, 14% clay: SILT LOAM
c.60% sand, 35% silt, 5% clay: SANDY LOAM
d.5% sand, 57% silt, 38% clay: SILT CLAY LOAM
Determine the percentage of each particle size grade for the B example plotted on the triangle.
Sand: 65%
Silt: 5%
Clay: 30%
Determine the percentage of each particle size grade for the C example plotted on the triangle.
(There is no C in the diagram. A is there and plotted for A)
Sand: 40%
Silt: 40%
Clay: 20%