USDA (United States Department of Agriculture)

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SVSoils

 

 

The USDA method of classification is used to provide a textural description of the soil. A grain-size distribution is all that is required to perform classification by the USDA method. More specifically, the USDA %sand and USDA %clay properties of a particular soil obtained from the Grain-size dialog are used as the basis for the classification. The USDA classification method is implemented as presented in the following paper.

 

The following textural categories and their abbreviations are shown below.

 

Texture

Abbreviation

Sand

Sa

Loamy sand

L Sa

Sandy loam

Sa L

Loam

L

Silt loam

Si L

Silt

Si

Sandy clay loam

Sa C L

Clay loam

C L

Silty clay loam

Si C L

Sandy clay

Sa C

Silty clay

Si C

Clay

C