Soil survey manual 1993

Soil Map Information Orders of Soil Surveys

To use the textural triangle: If a soil contains 15% or more rock fragments, a rock fragment content modifier is added to the soil’s texture class.


The textural classes are defined by their relative proportions of sand, silt, and clay as shown in the USDA textural triangle (F. Each textural class name indicates the size of the mineral particles that are dominant in the soil.


Soil pH - pedia

Texture can be estimated in the field by manipulating and feeling the soil between the thumb and fingers, but should be quantified by laboratory particle size analysis.

Notes on Soil Survey Geographic

Mineral grains which are Determining textural class with the textural triangle There are 12 primary classes of soil texture defined by the USDA (Soil Survey Division Staff, 1993).

Soil survey manual 1993:

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