USDA SOIL TEXTURING FIELD FLOW CHART
Single-sided, plastic-coated guide
for assisting with soil texturing procedures and assigning a Texture
Class using the USDA texture triangle. The Flow Chart uses step-wise
procedures (adopted from Foth and others, 1992) for estimating sand,
silt, and clay content.
The Flow Chart uses the ribbon method to estimate the fine-grained
fraction followed by placing the fraction within the texture triangle
to determine Texture Class (ex: sandy loam). The guide provides
instruction for determining Subclass (ex: fine sandy loam) and
assigning Textural Class Modifiers for rock fragments greater than 2mm
(ex: gravelly silt loam) and organic Compositional Textural Modifiers
(ex: peaty sandy clay loam).
Awarded Citation as Outstanding Geologic Literature by A.W. Hatheway and
others / Engineering Geology 70 (2003).
|
