aqp (version 1.18)

crit.clay.argillic: Determines threshold (minimum) clay content for argillic upper bound

Description

Given a vector or matrix of "eluvial" horizon clay contents (%), crit.clay.argillic() returns a vector or matrix of minimum clay contents (thresholds) that must be met for an argillic horizon clay increase.

Uses the standard equations for clay contents less than 15 %, between 15 and 40 %, and greater than 40 %. Based on the clay increase criteria in the definition of the argillic horizon from 12th Edition Keys to Soil Taxonomy (Soil Survey Staff, 2014).

Usage

crit.clay.argillic(eluvial_clay_content)

Arguments

eluvial_clay_content

A numeric vector or matrix containing clay contents of potential "eluvial" horizons. May contain NA.

Value

A vector or matrix (input-dependent) containing minimum "illuvial" horizon clay contents (thresholds) to be met for argillic horizon clay increase.

References

Soil Survey Staff. 2014. Keys to Soil Taxonomy, 12th ed. USDA-Natural Resources Conservation Service, Washington, DC.

See Also

getArgillicBounds, get.increase.matrix

Examples

# NOT RUN {
# crit.clay.argillic uses different equations for clay content
# less than 15 %, between 15 and 40 %, and >40 %

crit.clay.argillic(eluvial_clay_content=c(5, 20, 45))
# }