aqp: crit.clay.argillic – R documentation

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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.

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.

Details

Uses the standard equations for clay contents less than 15 \ and 40 \ the definition of the argillic horizon from 12th Edition Keys to Soil Taxonomy (Soil Survey Staff, 2014).

Value

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

Note

This function is intended for identifying clay content threshold required for an argillic horizon. These thresholds may not apply depending on the specifics of your soil. E.g. if the upper part of argillic has been plowed (has Ap immediately over upper boundary) the clay increase requirement can be waived (Soil Survey Staff, 2014).

Author(s)

Andrew Gene Brown

References

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

Examples

# 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))

aqp

Algorithms for Quantitative Pedology

v1.29

GPL (>= 3)

Authors

Dylan Beaudette [aut, cre], Pierre Roudier [aut, ctb], Andrew Brown [aut, ctb]

Initial release

2021-04-05