Stricter than the vertic *properties*: the vertic *horizon* requires
\>= 30% clay throughout, slickensides at \>= "common" level, AND
shrink-swell cracks \>= 0.5 cm wide. Used by Vertisols. v0.9.19
adds an OR-alternative COLE-based linear-extensibility path:
summed (cole_value * thickness) over the upper 100 cm
\>= 6 cm passes the diagnostic even when slickensides + cracks
are not recorded (KST 13ed Ch 16 LE alternative, p 343).
Usage
vertic_horizon(
pedon,
min_clay = 30,
min_thickness = 25,
min_le_cm = 6,
le_max_depth_cm = 100
)Arguments
- pedon
A
PedonRecord.- min_clay
Numeric threshold or option (see Details).
- min_thickness
Numeric threshold or option (see Details).
- min_le_cm
Minimum LE sum (cm) for the COLE-based path (default 6, per KST 13ed Ch 16).
- le_max_depth_cm
Depth window (cm) for the COLE-based path (default 100).
v0.9.72 designation morphological inference (opt-in)
Field-described Brazilian Vertissolos profiles (e.g.\ the Embrapa
Redape curated dataset) encode vertic morphology via a v
master-letter modifier in the horizon designation (Bv,
Bvk1, Cv, Cvz) without recording
slickensides class or shrink_swell_cracks_cm as
numeric inputs. With
options(soilKey.vertic_designation_inference = TRUE) the
function accepts a layer as vertic when the canonical and COLE
paths both fail or are NA AND the layer has clay_pct >=
min_clay AND its designation matches a v master-letter
modifier. Default is FALSE.