% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/diagnostics-properties-wrb.R
\name{vertic_properties}
\alias{vertic_properties}
\title{Vertic properties (WRB 2022)}
\usage{
vertic_properties(
  pedon,
  min_clay = 30,
  min_thickness = 25,
  slickenside_levels = c("common", "many", "continuous")
)
}
\arguments{
\item{pedon}{A \code{\link{PedonRecord}}.}

\item{min_clay}{Minimum clay percent (default 30, per WRB 2022).}

\item{min_thickness}{Minimum thickness (cm) of the vertic layer
(default 25 per WRB 2022 Ch 3.2.x).}

\item{slickenside_levels}{Vector of \code{slickensides} values
accepted as evidence (default \code{c("common", "many",
"continuous")}).}
}
\value{
A \code{\link{DiagnosticResult}}.
}
\description{
Tests whether any horizon shows vertic properties -- shrink-swell
clay behaviour evidenced by slickensides, wedge-shaped peds, and
deep cracks. Diagnostic for Vertisols.
}
\details{
Sub-tests:
\itemize{
  \item \code{test_clay_above} -- clay >= 30\%
  \item \code{test_slickensides_present} -- slickensides at
        or above the "common" level
  \item \code{test_minimum_thickness} -- combined vertic layer
        thickness >= 25 cm (v0.3.1 added per WRB 2022)
}

v0.3.1: thickness gate added. Limitations remaining: WRB also accepts
deep cracks (>= 1 cm wide extending from the surface to >= 50 cm
depth, when soil is dry) and wedge-shaped peds as alternative
evidence; this implementation requires clay + slickensides. The
"after mixing of upper 18 cm" clause from WRB is still deferred.
}
\references{
IUSS Working Group WRB (2022), Chapter 3.2 -- Vertic
  properties.
}
