% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/diagnostics-properties-wrb.R
\name{anthric_horizons}
\alias{anthric_horizons}
\title{Anthric horizons (WRB 2022)}
\usage{
anthric_horizons(
  pedon,
  min_thickness_cm = 20,
  min_p_mg_kg = 50,
  max_munsell_value = 4
)
}
\arguments{
\item{pedon}{A \code{\link{PedonRecord}}.}

\item{min_thickness_cm}{Minimum thickness for the property-based
path (default 20).}

\item{min_p_mg_kg}{Minimum plant-available P (Mehlich 3, mg/kg)
for the property-based path (default 50).}

\item{max_munsell_value}{Maximum Munsell value moist for the
property-based path (default 4).}
}
\value{
A \code{\link{DiagnosticResult}}.
}
\description{
Tests for any of five anthropogenic surface horizons recognised by
WRB 2022 (hortic, irragric, plaggic, pretic, terric). Diagnostic
of Anthrosols. Two alternative paths qualify:
\enumerate{
  \item \strong{Designation}: any layer's designation contains one
        of \code{hortic|irragric|plaggic|pretic|terric}.
  \item \strong{Property-based}: a surface layer (top_cm <= 5)
        at least \code{min_thickness_cm} cm thick (default 20)
        with elevated dark colour (Munsell value moist <=
        \code{max_munsell_value}, default 4) AND elevated
        plant-available P (\code{p_mehlich3_mg_kg} >=
        \code{min_p_mg_kg}, default 50).
}
Either path qualifies.
}
\references{
IUSS Working Group WRB (2022), Chapter 5, Anthrosols.
}
