% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/diagnostics-horizons-wrb.R
\name{calcic}
\alias{calcic}
\title{Calcic horizon (WRB 2022)}
\usage{
calcic(pedon, min_thickness = 15, min_caco3_pct = 15)
}
\arguments{
\item{pedon}{A \code{\link{PedonRecord}}.}

\item{min_thickness}{Minimum thickness in cm (default 15).}

\item{min_caco3_pct}{Minimum CaCO3 percent in fine earth (default 15).}
}
\value{
A \code{\link{DiagnosticResult}}.
}
\description{
Tests whether any horizon meets the calcic horizon criteria. The
calcic horizon is a horizon of secondary carbonate accumulation,
diagnostic for Calcisols and qualifying many other RSGs.
}
\details{
Sub-tests called:
\itemize{
  \item \code{\link{test_caco3_concentration}} -- CaCO3 >= 15\%.
  \item \code{\link{test_minimum_thickness}} -- thickness >= 15 cm.
}

v0.2 limitations: the WRB criterion of "5\% absolute or relative more
CaCO3 than the underlying horizon" is not enforced; this captures
true calcic horizons but may also mark uniformly carbonate-rich
substrates that are not pedologically calcic. Cementation
(petrocalcic) is not yet detected. Both refinements are scheduled
for v0.3.
}
\references{
IUSS Working Group WRB (2022). \emph{World Reference Base
for Soil Resources}, 4th edition. International Union of Soil Sciences,
Vienna. Chapter 3 -- Calcic horizon.
}
