% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/diagnostics-rsg-tier2.R
\name{chernozem_strict}
\alias{chernozem_strict}
\title{Chernozem RSG gate (strengthened, WRB 2022 Ch 4, p 111)}
\usage{
chernozem_strict(pedon, min_bs = 50, max_top_cm = 50, strict = NULL)
}
\arguments{
\item{pedon}{A \code{\link{PedonRecord}}.}

\item{min_bs}{Numeric threshold or option (see Details).}

\item{max_top_cm}{Numeric threshold or option (see Details).}

\item{strict}{Logical or \code{NULL}. When \code{NULL} (default) it
resolves via \code{getOption("soilKey.rsg_strict", FALSE)}.
\code{TRUE} raises the base-saturation floor to 80\%.}
}
\value{
A \code{\link{DiagnosticResult}} recording whether the diagnostic is present, the qualifying layers, and the supporting evidence.
}
\description{
WRB-canonical: chernic horizon AND, starting \\<= 50 cm below the
lower limit of the mollic horizon and (if a petrocalcic horizon is
present) above it, a layer with protocalcic properties \\>= 5 cm thick
OR a calcic horizon AND base saturation \\>= 50\% from the surface
to the protocalcic / calcic layer throughout.
}
\details{
v0.3.4 strengthens the previous v0.2 chernozem (which only required
mollic + chernic_color) by adding the protocalcic / calcic gate and
the BS \\>= 50\% requirement.

Note: the v0.2 \code{chernozem()} diagnostic remains available as a
less-strict variant; \code{chernozem_strict()} is what the v0.3.4
key.yaml uses for the CH RSG.
}
\section{Tier-3 strict mode (v0.9.98)}{

With \code{strict = TRUE} the base-saturation floor above the
carbonate-bearing layer is raised from 50\% to 80\%, in line with
the very high base status expected of a textbook Chernozem.
}

