% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/diagnostics-oxisols-usda.R
\name{petroferric_contact_usda}
\alias{petroferric_contact_usda}
\title{Petroferric contact helper (USDA, KST 13ed Ch 3, p 48)}
\usage{
petroferric_contact_usda(pedon, max_top_cm = 125)
}
\arguments{
\item{pedon}{A \code{\link{PedonRecord}}.}

\item{max_top_cm}{Default 125.}
}
\value{
A \code{\link{DiagnosticResult}}.
}
\description{
Ironstone-like layer with >50\% Fe oxides, indurated. v0.8 proxy:
\code{cementation_class} in \{strongly, indurated\} AND
\code{plinthite_pct >= 50} (Fe-rich) AND \code{coarse_fragments_pct >= 50}.
}
