% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/diagnostics-epipedons-usda.R
\name{ochric_epipedon_usda}
\alias{ochric_epipedon_usda}
\title{Ochric epipedon (USDA Soil Taxonomy, 13th edition)}
\usage{
ochric_epipedon_usda(pedon)
}
\arguments{
\item{pedon}{A \code{\link{PedonRecord}}.}
}
\value{
A \code{\link{DiagnosticResult}}.
}
\description{
The catch-all surface epipedon: any A horizon (or surface
horizon with pedogenic alteration) that does NOT meet the
specific requirements of histic, folistic, melanic, mollic,
umbric, anthropic or plaggen.
}
\details{
KST 13ed (Ch 3, p 17): "The ochric epipedon fails to meet the
definitions for any of the other seven epipedons because it is
too thin or too dry, has too high a color value or chroma,
contains too little organic carbon, has too high an n value, has
too high a fluidity class or melanic index, or is both massive and
hard or harder when dry."

Implementation: pass when none of the 6 implemented epipedons
(histic, folistic, melanic, mollic, umbric -- v0.8 implements 5;
anthropic / plaggen are deferred to v0.9 but rare) pass AND the
profile has at least one surface A horizon.
}
\references{
Soil Survey Staff (2022), KST 13ed, Ch. 3, p 17.
}
