Pisoplinthic horizon (WRB 2022)

WRB 2022 Ch 3.1.28 (p. 60): \>= 40% of the volume (whole soil) yellowish, reddish or blackish concretions or nodules over 2 mm, at least moderately cemented, not part of a petroplinthic horizon, \>= 15 cm thick. Since v0.9.312 the concretions are read from ferric_nodules_pct (Fe/Mn nodules or concretions; the ISIS reader stores the hard ones over 2 mm), adjoining sublayers counting together; a layer where they are not recorded is undecided. Until v0.9.311 the test was plinthite \>= 15% with a "pisolitic" structure, which is not the WRB 2022 definition.

Usage

pisoplinthic(
  pedon,
  min_thickness = 15,
  min_plinthite_pct = 15,
  min_nodules_pct = 40
)

Arguments

pedon

A PedonRecord.

min_thickness

Numeric threshold or option (see Details).

min_plinthite_pct

Not used since v0.9.312; kept so that existing calls still work.

min_nodules_pct

Minimum volume % of concretions and nodules (default 40).

Value

A DiagnosticResult recording whether the diagnostic is present, the qualifying layers, and the supporting evidence.