v0.9.309: the criteria of WRB 2022 Ch 3.1.11 (p. 45). The horizon consists
of mineral material, is >= 15 cm thick and is not part of a petroplinthic,
pisoplinthic or plinthic horizon, and has, in one or more subhorizons,
(a) >= 15% of its area as coarse (> 20 mm) masses inside aggregates that
are black or have a hue redder than 7.5YR and a chroma >= 5, moist, or
(b) >= 5% concretions or nodules, at least weakly cemented, reddish or
blackish, > 2 mm (ferric_nodules_pct). Until v0.9.308 soilKey read
it from Fe-dithionite >= 5%, which is not a criterion of the text: a red
Ferralsol with 6% Fe-dithionite and no nodules became Ferric (ISRIC's
KE009). soilKey records no size for mottles, so criterion (a) is met only
by nodules; mottles of the right colours leave it undecided, and a layer
with no mottles and no nodules recorded as such does not meet it.
Arguments
- pedon
A
PedonRecord.- min_thickness
Minimum thickness (cm; default 15).
- min_nodules_pct
Minimum nodules, % (default 5).