A weakly developed vertic horizon – the swelling/shrinking machinery is present but does not reach the full vertic intensity (cracks too narrow, or slickensides only "few", or thickness too small). Used by the Protovertic qualifier; relevant for soils that would be Vertisols if the cracks/slickensides were a notch stronger.
Arguments
- pedon
A
PedonRecord.- min_clay
Numeric threshold or option (see Details).
- min_thickness
Numeric threshold or option (see Details).
Details
v0.3.5 detection: clay \>= 30% AND any positive vertic evidence
(slickensides at \>= "few" OR cracks_width_cm \>= 0.2 OR a
wedge/lenticular structure_type) AND thickness \>= 15 cm. The
positive cases that pass the strict vertic_horizon
test are explicitly excluded so the two diagnostics partition the
vertic-spectrum cleanly.