Vertic Subgroup helper (USDA, KST 13ed)

Pass when EITHER:

• Cracks within 125 cm of the mineral soil surface that are >= 5 mm wide through a thickness >= 30 cm AND slickensides or wedge-shaped peds in a layer >= 15 cm thick within 125 cm; OR

• Linear extensibility (LE) >= 6.0 cm between surface and 100 cm (or to a densic/lithic/paralithic contact).

Usage

vertic_subgroup_usda(pedon)

Arguments

pedon

A PedonRecord.

Value

A DiagnosticResult.

Details

Implementation: tests cracks_width_cm >= 0.5 AND cracks_depth_cm >= 30 AND slickensides present, OR sum(thickness * cole_value) >= 6 cm.