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Vertisol RSG gate (WRB 2022 Ch 4, p 101)

Source: R/diagnostics-rsg-tier2.R
vertisol.Rd

WRB-canonical: vertic horizon \<= 100 cm AND \>= 30% clay between the surface and the vertic horizon throughout AND shrink-swell cracks that start at the surface (or below a plough layer / below a self- mulching surface / below a surface crust) and extend to the vertic horizon.

Usage

vertisol(pedon, strict = NULL)

Arguments

pedon

A PedonRecord.

strict

Logical or NULL. When NULL (default) it resolves via getOption("soilKey.rsg_strict", FALSE). TRUE applies the Tier-3 strengthened threshold.

Value

A DiagnosticResult.

Details

v0.3.4 enforces (1) vertic horizon, (2) all overlying layers \>= 30% clay, and (3) shrink-swell cracks that start within the upper 20 cm. "Cracks extending to the vertic horizon" is enforced indirectly by the test_shrink_swell_cracks test that already requires an explicit cracks_width_cm value.

Tier-3 strict mode (v0.9.98)

With strict = TRUE the overlying-clay threshold is raised from 30% to 35%, tightening the gate against marginally clayey profiles that satisfy the vertic horizon but sit close to the Vertisol cut-off.