Tests for >= 10% volume of duripan nodules (Si-cemented) within a
horizon at least 10 cm thick. Diagnostic of Durisols.
Usage
duric_horizon(pedon, min_thickness = 10, min_duripan_pct = 10)
Arguments
- pedon
A PedonRecord.
- min_thickness
Minimum thickness (cm; default 10 per WRB 2022).
- min_duripan_pct
Minimum duripan volume % (default 10 per WRB
2022).
Value
A DiagnosticResult.
v0.3.1: thresholds aligned with WRB 2022 Ch 3.1.7 (10%, 10 cm) –
previous v0.3 used 15%/15 cm. Petroduric (cemented continuous
duripan) detection still deferred and will be added in v0.4.
References
IUSS Working Group WRB (2022), Chapter 3.1.7 – Duric
horizon (p. 41).
