The USDA oxic horizon is the diagnostic of Oxisols. Its central criteria match the WRB 2022 ferralic horizon closely enough that v0.2 simply delegates: every fixture that classifies as Oxisol via USDA also classifies as Ferralsol via WRB and vice-versa. The fine-grained differences (USDA's water-dispersible-clay test, the sand-fraction weatherable-mineral cut-offs) are tracked in the diagnostics.yaml for v0.8 refinement.
Arguments
- pedon
A
PedonRecord.- ...
Passed to
ferralic.
Value
A DiagnosticResult (with name = "oxic_usda").