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Spodic Subgroup helper for Psammorthels/Psammoturbels

Source: R/diagnostics-gelisols-usda.R
spodic_subgroup_usda.Rd

Pass when a horizon >= 5 cm thick has any of:

  • In >= 25% of pedon, extremely weakly coherent or more coherent due to pedogenic cementation by OM and Al (with or without Fe); OR

  • Al + 0.5 * Fe (oxalate) >= 0.25, and half that or less in an overlying horizon; OR

  • ODOE >= 0.12, and value half as high or lower in an overlying horizon.

Usage

spodic_subgroup_usda(pedon)

Arguments

pedon

A PedonRecord.

Value

A DiagnosticResult.

Details

Implementation simplified to: any horizon with (al_ox_pct + 0.5 * fe_ox_pct) >= 0.25 with an overlying layer having <= half that value.