Sphagnic Subgroup helper (Histels Fibristels)

Pass when 75 percent or more of the fibric soil materials are derived from Sphagnum to a depth of 50 cm or to a contact, whichever is shallower (KST 13ed, p 190).

Usage

sphagnic_usda(pedon, max_top_cm = 50, min_sphagnum_pct = 75)

Arguments

pedon

A PedonRecord.

max_top_cm

Default 50.

min_sphagnum_pct

Default 75.

Value

A DiagnosticResult.

Details

Implementation uses fiber_content_rubbed_pct >= 75 as a proxy. A more specific Sphagnum-fraction column is deferred.

References

Soil Survey Staff (2022), KST 13ed, Ch. 9, p 190.