Ochric epipedon (USDA Soil Taxonomy, 13th edition) — ochric_epipedon

The catch-all surface epipedon: any A horizon (or surface horizon with pedogenic alteration) that does NOT meet the specific requirements of histic, folistic, melanic, mollic, umbric, anthropic or plaggen.

Usage

ochric_epipedon_usda(pedon)

Arguments

pedon: A PedonRecord.

Value

A DiagnosticResult.

Details

KST 13ed (Ch 3, p 17): "The ochric epipedon fails to meet the definitions for any of the other seven epipedons because it is too thin or too dry, has too high a color value or chroma, contains too little organic carbon, has too high an n value, has too high a fluidity class or melanic index, or is both massive and hard or harder when dry."

Implementation: pass when none of the 6 implemented epipedons (histic, folistic, melanic, mollic, umbric – v0.8 implements 5; anthropic / plaggen are deferred to v0.9 but rare) pass AND the profile has at least one surface A horizon.

References

Soil Survey Staff (2022), KST 13ed, Ch. 3, p 17.