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v0.2 scaffold delegating to WRB argic. The two diagnostics' clay-increase rules are essentially the same; USDA argillic additionally requires evidence of clay illuviation (clay films / clay bridges) on at least 1% of the surface area, which v0.8 will enforce against the clay_films_amount column.

Usage

argillic_usda(pedon, ...)

Arguments

pedon

A PedonRecord.

...

Passed to argic.

Value

A DiagnosticResult.

References

Soil Survey Staff (2014), Keys to Soil Taxonomy, Ch. 3 – argillic horizon.