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Vitrandic Subgroup helper (USDA, KST 13ed)

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

Pass when, throughout one or more horizons with total thickness >= 18 cm within 75 cm of the surface, BOTH:

  • More than 35% (volume) particles >= 2 mm of which > 66% are cinders/pumice; OR fine-earth has >= 30% particles 0.02-2 mm AND >= 5% volcanic glass (in 0.02-2 mm); AND

  • (Al + 0.5 * Fe) * 60 + volcanic_glass_pct >= 30.

KST 13ed, Ch 9 various.

Usage

vitrandic_subgroup_usda(pedon)

Arguments

pedon

A PedonRecord.

Value

A DiagnosticResult.

Details

Implementation simplified to the volcanic-glass branch: volcanic_glass_pct >= 5 AND (Al + 0.5 * Fe) * 60 + volcanic_glass_pct >= 30.