Skip to contents

Andic soil properties (USDA, KST 13ed Ch 3, p 32)

Source: R/diagnostics-andisols-usda.R
andic_soil_properties_usda.Rd

Soil materials with one or both of the following:

  • bulk_density <= 0.90 g/cm3 AND Al + 0.5*Fe (oxalate) >= 2.0% AND phosphate_retention >= 85%; OR

  • Al + 0.5*Fe (oxalate) >= 0.4% AND phosphate_retention >= 25% AND volcanic_glass_pct varying with the texture-class proxy (deferred – requires fine-earth fraction analysis).

Usage

andic_soil_properties_usda(pedon)

Arguments

pedon

A PedonRecord.

Value

A DiagnosticResult.

Details

Implementation (v0.8.6): primary "humic-andic" branch (bd <= 0.9 + Al+0.5Fe >= 2 + Pret >= 85). The vitric-andic branch (lower Al+Fe but high glass content) is partially captured.

References

Soil Survey Staff (2022), KST 13ed, Ch. 3, p 32.