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Ferralic texture: sandy loam or finer (same predicate as argic)

Source: R/utils-diagnostic-tests.R
test_ferralic_texture.Rd

Ferralic texture: sandy loam or finer (same predicate as argic)

Usage

test_ferralic_texture(h, candidate_layers = NULL)

Arguments

h

Numeric threshold or option (see Details).

candidate_layers

Numeric threshold or option (see Details).

v0.9.70 morphological fallback (opt-in)

Many BDsolos / SOTERLAC profiles do not record clay_pct, silt_pct, sand_pct on the deep B horizon – only on the topsoil. The strict texture test then returns NA, and ferralic() cascades to NA, blocking Latossolos detection.

With options(soilKey.ferralic_texture_morphological_fallback = TRUE) test_ferralic_texture() accepts a layer as ferralic-textured when the canonical numeric test is NA and the layer satisfies both:

  1. designation matches Bw|Bo|Boi (deeply weathered B-horizon morphology), and

  2. top_cm > 20 (subsoil, not topsoil).

This is a conservative morphological inference: a Bw / Bo designation in a subsoil context strongly implies tropical deep-weathering, which in turn implies sandy-loam-or-finer texture in 95\ FALSE (canonical WRB behaviour preserved).