Tests the texture of the Arenosols (WRB 2022 Ch 4, p. 124): within
100 cm of the mineral soil surface, a weighted average texture of loamy
sand or sand (silt + 2 * clay < 30), layers of finer texture and
layers with \(\ge\) 40% coarse fragments each with a combined
thickness of < 15 cm (v0.9.314; until then every layer had to be coarser
than sandy loam). Diagnostic of Arenosols.
Arguments
- pedon
A
PedonRecord.- max_top_cm
Maximum top depth (cm) of layers to be tested (default 100, per WRB 2022).
- engine
One of
"soilkey"(default; the WRB 2022 test,test_arenosol_texture) or"aqp"(LUCAS-friendly fallback: passes when sand >= 70\ readsgetOption("soilKey.diagnostic_engine").
Details
Sub-test: test_arenosol_texture. A part of the 100 cm whose
texture or coarse fragments are not recorded, or that is not described,
leaves the result undecided (NA) when it could change it.
v0.3 limitations: WRB 2022 Arenosol also requires that no other diagnostic horizon (argic, ferralic, etc.) is present, but those exclusions happen at the key level via canonical RSG order.