Pass when a horizon has fragic soil properties:
rupture_resistance class >= "firm" (firm, very firm, extremely firm); OR
NASIS pediagfeatures has a "Fragipan" entry (v0.9.31: the surveyor's field-identified fragipan – direct evidence, used as a tie-breaker when rupture_resistance is missing from the lab data); AND
thickness >= 15 cm.
KSSL pedons rarely carry rupture_resistance; NASIS pediagfeatures carries 13 500 entries including "Fragipan" tags from surveyors. v0.9.31 adds the NASIS path so fragipan can be detected on KSSL+ NASIS pedons (closing the Fragiudults / Fragiudalfs / Fragiaqualfs confusion documented in the v0.9.25 Great Group analysis).
Arguments
- pedon
A
PedonRecord.- max_top_cm
Default 100.