Abrupt textural difference (WRB 2022 Ch 3.2.1)

Sharp clay-content increase between two superimposed mineral layers meeting all of:

• underlying clay \>= 15% AND thickness \>= 7.5 cm;

• underlying starts \>= 10 cm below mineral soil surface;

• underlying has, vs overlying: 2x clay if overlying < 20%, OR \>= 20pp (absolute) more clay if overlying \>= 20%;

• transitional layer, if any, \<= 2 cm.

v0.3.3 enforces criteria 1, 2, 3. The transitional-layer check is deferred (the canonical horizon schema does not carry a "transitional" marker; it can be added later via boundary_distinctness inspection).

Usage

abrupt_textural_difference(pedon)

Arguments

pedon

A PedonRecord.