Build the canonical Solonchak fixture

Synthetic Solonchak from a coastal-arid setting: surface salt accumulation gives the diagnostic salic horizon (EC 25 dS/m over 25 cm); EC declines but stays elevated in the Bz; non-saline C below. By construction:

• salic: PASSES on Az.

• gypsic, calcic: FAIL.

• argic, ferralic, mollic: FAIL.

Usage

make_solonchak_canonical()

Value

A PedonRecord.