Build the canonical Podzol fixture — make_podzol

Synthetic boreal / temperate-coniferous Podzol: bleached E (low clay, low CEC), illuvial Bs with diagnostic Al/Fe oxalate accumulation, weathered C. By construction:

spodic: PASSES on Bs (Al_ox + 0.5*Fe_ox = 0.6, pH 4.5, 40 cm thick).
argic, ferralic, mollic, cambic, plinthic, calcic, gypsic, salic: FAIL.

Usage

make_podzol_canonical()

Value

A PedonRecord.

Details

E horizon Munsell is set to chroma 3 (rather than canonical 1-2 of a true albic) to keep gleyic_properties clearly negative under the conservative v0.2 criterion.