The test of the types of the Russian soil classification (Field Guide
of 2008, chapter 4), read by classify_kidpr2008 through
the type lists of inst/rules/kidpr2008/types/. A type is named by
the formula of its profile ("O-EL-BEL-BT-C"); the profile is matched
against every formula of its division with
match_horizon_sequence, three-valued, on the horizons the
divisions read (identify_horizons): fresh litter left out,
the profile under a deposit of 40 cm or less, the surface horizons by the
thickest-horizon rule, sub-horizons merged, transitions and small
horizons left out, an overlay a feature of its layer.
Arguments
- pedon
A
PedonRecord.- type
The code of a type, as its rule file writes it (
"[CA01]").
Value
A DiagnosticResult: TRUE for the type of the
profile; FALSE for another type of the division (one whose formula
matches as well is an intergrade, named in the evidence); NA when an
undecided layer could change the match. The evidence gives the formula,
the horizons that fill its slots, the optional ones absent, the slots
missing, the horizons not in the formula, the horizons left out of the
match, the surface horizon and the edit distance.
Details
Hugo's decisions of 2026-11-02: the match is closed on the horizons the formulas of the division write (a horizon foreign to the division is ignored), BEL only where it is the diagnostic eluvial horizon (CA07, CA08, CA11, CA20, CA21, CD09; elsewhere a BEL neither blocks a formula nor is required by it); a horizon in parentheses is optional, and so is BEL except where it is diagnostic; the g and q marks are expected, not required; the parent material is not tested; "directly under" passes over transitions and sub-horizons, and over up to 15 cm with no diagnostic horizon between AU and BCA. The types are tried most specific first, agro before natural: the first that matches is the type, and another that matches is an intergrade, in the evidence. A few near-identity readings are written on the types they concern (the BF of CB05, CE06 and CE07 is a BHF of either kind; CJ01 takes BCA or CAT; CH02 takes O, T or H; in CB and CE an EL fills the E of a formula); in CD a BCA, like BEL, closes no formula that does not write it. A tie or a missing thickness at the surface, or a layer the data route reads as no horizon between two horizons of a formula, leaves the type undecided.
The types of trunks A, B and D (v0.9.342): the buried soil [ABC] of the stratozems is tested within 100 cm; the substrate of trunk D names its types and is tested (the marks of the loose rock C=, C.., C~~, C", C^^, and R, Rca, Rcs), its mark from the data where it is not written (an alluvial, ash or aeolian origin, else the texture); in trunk A a peat horizon across the line 50 cm under the top of the peat body is TT below it, and a T of the notation in AA is TO or TE by its botany; the BH of BB01 and BB03 is a BHF of either kind.