Classify a pedon under the Soil Classification System of Japan

Keys a PedonRecord through the Soil Classification System of Japan (Japanese Society of Pedology 2017), following its key to great groups. Experimental: this release keys the ten great groups (Man-made soils, Organic Soils, Andosols, Podzols, Fluvic soils, Red-Yellow soils, Stagnic soils, Eutrosols, Brown Forest soils, Regosols) and their 26 groups (for instance Allophanic and Non-allophanic Andosols, Fluvic Paddy soils, Magnesian Eutrosols, Sandy Regosols), and their 120 subgroups (Haplic, Humic, Cumulic, Aquic ...); the soil phases follow. Each level gives the official English name and, in levels$name_native, the Japanese one.

Usage

classify_scsj2017(
  pedon,
  rules = NULL,
  on_missing = c("warn", "silent", "error"),
  gapfill = FALSE
)

Arguments

pedon: A PedonRecord.
rules: Optional pre-loaded rule set (load_rules("scsj2017")).
on_missing: One of "warn" (default), "silent", "error".
gapfill: Opt-in within-pedon gap-fill, as in classify_usda.

Value

A ClassificationResult with system_id "scsj2017", the deepest class in name, the great group in rsg_or_order, the classes of each level in levels (with name_native), the key trace, provisional_because (classes before the assigned one that could not be decided), and in phases the soil phases of chapter V (temperature, man-made and forest phases; the class name is left as it is).

Details

The SCSJ reads the Japanese horizon notation (H, O, A, E, B, C, G with Go and Gr, R; p ploughed, g gleyed, t, w, s, h, ir, mn; a 2 or II prefix for a lithologic discontinuity, a trailing b for buried; the FAO/USDA notation by the same letters), moist Munsell colours, texture, organic carbon, the phosphate absorption coefficient (phosphate_absorption_coef, mg P2O5/100 g) or its substitutes (P retention, Alo + 1/2 Feo) and the field active-aluminium test (active_al_test), rubbed fibre, pH, base saturation, exchangeable Ca and Mg, Fe(d), Sio, Alp/Alo, the exchange acidity (exchange_acidity_y1), the dipyridyl test (childs_test), fluidity and n_value, mottles and where they are, artefacts, and the recorded origin of the layers (layer_origin, rock_origin: fill, volcanic ejecta, alluvial deposits). From the site it reads land_use or flood_irrigated (paddy land), parent_material, drainage_class, artificially_drained, acid_neutralising_amendment and designation_system. The choices where the text is silent are listed in system.file("rules", "scsj2017", "readings.yaml", package = "soilKey").

References

The Fifth Committee for Soil Classification and Nomenclature (2017). Soil Classification System of Japan. The Japanese Society of Pedology.

Examples

res <- classify_scsj2017(make_scsj2017_example("andosol"), on_missing = "silent")
res$name
#> [1] "Humic Allophanic Andosols"
res$levels
#>          level code                      name                name_native
#> 1 great_groups    C                  Andosols               黒ボク土大群
#> 2       groups   C6       Allophanic Andosols       アロフェン質黒ボク土
#> 3    subgroups C6HU Humic Allophanic Andosols 腐植質アロフェン質黒ボク土