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Estimate ammonia-N volatilisation with MANNER's gross-default technique and incorporation-delay blend.

Source: R/manner_model.R
calculate_manner_nh3_default.Rd

A thin wrapper around calculate_manner_nh3()'s organic-manure path that fills in technique and incorporation_delay_h from manner_default_technique_mix instead of requiring them as caller- supplied drivers. It calls calculate_manner_nh3() once per row of manner_default_technique_mix and combines the results into a single share-weighted emission factor. Use this only where real per-cell/per-era application-technique survey data does not exist (see Details).

Usage

calculate_manner_nh3_default(
  n_applied_t = NULL,
  fertiliser = NULL,
  drivers = list(),
  example = FALSE
)

Arguments

n_applied_t

Numeric, nitrogen applied (t).

fertiliser

One of "cattle_slurry", "pig_slurry", "FYM", "poultry_manure", "urban" (the calculate_manner_nh3() organic-manure path; the gross default only applies there).

drivers

A named list of driver values, as in calculate_manner_nh3()'s organic path, EXCEPT technique and incorporation_delay_h are neither required nor used (they come from manner_default_technique_mix instead).

example

If TRUE, return a small fixture instead of computing from drivers. Defaults to FALSE.

Value

A tibble with n_applied_t, ef (share-weighted realised emission factor), nh3_n_t and method_manner.

Details

manner_default_technique_mix is a deliberate, permanent gross- assumption default, not a region/era-specific survey. It fixes technique = "Broadcast" on every row, matching Spain_Hist's own real production MANNER run, which itself hardcodes Broadcast application nationally with no region/era variation (factor_ap_technique <- application_technique_manure[Technique == "Broadcast", ...] applied unconditionally to its whole national run). For incorporation delay, it blends four of manner_incorporation_factor's delay_bin categories in equal 25% shares: 25% of applied nitrogen assumed never incorporated (incorporation_delay_h = NA, matching how calculate_manner_nh3() treats a missing delay as "No incorporation"), 25% incorporated within 2 hours (incorporation_delay_h = 2), 25% within 12-24 hours (incorporation_delay_h = 24) and 25% within 1-2 days (incorporation_delay_h = 48). Only ef and nh3_n_t are share-weighted across the four blend calls; n_applied_t is carried through as-is, not re-weighted, since the full n_applied_t is assumed split across the four incorporation-delay scenarios rather than quadruplicated.

Examples

calculate_manner_nh3_default(example = TRUE)
#> # A tibble: 1 × 4
#>   n_applied_t    ef nh3_n_t method_manner               
#>         <dbl> <dbl>   <dbl> <chr>                       
#> 1          10 0.219    1.31 manner_default_cattle_slurry