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Coello (2025) crop-specific synthetic nitrogen application rates

Source: R/datasets.R
coello_synthetic_n.Rd

Corrected average synthetic-nitrogen application rates (kg N ha\(^{-1}\)) by calendar year, FAOSTAT area and CBS crop item, derived from Coello et al. (2025). Coello's 13 crop groups are crosswalked to FAOSTAT CBS items via inst/extdata/coello_mapping.csv and items_prod_full; native years 1961-2019 are carried forward to 2023 with fill_linear. Used by the package synthetic-fertiliser path (method = "coello") to differentiate the FAOSTAT national synthetic-N total across crops while conserving that national total. Rates are the source values clamped to non-negative; implausible outliers above 1000 kg N/ha (Coello model-extrapolation artifacts in a few small areas) are treated as missing, so those crop-area-years follow the missing-rate fallback (temporal fill where available, else the area-share weight) rather than skewing the split. The downstream rate-weighted share normalises within each country-year, so the national total is conserved regardless.

Usage

coello_synthetic_n

Format

A tibble with one row per year-area-crop:

  • year: Integer calendar year (1961-2023).

  • area_code: Integer FAOSTAT area code.

  • item_cbs_code: Integer CBS crop item code.

  • kg_n_ha: Synthetic-N application rate (kg N ha\(^{-1}\)).

Source

Coello, D. et al. (2025) A global gridded crop-specific fertilization dataset from 1961 to 2019. Scientific Data 12:40. doi:10.1038/s41597-024-04215-x

Examples

head(coello_synthetic_n)
#> # A tibble: 6 × 4
#>    year area_code item_cbs_code kg_n_ha
#>   <int>     <int>         <int>   <dbl>
#> 1  1992         1           677    37.0
#> 2  1993         1           677    46.1
#> 3  1994         1           677    32.9
#> 4  1995         1           677    28.9
#> 5  1996         1           677    27.2
#> 6  1997         1           677    32.3