Estimate symbiotic biological nitrogen fixation by crop legumes.

Estimates symbiotic BNF from leguminous crops via two methods (an NPP-based estimate and the Anglade product-based estimate). Environmental modifiers (nitrogen inhibition, temperature, water) are applied only when their driver columns are present in x; an absent driver leaves that modifier at 1.

Usage

calculate_crop_bnf(x, symbiotic_params = list())

Arguments

x

A tibble with item_prod_code, crop_npp_n_t and product_n_t. Optional driver columns activate the modifiers: n_synth_kg_ha / n_org_kg_ha (nitrogen inhibition), temp_c (temperature), water_input_mm (or precip_mm + irrig_mm) and pet_mm (water).

symbiotic_params

Named list overriding the symbiotic-BNF parameters k_n_synth, k_n_org, t_opt, t_sigma, ai_threshold.

Value

The input tibble with the environmental factors, ndfa_adj, crop_bnf_t (NPP method), crop_bnf_anglade_t (Anglade method) and the per-product ratios bnf_product_ratio_npp / bnf_product_ratio_anglade.

Examples

calculate_crop_bnf(
  tibble::tibble(item_prod_code = "176", crop_npp_n_t = 10, product_n_t = 5)
)
#> # A tibble: 1 × 27
#>   item_prod_code crop_npp_n_t product_n_t n_synth_kg_ha n_org_kg_ha temp_c
#>   <chr>                 <dbl>       <dbl>         <dbl>       <dbl>  <dbl>
#> 1 176                      10           5             0           0     NA
#> # ℹ 21 more variables: pet_mm <dbl>, som_pct <dbl>, soil_ph <dbl>,
#> #   clay_pct <dbl>, water_input_mm <dbl>, name_bnf <chr>, ndfa <dbl>,
#> #   n_harvest_index <dbl>, below_ground_n_ratio <dbl>,
#> #   nonsymbiotic_base_kg_ha <int>, leguminous_share <dbl>, n_total_kg_ha <dbl>,
#> #   f_nitrogen_symbiotic <dbl>, f_temperature_symbiotic <dbl>,
#> #   f_water_symbiotic <dbl>, f_env_symbiotic <dbl>, ndfa_adj <dbl>,
#> #   crop_bnf_t <dbl>, crop_bnf_anglade_t <dbl>, bnf_product_ratio_npp <dbl>, …