Estimate crop below-ground (root) biomass.

Estimates root dry matter from above-ground biomass using an ensemble of an IPCC root:shoot ratio and a reference below-ground biomass per hectare. The nitrogen-input and irrigation adjustments activate only when their driver columns are present in x.

Usage

calculate_crop_roots(
  x,
  method = c("ensemble", "root_shoot", "reference"),
  weights = list(w_ref = 0.5)
)

Arguments

x

A tibble with item_prod_code, product_dm_t, residue_dm_t and area_ha. Optional n_input_kg_ha enables the nitrogen adjustment; optional water_regime enables the irrigation adjustment.

method

Root method: "ensemble" (default, weighted root:shoot + reference), "root_shoot" (root:shoot ratio only) or "reference" (reference below-ground biomass only).

weights

Named list; w_ref is the reference weight in the ensemble (0-1, default 0.5), used only when method = "ensemble".

Value

The input tibble with root_dm_t and method_root.

Examples

calculate_crop_roots(
  tibble::tibble(
    item_prod_code = "15",
    product_dm_t = 87.9,
    residue_dm_t = 135.75,
    area_ha = 40
  )
)
#> # A tibble: 1 × 6
#>   item_prod_code product_dm_t residue_dm_t area_ha root_dm_t method_root
#>   <chr>                 <dbl>        <dbl>   <dbl>     <dbl> <chr>      
#> 1 15                     87.9         136.      40      66.3 ensemble