calc_emissions_inputs: Calculate indirect emissions from purchased inputs

In cowfootR: Dairy Farm Carbon Footprint Assessment

Calculate indirect emissions from purchased inputs

Description

Estimates CO2e emissions from purchased inputs such as feeds, fertilizers, and plastics using regional factors, with optional uncertainty analysis.

Usage

calc_emissions_inputs(
  conc_kg = 0,
  fert_n_kg = 0,
  plastic_kg = 0,
  feed_grain_dry_kg = 0,
  feed_grain_wet_kg = 0,
  feed_ration_kg = 0,
  feed_byproducts_kg = 0,
  feed_proteins_kg = 0,
  feed_corn_kg = 0,
  feed_soy_kg = 0,
  feed_wheat_kg = 0,
  region = "global",
  fert_type = "mixed",
  plastic_type = "mixed",
  include_uncertainty = FALSE,
  transport_km = NULL,
  ef_conc = NULL,
  ef_fert = NULL,
  ef_plastic = NULL,
  boundaries = NULL
)

Arguments

conc_kg	Numeric. Purchased concentrate feed (kg/year). Default = 0.
fert_n_kg	Numeric. Purchased nitrogen fertilizer (kg N/year). Default = 0.
plastic_kg	Numeric. Agricultural plastics used (kg/year). Default = 0.
feed_grain_dry_kg	Numeric. Grain dry (kg/year, DM). Default = 0.
feed_grain_wet_kg	Numeric. Grain wet (kg/year, DM). Default = 0.
feed_ration_kg	Numeric. Ration (total mixed ration) (kg/year, DM). Default = 0.
feed_byproducts_kg	Numeric. Byproducts (kg/year, DM). Default = 0.
feed_proteins_kg	Numeric. Protein feeds (kg/year, DM). Default = 0.
feed_corn_kg	Numeric. Corn (kg/year, DM). Default = 0.
feed_soy_kg	Numeric. Soybean meal (kg/year, DM). Default = 0.
feed_wheat_kg	Numeric. Wheat (kg/year, DM). Default = 0.
region	Character. "EU","US","Brazil","Argentina","Australia","global". Default "global".
fert_type	Character. "urea","ammonium_nitrate","mixed","organic". Default "mixed".
plastic_type	Character. "LDPE","HDPE","PP","mixed". Default "mixed".
include_uncertainty	Logical. Include uncertainty ranges? Default FALSE.
transport_km	Numeric. Average feed transport distance (km). Optional.
ef_conc, ef_fert, ef_plastic	Numeric overrides for emission factors (kg CO2e per unit).
boundaries	Optional. Object from set_system_boundaries().

Details

Notes:

• When system boundaries exclude "inputs", this function MUST return a list with source = "inputs" and a numeric co2eq_kg = 0 to satisfy partial-boundaries integration.

• The primary total field is co2eq_kg (for compatibility with calc_total_emissions()); total_co2eq_kg is included as a duplicate for convenience.

Value

A list with fields:

• source = "inputs"

• emissions_breakdown (named values per input)

• co2eq_kg (numeric total)

• total_co2eq_kg (duplicate of co2eq_kg)

• emission_factors_used, inputs_summary, contribution_analysis, uncertainty (if requested)

• metadata (methodology, standards, date)

Examples

# Quick example (runs fast)
calc_emissions_inputs(conc_kg = 1000, fert_n_kg = 200, region = "EU")

# With uncertainty analysis
calc_emissions_inputs(feed_corn_kg = 2000, region = "US", include_uncertainty = TRUE)

cowfootR documentation built on Jan. 13, 2026, 5:07 p.m.