GHG Emission Estimation from Field Operations

Quick estimation of greenhouse gas emissions (N2O, CH4, CO2) from agricultural field operations using IPCC Tier 1 default factors.

ghg_emission(
  n_applied,
  residue_burned = FALSE,
  residue_amount = 0,
  paddy_days = 0,
  tillage = "conventional",
  gwp_n2o = 273,
  gwp_ch4 = 27,
  verbose = TRUE
)

Arguments

n_applied

Numeric. N fertilizer applied (kg/ha).

residue_burned

Logical. Whether crop residues are burned. Default FALSE.

residue_amount

Numeric. Residue amount (kg/ha) if burned. Default 0.

paddy_days

Numeric. Days under flooded paddy conditions. Default 0.

tillage

Character. Tillage type: "conventional", "reduced", or "zero". Default "conventional".

gwp_n2o

Numeric. GWP for N2O. Default 273 (IPCC AR6).

gwp_ch4

Numeric. GWP for CH4. Default 27 (IPCC AR6).

verbose

Logical. If TRUE, prints informational messages. Default TRUE.

Value

A data frame with four columns:

source

Character. Emission source description

gas

Character. Greenhouse gas type

emission_kg

Numeric. Raw emission (kg/ha)

CO2_eq_kg

Numeric. Emission in CO2 equivalents (kg CO2-eq/ha)

Details

Formula: $$GHG = \sum (Activity_i \times EF_i)$$ where EF is the emission factor for each activity.

References

IPCC (2019). 2019 Refinement to the 2006 IPCC Guidelines for National Greenhouse Gas Inventories. Volume 4, Chapter 11: N2O emissions from managed soils, and CO2 emissions from lime and urea application. ISBN:978-4-88788-232-4.

Examples

ghg_emission(n_applied = 120, tillage = "zero")
#> GHG emissions estimated (IPCC AR6 GWP).
#>             source gas emission_kg CO2_eq_kg
#> 1         N2O_soil N2O        1.89     514.8
#> 2        CH4_paddy CH4        0.00       0.0
#> 3 CO2_residue_burn CO2        0.00       0.0
#> 4      CO2_tillage CO2       50.00      50.0
ghg_emission(n_applied = 150, paddy_days = 90)
#> GHG emissions estimated (IPCC AR6 GWP).
#>             source gas emission_kg CO2_eq_kg
#> 1         N2O_soil N2O        2.36     643.5
#> 2        CH4_paddy CH4      117.00    3159.0
#> 3 CO2_residue_burn CO2        0.00       0.0
#> 4      CO2_tillage CO2      150.00     150.0