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Natural Nitrogen Contribution

Source: R/calc_N_deposition.R
natural_contribution.Rd

Calculates the natural nitrogen (N) contribution from atmospheric deposition based on location and crop category.

Usage

natural_contribution(
  location = "Plain adjacent to urbanized areas",
  ccp = "Autumn-winter crop <150 days",
  g.table = NFert::g.table,
  coef_time = NFert::coef_time
)

Arguments

location

The location or type of area (e.g., "Plain adjacent to urbanized areas"). Must match a value in the location column of the g.table.

ccp

Crop category and planting period (e.g., "Autumn-winter crop <150 days"). Must match a value in the ccp column of the coef_time table.

g.table

A data frame containing annual nitrogen deposition rates for different locations. It should have at least two columns: location (character) and annual_deposition (numeric). Defaults to NFert::g.table.

coef_time

A data frame containing adjustment factors (C_tempo) based on crop category and planting period. It should have at least two columns: ccp (character) and C_tempo (numeric). Defaults to NFert::coef_time.

Value

The estimated natural nitrogen contribution in kg/ha, or NA if input values are not found in the respective tables.

Details

The function calculates the natural nitrogen contribution using the following formula:

G = annual_deposition * C_tempo

where:

  • G is the natural nitrogen contribution (kg/ha)

  • annual_deposition is the annual nitrogen deposition rate for the specified location (kg/ha/year)

  • C_tempo is the adjustment factor based on the ccp

Examples

natural_contribution(
  location = "Plain adjacent to urbanized areas",
  ccp = "Autumn-winter crop <150 days"
)
#> [1] 10