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Nitrogen from previous crop residues

Source: R/calc_N_from_crop_residues.R
nitrogen_from_previous_crop_residues.Rd

Estimates the amount of nitrogen (N) available from residues of a previous crop.

Usage

nitrogen_from_previous_crop_residues(
  previous_crop = "Winter cereals straw removal",
  e.table = NFert::e.table
)

Arguments

previous_crop

The name of the previous crop. This must match a value in the previous_crop column of the e.table.

e.table

A data frame containing the nitrogen values (in kg/ha) for different previous crops. It should have at least two columns: previous_crop (character) and N (numeric). The default is NFert::e.table.

Value

The estimated amount of nitrogen (N) in kg/ha available from the previous crop residues.

Details

  • If the value in the e.table is negative, the function returns 0 (as negative N contribution from residues is not meaningful).

  • If there is no matching entry for previous_crop in the e.table, the function returns NA to indicate missing data.

Examples

E <- nitrogen_from_previous_crop_residues(previous_crop = "Winter cereals straw removal")
print(E)
#> [1] -10