Nitrogen Immobilization Loss Calculation — calc_N_immobilization

Calculates the amount of nitrogen immobilized by soil microorganisms based on soil fertility, oxygen availability, and drainage.

Usage

calc_N_immobilization_loss(
  B = 50,
  oxygen_availability = "Normal",
  id_rag = 1,
  greenhouse = FALSE,
  E_residual = 0
)

Arguments

B: Soil fertility factor (B) representing the potential nitrogen mineralization.
oxygen_availability: Oxygen availability level in the soil (e.g., "Normal", "Reduced", "Poor").
id_rag: Soil drainage index (ID_Rag), ranging from 1 (well-drained) to 5 (poorly drained).
greenhouse: Logical. If TRUE, adds 2 kg/ha of nitrogen immobilization as per DPI 2026 foglio C&D (cella D23 "In serra = 2"). Default FALSE.
E_residual: Optional numeric. When the previous crop has negative residual N (e.g. maize stalks buried, sorghum) the DPI 2026 sums -E into D (see foglio C&D, cella I21 "E da conteggiare"). If provided and negative, -E_residual is added to D. Default 0 (no adjustment; E is handled separately in calculate_N_fertilization).

Value

The estimated nitrogen immobilization loss (D) in kg/ha.

Details

This function uses lookup tables (ca.table and cb.table) from the NFert package to determine the immobilization correction factor (fc_D) based on soil drainage and oxygen availability. The nitrogen immobilization loss is then calculated as:

D = B * fc_D + 2 * (greenhouse) + max(0, -E_residual)

Examples

calc_N_immobilization_loss(B = 50, oxygen_availability = "Normal", id_rag = 3)
#> [1] 15
# greenhouse:
calc_N_immobilization_loss(B = 50, oxygen_availability = "Normal",
                           id_rag = 3, greenhouse = TRUE)
#> [1] 17