Leaching Loss of Nitrogen — leaching

Calculates the nitrogen leaching loss from soil based on two methods:

Usage

leaching_loss(
  winter_rain = 160,
  start_spring_rain = 40,
  oxygen_availability = "Normal",
  id_rag = 3,
  b1 = 29.16
)

Arguments

winter_rain: Winter rainfall (October 1 to January 31) in mm.
start_spring_rain: Rainfall in February in mm.
oxygen_availability: Oxygen availability level in the soil (e.g., "Normal").
id_rag: Soil drainage index (ID_Rag).
b1: Readily available nitrogen in the soil (kg/ha).

Value

A list containing: - C1: Nitrogen leaching loss in the autumn-winter season (kg/ha). - C2: Nitrogen leaching loss after leaving winter (kg/ha). - surplus_pluviometrico: Logical. TRUE when winter_rain + start_spring_rain >= 300 mm (DPI 2026 scheda a dose standard: attiva l'incremento "Lisciviazione x surplus pluviometrico").

Details

Precipitation-Based Method (C1):
- Considers winter rainfall (October 1 to January 31).
- No loss if rainfall < 150 mm.
- Progressive loss of readily available nitrogen (b1) if rainfall is 150-250 mm.
- Complete loss of readily available nitrogen if rainfall > 250 mm.
Ease of Drainage Method (C2):
- Estimates leaching based on soil drainage capacity (ID_Rag) and oxygen availability.
- Uses lookup tables (ca.table and cb.table) for specific values.

Examples

leaching_loss(winter_rain = 160, start_spring_rain = 40,
              oxygen_availability = "Normal", id_rag = 3, b1 = 29.16)
#> $C1
#> [1] 20
#> 
#> $C2
#> [1] 2.916
#> 
#> $surplus_pluviometrico
#> [1] FALSE
#>