Estimate end-of-cycle soil P2O5 content (ppm) — estimate_soil_P_end_of

Given the starting soil P2O5 (ppm), the crop P2O5 asportazione (kg/ha) and the fertilization plan (from plan_distribution), returns the estimated soil P2O5 at the end of the cycle in ppm P2O5 (useful as input for the following year's calculation). Formula from Fert_Office v1.26 foglio Gri_P!C27:


  P2O5_end_ppm = P2O5_start_ppm + (P2O5_applied - P2O5_removed) / (soil_weight_30cm/1000) / P_immobilisation_factor

Usage

estimate_soil_P_end_of_cycle(
  P2O5_start_ppm,
  unit = c("P2O5", "P"),
  P2O5_applied,
  P2O5_removed,
  soil_group,
  depth_cm = 30,
  texture_groups.table = NFert::texture_groups.table,
  p_availability_meta = NFert::p_availability_meta
)

Arguments

P2O5_start_ppm: Initial Olsen P2O5 ppm (or pass P and unit="P").
unit: "P" or "P2O5".
P2O5_applied: kg P2O5/ha applied via fertilisers.
P2O5_removed: kg P2O5/ha removed by crop (asportazione).
soil_group: DPI texture grouping.
depth_cm: Soil depth (default 30 cm).
texture_groups.table, p_availability_meta: Lookups.

Value

Numeric ppm P2O5 at end of cycle.

Examples

estimate_soil_P_end_of_cycle(P2O5_start_ppm = 15, P2O5_applied = 170,
                             P2O5_removed = 64, soil_group = "Medio impasto")
#> [1] 31.98718