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Phosphorus balance (DPI Emilia-Romagna 2026 metodo del bilancio)

Source: R/P_balance.R
P_balance.Rd

Implements the P2O5 balance of Fert_Office v1.26 foglio Bilancio.

Usage

P_balance(
  expected_yield_tons_ha,
  crop,
  olsen_value,
  olsen_unit = c("P", "P2O5"),
  soil_group = NULL,
  clay = NULL,
  sand = NULL,
  advance_P2O5 = 0,
  depth_cm = 30
)

Arguments

expected_yield_tons_ha

Expected yield (t/ha).

crop

Crop name (matches uptake_table$crop).

olsen_value

Analytical Olsen P (or P2O5) in ppm.

olsen_unit

"P" or "P2O5", default "P".

soil_group

DPI texture group; if NULL and clay/sand given, derived via calc_soil_group_and_id_rag() and mapped to Italian Ragg.

clay, sand

Soil clay/sand percentages (%).

advance_P2O5

Advance anni futuri (default 0 kg/ha).

depth_cm

Soil depth for enrichment calculation (default 30 cm).

Value

A data frame with A, B1, A2, B2, strategy, ID_Gri_P, P2O5_required.

Details

Formula:


  P2O5 da apportare = A (asportazione) + B1 (arricchimento) + A2 (advance_allowed)
                       - B2 (riduzione)

with A set to 0 in "Riduzione" strategy and B2 used only as placeholder.

Examples

P_balance(expected_yield_tons_ha = 6,
          crop = "Grano duro (pianta intera)",
          olsen_value = 15, olsen_unit = "P2O5",
          clay = 18.5, sand = 15.5)
#>      A A_fabbisogno     B1 A2 B2      strategy ID_Gri_P soil_weight_t_ha
#> 1 63.6         63.6 49.296  0  0 Arricchimento        2             3900
#>   P2O5_required
#> 1       112.896