Compute Net Biomass Water Productivity (NBWP) — wapor_calc

Net Biomass Water Productivity (NBWP) = Biomass (kg/ha) / (Transpiration (mm) * 10). Measures the biomass produced per unit of water beneficially consumed through crop transpiration alone, isolating beneficial water consumption from non-beneficial evaporation and canopy interception losses.

Usage

wapor_calc_nbwp(
  biomass_value,
  t_mm,
  biomass_unit = "kg/ha",
  provenance = NULL,
  compatibility_mode = c("warn", "strict")
)

Arguments

biomass_value: Numeric or SpatRaster. Seasonal biomass (kg/ha or t/ha).
t_mm: Numeric or SpatRaster. Seasonal Transpiration (mm).
biomass_unit: Character. Unit: "kg/ha" (default) or "t/ha".
provenance: Optional named provenance records for biomass and transpiration.
compatibility_mode: Missing-metadata policy: "warn" or "strict". Known incompatibilities always stop the calculation.

Value

Numeric or SpatRaster. NBWP in kg/m3.

References

Molden, D., Oweis, T., Steduto, P., Bindraban, P., Hanjra, M. A., & Kijne, J. (2010). Improving agricultural water productivity: Between optimism and realism. Agricultural Water Management, 97(4), 528-535.

Examples

wapor_calc_nbwp(12000, 300) # 12000 kg/ha biomass, 300 mm T -> 4.0 kg/m3
#> [1] 4