Comprehensive Nutrient Use Efficiency (NUE) — nutrient_use

Computes all major nutrient use efficiency metrics for a given nutrient in a single call.

nutrient_use_efficiency(
  yield_treated,
  yield_control,
  nutrient_applied,
  uptake_treated,
  uptake_control,
  nutrient_name = "N",
  verbose = TRUE
)

Arguments

yield_treated: Numeric. Yield with nutrient applied (kg/ha).
yield_control: Numeric. Yield without nutrient (kg/ha).
nutrient_applied: Numeric. Nutrient applied (kg/ha).
uptake_treated: Numeric. Total nutrient uptake with fertilizer (kg/ha).
uptake_control: Numeric. Total nutrient uptake without fertilizer (kg/ha).
nutrient_name: Character. Name of the nutrient for labeling (e.g., "N", "P", "K"). Default "N".
verbose: Logical. If TRUE, prints informational messages. Default TRUE.

Value

A data frame with one row and seven columns:

nutrient: Character. Nutrient name
agronomic_eff: Numeric. Agronomic efficiency (kg/kg)
physiological_eff: Numeric. Physiological efficiency (kg/kg)
recovery_eff: Numeric. Recovery efficiency (proportion)
partial_factor_prod: Numeric. Partial factor productivity (kg/kg)
internal_util_eff: Numeric. Internal utilization efficiency (kg/kg)
nutrient_harvest_idx: Numeric. Estimated nutrient harvest index (proportion, based on 0.75 grain-to-total ratio assumption)

Details

Formula: $$NUE = \frac{Yield}{Nutrient Applied}$$

References

Dobermann, A. (2007). Nutrient use efficiency: measurement and management. In Fertilizer Best Management Practices, IFA, Paris, pp. 1-28. https://digitalcommons.unl.edu/agronomyfacpub/316/

Congreves, K.A. et al. (2021). Nitrogen use efficiency definitions of today and tomorrow. Frontiers in Plant Science, 12, 637108. doi:10.3389/fpls.2021.637108

Examples

nutrient_use_efficiency(
  yield_treated = 4500, yield_control = 3000,
  nutrient_applied = 120, uptake_treated = 100,
  uptake_control = 60, nutrient_name = "N"
)
#> Complete NUE report for N.
#>   nutrient agronomic_eff physiological_eff recovery_eff partial_factor_prod
#> 1        N          12.5              37.5       0.3333                37.5
#>   internal_util_eff nutrient_harvest_idx
#> 1                45                 0.75