Agronomic efficiency (AE), partial factor productivity (PFP), apparent recovery efficiency (ARE), physiological efficiency (PE), internal utilization efficiency (IE) and, when biomass is given, the biomass-based physiological efficiency and utilization efficiency of Fageria and Baligar (2005). All arguments may be vectors (one value per treatment).
Usage
nue_calculate(
yield_fertilized,
yield_control,
nutrient_applied,
nutrient_uptake_fert = NULL,
nutrient_uptake_ctrl = NULL,
biomass_fert = NULL,
biomass_ctrl = NULL,
verbose = TRUE
)Arguments
- yield_fertilized
Grain yield with the nutrient (kg/ha).
- yield_control
Grain yield of the control without the nutrient (kg/ha).
- nutrient_applied
Nutrient applied (kg/ha), greater than 0.
- nutrient_uptake_fert
Total nutrient uptake with the nutrient (kg/ha), optional.
- nutrient_uptake_ctrl
Total nutrient uptake of the control (kg/ha), optional.
- biomass_fert
Total biomass with the nutrient (kg/ha), optional.
- biomass_ctrl
Total biomass of the control (kg/ha), optional.
- verbose
Logical. If TRUE (default), prints the table.
Details
AE = (Yf - Yc) / N (kg grain per kg nutrient)
PFP = Yf / N
ARE = 100 (Uf - Uc) / N (percent)
PE = (Yf - Yc) / (Uf - Uc) (kg grain per kg nutrient taken up; called agro-physiological efficiency by Fageria and Baligar)
IE = Yf / Uf
PE_biomass = (Bf - Bc) / (Uf - Uc) and UE = PE_biomass x ARE / 100 (Fageria and Baligar, 2005)
AE = PE x ARE / 100 holds by definition. PE is not computed when the uptake difference is zero or negative.
References
Dobermann, A. (2005). Nitrogen use efficiency - state of the art. IFA International Workshop on Enhanced-Efficiency Fertilizers, Frankfurt.
Fageria, N.K. and Baligar, V.C. (2005). Enhancing nitrogen use efficiency in crop plants. Advances in Agronomy, 88, 97-185. doi:10.1016/S0065-2113(05)88004-6
Examples
nue_calculate(yield_fertilized = 1850, yield_control = 1200,
nutrient_applied = 40)
#>
#> ======================================================================
#> NUTRIENT USE EFFICIENCY
#> ======================================================================
#> Yield_Fertilized Yield_Control Nutrient_Applied Yield_Response AE_kg_kg
#> 1850 1200 40 650 16.25
#> PFP_kg_kg
#> 46.25
#>
#> AE, PFP, PE, IE: kg grain per kg nutrient; ARE: percent of applied nutrient recovered
# Several N doses with uptake and biomass
nue_calculate(yield_fertilized = c(1450, 1720, 1850),
yield_control = 1200, nutrient_applied = c(20, 40, 60),
nutrient_uptake_fert = c(48, 61, 68),
nutrient_uptake_ctrl = 35,
biomass_fert = c(4300, 4950, 5300), biomass_ctrl = 3600)
#>
#> ======================================================================
#> NUTRIENT USE EFFICIENCY
#> ======================================================================
#> Yield_Fertilized Yield_Control Nutrient_Applied Yield_Response AE_kg_kg
#> 1450 1200 20 250 12.50
#> 1720 1200 40 520 13.00
#> 1850 1200 60 650 10.83
#> PFP_kg_kg ARE_percent PE_kg_kg IE_kg_kg PE_biomass_kg_kg UE_kg_kg
#> 72.50 65 19.23 30.21 53.85 35.00
#> 43.00 65 20.00 28.20 51.92 33.75
#> 30.83 55 19.70 27.21 51.52 28.33
#> HI_Fertilized HI_Control
#> 33.72 33.33
#> 34.75 33.33
#> 34.91 33.33
#>
#> AE, PFP, PE, IE: kg grain per kg nutrient; ARE: percent of applied nutrient recovered