| Type: | Package |
| Title: | Nitrogen Use Efficiency Toolkit on Numerics |
| Version: | 0.1.0 |
| Maintainer: | Shubham Love <shubhamlove2101@gmail.com> |
| Description: | Comprehensive R package designed to facilitate the calculation of Nitrogen Use Efficiency (NUE) indicators using experimentally derived data. The package incorporates 23 parameters categorized into six fertilizer-based, four plant-based, three soil-based, three isotope-based, two ecology-based, and four system-based indicators, providing a versatile platform for NUE assessment. As of the current version, 'NUETON' serves as a starting point for users to compute NUE indicators from their experimental data. Future updates are planned to enhance the package's capabilities, including robust data visualization tools and error margin consideration in calculations. Additionally, statistical methods will be integrated to ensure the accuracy and reliability of the calculated indicators. All formulae used in 'NUETON' are thoroughly referenced within the source code, and the package is released as open source software. Users are encouraged to provide feedback and contribute to the improvement of this package. It is important to note that the current version of 'NUETON' is not intended for rigorous research purposes, and users are responsible for validating their results. The package developers do not assume liability for any inaccuracies in calculations. This package includes content from Congreves KA, Otchere O, Ferland D, Farzadfar S, Williams S and Arcand MM (2021) 'Nitrogen Use Efficiency Definitions of Today and Tomorrow.' Front. Plant Sci. 12:637108. <doi:10.3389/fpls.2021.637108>. The article is available under the Creative Commons Attribution License (CC BY) C. 2021 Congreves, Otchere, Ferland, Farzadfar, Williams and Arcand. |
| License: | GPL-3 |
| Encoding: | UTF-8 |
| RoxygenNote: | 7.2.3 |
| Config/testthat/edition: | 3 |
| NeedsCompilation: | no |
| Packaged: | 2023-11-12 17:31:49 UTC; itssh |
| Author: | Shubham Love [aut, cre] |
| Repository: | CRAN |
| Date/Publication: | 2023-11-13 17:53:24 UTC |
Calculate Agronomic Efficiency
Description
The contribution of fertilizer N towards yield, compared to a non-fertilized control Calculate AE using the formula: AE = (YieldF-Yield0)/FertN
Usage
AE(YieldF = NULL, Yield0 = NULL, FertN = NULL, PE = NULL, RE = NULL)
Arguments
YieldF |
A numeric vector for yield in fertilized Conditions. |
Yield0 |
A numeric vector of non-fertilized control yield values. |
FertN |
The value of inorganic N contained in any form of N input (from synthetic or organic sources) |
PE |
Physiological Efficiency numeric value |
RE |
Recovery Efficiency numeric value |
Value
The calculated AE value.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: Dobermann, A. (2007). “Nutrient use efficiency–measurement and management,” in Proceedings of the International Fertilizer Industry Association (IFA) Workshop on Fertilizer Best Management Practices, 7–9 March 2007, Brussels, 1–28.
Examples
YieldF <- c(2.92, 3.78, 4.68, 4.21)
Yield0 <- c(1.98, 2.66, 4.26, 3.78)
FertN <- 15
AE(YieldF, Yield0, FertN)
PE<-10
RE<-5
AE(PE=PE, RE=RE)
Calculate Internal Efficiency (IE)
Description
The fraction of plant tissue N that is contained in the yield component. Calculate IE using the formula: IE = YieldNF / PlantNf
Usage
IE(YieldNF, PlantNf)
Arguments
YieldNF |
A numeric vector for yield N in fertilized Conditions. |
PlantNf |
A numeric vector of non-fertilized control yield values. |
Value
The calculated IE value.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: Dobermann, A. (2007). “Nutrient use efficiency–measurement and management,” in Proceedings of the International Fertilizer Industry Association (IFA) Workshop on Fertilizer Best Management Practices, 7–9 March 2007, Brussels, 1–28.
Examples
YieldNF <- c(2.92, 3.78, 4.68, 4.21)
PlantNf <- c(2.89, 3.66, 4.73, 4.16)
IE(YieldNF, PlantNf)
Calculate N Balance Intensity (NBI)
Description
The difference between fertilizer N applied and the N removed as yield; commonly called N surplus.
Calculate NBI using the formula: NBI = YieldN-FertN
Usage
NBI(YieldN, FertN)
Arguments
YieldN |
A numeric vector of the N removed as yield values. |
FertN |
A numeric value for fertilizer N input. |
Value
The calculated NBI value.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: IPNI (2014). Nutrient Performance Indicators: The Importance of Farm Scale Assessments, Linked to Soil Fertility, Productivity, Environmental Impact and the Adoption of Grower Best Management Practices. Available online at: http://anz.ipni.net/ipniweb/region/anz.nsf/0/9312A2172A0B917CCA257E8E007219B4/$FILE/IssueReviewPerfInd081114.pdf
Examples
YieldN <- c(5.4, 6.3, 4.8, 7.2)
FertN <- 1.5
NBI(YieldN, FertN)
Calculate N Harvest Index (NHI)
Description
The percent of plant tissue N that is contained in the yield component. Calculate NHI using the formula: NHI = YieldF / PlantNf
Usage
NHI(YieldF, PlantNf)
Arguments
YieldF |
A numeric vector of final yield values. |
PlantNf |
A numeric value for plant tissue N. |
Value
The calculated NHI value.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: Moll, R. H., Kamprath, E. J., and Jackson, W. A. (1982). Analysis and interpretation of factors which contribute to efficiency of nitrogen utilization 1. Agron. J. 74, 562–564. doi: 10.2134/agronj1982.00021962007400030 037x
Examples
YieldF<- c(2.89, 3.66, 4.73, 4.16)
PlantNf <- c(2.92, 3.78, 4.68, 4.21)
NHI(YieldF, PlantNf)
Calculate Nitrogen Productivity (NP)
Description
The ratio of the relative growth rate to the concentration of N in plant tissues. Calculate Nitrogen Productivity using the formula: NP = GR/PlantN
Usage
NP(GR, PlantN)
Arguments
GR |
Plant relative growth rate value |
PlantN |
A numeric vector of values for plant N concentration. |
Value
The calculated NP value.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: Berendse, F., and Aerts, R. (1987). Nitrogen-use-efficiency: a biologically meaningful definition? Funct. Ecol. 1, 293–296.
Examples
GR <- 15
PlantN <- c(12.1, 8.99, 12.89, 13.11)
NP(GR, PlantN)
Calculate Fertilizer-N Recovery Efficiency
Description
The percentage of fertilizer N that is taken up by the plant, accounting for background soil N levels; also sometimes referred to as apparent recovery. Calculate NRE using the formula: NRE = ((PlantNf - PlantN0) / FertN) * 100
Usage
NRE(PlantNf, PlantN0, FertN)
Arguments
PlantNf |
A numeric vector of values for plant N at the end of the experiment. |
PlantN0 |
A numeric vector of values for plant N at the beginning of the experiment. |
FertN |
A numeric value for fertilizer N input. |
Value
The calculated NRE value as a percentage.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: Dobermann, A. (2007). “Nutrient use efficiency–measurement and management,” in Proceedings of the International Fertilizer Industry Association (IFA) Workshop on Fertilizer Best Management Practices, 7–9 March 2007, Brussels, 1–28.
Examples
PlantNf <- c(2.92, 3.78, 4.68, 4.21)
PlantN0 <- c(1.22, 2.66, 3.99, 2.58)
FertN <- 15
NRE(PlantNf, PlantN0, FertN)
Calculate Isotope-Based Recovery Efficiency of N-Fertlizer (NRE15)
Description
The percent recovery, or utilization, of fertilizer-N in plant and/or soil components Calculate NRE15 using the formula: NRE15 = (TNdfF in Plant or Soil / FertN) * 100
Usage
NRE15(TNdfF, FertN)
Arguments
TNdfF |
Total N derived from Fertilizer in plant or soil value. |
FertN |
A numeric value for fertilizer N input. |
Value
The calculated NRE15 value as a percentage.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: IAEA (1983). Guide on the Use of Nitrogen-15 and Radioisotopes in Studies of Plant Nutrition: Calculations and Interpretation of Data. Vienna: IAEA.
Examples
TNdfF <- 3.058888
FertN <- 15
NRE15(TNdfF, FertN)
Calculate NUE of a Food Chain (NUEFC)
Description
The N balance of the entire food chain system, in terms of N consumed as protein relative to N inputs. Calculate NUEFC using the formula: NUEFC = Ncon / Ni
Usage
NUEFC(Ncon, Ni)
Arguments
Ncon |
The value of N available for consumption |
Ni |
Sum total of new N input |
Value
The calculated NUEFC value.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: Erisman, J. W., Sutton, M. A., Galloway, J., Klimont, Z., and Winiwarter, W. (2008). How a century of ammonia synthesis changed the world. Nat. Geosci. 1, 636–639. doi: 10.1038/ngeo325
Examples
Ncon <- 15.574
Ni <- c(2.92, 3.78, 4.68, 4.21)
NUEFC(Ncon, Ni)
Calculate NUEbalance
Description
The fraction of N inputs that are removed from the system (either as yield or N losses) Calculate NUEbalance using the formula: NUEbal = No/Ni
Usage
NUEbal(No, Ni)
Arguments
No |
Sum total of N outputs (enter each value individually) |
Ni |
Sum total of N inputs (enter each value individually) |
Value
The calculated NUEbalance value.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: Martinez-Feria, R. A., Castellano, M. J., Dietzel, R. N., Helmers, M. J., Liebman, M., Huber, I., et al. (2018). Linking crop- and soil-based approaches to evaluate system nitrogen-use efficiency and tradeoffs. Agric. Ecosyst. Environ. 256, 131– 143. doi: 10.1016/j.agee.2018.01.002
Examples
No <- c(2.89, 3.66, 4.73, 4.16)
Ni <- c(2.92, 3.78, 4.68, 4.21)
NUEbal(No, Ni)
Calculate NUEcrop
Description
The fraction of fertilizer N that is utilized and allocated to yield N. Calculate NUEcrop using the formula: NUEcrop = YieldN/FertN
Usage
NUEcrop(YieldN, FertN)
Arguments
YieldN |
A numeric vector of the N removed as yield values. |
FertN |
A numeric value for fertilizer N input. |
Value
The calculated NUEcrop value.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: Martinez-Feria, R. A., Castellano, M. J., Dietzel, R. N., Helmers, M. J., Liebman, M., Huber, I., et al. (2018). Linking crop- and soil-based approaches to evaluate system nitrogen-use efficiency and tradeoffs. Agric. Ecosyst. Environ. 256, 131– 143. doi: 10.1016/j.agee.2018.01.002
Examples
YieldN <- c(2.88, 4.54, 3.62, 4.21)
FertN <- 15
NUEcrop(YieldN, FertN)
Calculate NUEsoil
Description
The biomass production per unit of available N. Calculate NUEsoil using the formula: NUEsoil = PlantBM / (FertN + SoilN)
Usage
NUEsoil(PlantBM, SoilN, FertN)
Arguments
PlantBM |
A numeric vector of values for plant biomass. |
SoilN |
A numeric value for soil N content. |
FertN |
A numeric value for fertilizer N input. |
Value
The calculated NUEsoil value.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: Moll, R. H., Kamprath, E. J., and Jackson, W. A. (1982). Analysis and interpretation of factors which contribute to efficiency of nitrogen utilization 1. Agron. J. 74, 562–564. doi: 10.2134/agronj1982.00021962007400030 037x
Examples
PlantBM <- c(12.1, 8.99, 12.89, 13.11)
SoilN <- 20
FertN <- 15
NUEsoil(PlantBM, SoilN, FertN)
Calculate NUEyield
Description
The contribution of N supplied from the soil that is allocated to the yield N; also often referred to as simply NUE. Calculate NUEyield using the formula: NUEyield = NUpE * NUtE
Usage
NUEyield(NUpE, NUtE)
Arguments
NUpE |
N Uptake Efficiency |
NUtE |
N Utilization Efficiency |
Value
The calculated NUEyield value.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: Novoa, R., and Loomis, R. S. (1981). Nitrogen and plant production. Plant Soil 58, 177–204. doi: 10.1007/BF02180053
Examples
NUpE <- 33.63571
NUtE <- 1.009715
NUEyield(NUpE, NUtE)
Calculate N Uptake Efficiency (NUpE)
Description
The percentage of available soil N that is utilized by the plant; also conceptualized as apparent recovery efficiency of the N supply. Calculate NUpE using the formula: NUpE = (PlantN / (FertN + SoilN)) * 100
Usage
NUpE(PlantN, SoilN, FertN)
Arguments
PlantN |
A numeric vector of values for plant N content. |
SoilN |
A numeric value for soil N content. |
FertN |
A numeric value for fertilizer N input. |
Value
The calculated NUpE value.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: Moll, R. H., Kamprath, E. J., and Jackson, W. A. (1982). Analysis and interpretation of factors which contribute to efficiency of nitrogen utilization 1. Agron. J. 74, 562–564. doi: 10.2134/agronj1982.00021962007400030 037x
Examples
PlantN <- c(12.1, 8.99, 12.89, 13.11)
SoilN <- 20
FertN <- 15
NUpE(PlantN, SoilN, FertN)
Calculate N Utilization Efficiency (NUtE)
Description
The contribution of fertilizer N from the plant tissues towards the yield component. Similar to PE, but does not account for background N. Calculate NUtE using the formula: NUtE = Yield / PlantN
Usage
NUtE(Yield, PlantN)
Arguments
Yield |
A numeric vector of yield values. |
PlantN |
A numeric value for plant tissue N. |
Value
The calculated NUtE value.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: Moll, R. H., Kamprath, E. J., and Jackson, W. A. (1982). Analysis and interpretation of factors which contribute to efficiency of nitrogen utilization 1. Agron. J. 74, 562–564. doi: 10.2134/agronj1982.00021962007400030 037x
Examples
Yield <- c(2.92, 3.78, 4.68, 4.21)
PlantN <- c(2.89, 3.66, 4.73, 4.16)
NUtE(Yield, PlantN)
Calculate N derived from Fertilizer (NdfF)
Description
The percentage of plant or soil N that is derived from the fertilizer. Calculate NdfF using the formula: NdfF = Plant15N/Fert15N
Usage
NdfF(Plant15N, Fert15N)
Arguments
Plant15N |
A vector of 15N atom percent excess in plant or soil values. |
Fert15N |
15N atom percent excess of fertilizer N. |
Value
The calculated NdfF value expressed as a percentage.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: IAEA (1983). Guide on the Use of Nitrogen-15 and Radioisotopes in Studies of Plant Nutrition: Calculations and Interpretation of Data. Vienna: IAEA.
Examples
Plant15N <- c(2.92, 3.78, 4.68, 4.21)
Fert15N <- 15
NdfF(Plant15N, Fert15N)
Calculate Physiological Efficiency
Description
The contribution of fertilizer N from the plant tissues towards the yield component. Calculate PE using the formula: PE = (YieldF-Yield0)/(PlantNf-PlantN0)
Usage
PE(YieldF, Yield0, PlantNf, PlantN0)
Arguments
YieldF |
A numeric vector of final yield values. |
Yield0 |
A numeric vector of non-fertilized control yield values. |
PlantNf |
A numeric vector of values for plant N at the end of the experiment. |
PlantN0 |
A numeric vector of values for plant N at the beginning of the experiment. |
Value
The calculated PE value.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: Dobermann, A. (2007). “Nutrient use efficiency–measurement and management,” in Proceedings of the International Fertilizer Industry Association (IFA) Workshop on Fertilizer Best Management Practices, 7–9 March 2007, Brussels, 1–28.
Examples
YieldF <- c(2.92, 3.78, 4.68, 4.21)
Yield0 <- c(1.98, 2.66, 4.26, 3.78)
PlantNf <- c(2.89, 3.66, 4.73, 4.16)
PlantN0 <- c(1.22, 2.66, 3.99, 2.58)
PE(YieldF, Yield0, PlantNf, PlantN0)
Calculate Partial-factor Productivity (PFP)
Description
The expression of yield per unit of fertilizer N applied.
Calculate PFP using the formula: PFP = YieldF / FertN
Usage
PFP(YieldF, FertN)
Arguments
YieldF |
A numeric vector of final yield values. |
FertN |
A numeric value for fertilizer N input. |
Value
The calculated PFP value.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: Dobermann, A. (2007). “Nutrient use efficiency–measurement and management,” in Proceedings of the International Fertilizer Industry Association (IFA) Workshop on Fertilizer Best Management Practices, 7–9 March 2007, Brussels, 1–28.
Examples
YieldF <- c(12.09, 11.99, 15.20, 10.33)
FertN <- 15
PFP(YieldF, FertN)
Calculate Partial N Balance
Description
The expression of plant N content per unit of fertilizer N applied Calculate PNB using the formula: PNB = PlantNf/FertN
Usage
PNB(PlantNf, FertN)
Arguments
PlantNf |
Plant N content in fertilized conditons. |
FertN |
A numeric value for fertilizer N input. |
Value
The calculated PNB value.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: Dobermann, A. (2007). “Nutrient use efficiency–measurement and management,” in Proceedings of the International Fertilizer Industry Association (IFA) Workshop on Fertilizer Best Management Practices, 7–9 March 2007, Brussels, 1–28.
Examples
PlantNf <- c(2.92, 3.78, 4.68, 4.21)
FertN <- 15
PNB(PlantNf, FertN)
Calculate Total N derived from Fertilizer (TNdfF)
Description
The total quantity of plant or soil N that is derived from fertilizer Calculate TNdfF using the formula: TNdfF = (NdfF/100) * Plant N or Soil N
Usage
TNdfF(NdfF, PlantN = NULL, SoilN = NULL)
Arguments
NdfF |
N derived from Fertilizer expressed as a percentage. |
PlantN |
A numeric vector of values for plant N content. |
SoilN |
A numeric value for soil N content. |
Value
The calculated TNdfF value.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: IAEA (1983). Guide on the Use of Nitrogen-15 and Radioisotopes in Studies of Plant Nutrition: Calculations and Interpretation of Data. Vienna: IAEA.
Examples
NdfF <- 25.98333
SoilN <- 20
PlantN <- c(12.1, 8.99, 12.89, 13.11)
TNdfF(NdfF, PlantN)
TNdfF(NdfF, SoilN)
Calculate Virtual N Factor (VNF)
Description
The portion of the N that is released to the environment during the food production process and is not contained in the food that is consumed Calculate NUEFC using the formula: VNF = Nrec / Ncon
Usage
VNF(Nrec, Ncon)
Arguments
Nrec |
N used to produce food item that ends up recycled |
Ncon |
N in food item that is consumed |
Value
The calculated VNF value
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108 Secondary: Galloway, J. N., Winiwarter, W., Leip, A., Leach, A. M., Bleeker, A., and Erisman, J. W. (2014). Nitrogen footprints: past, present and future. Environ. Res. Lett. 9:115003. doi: 10.1088/1748-9326/9/11/115003
Examples
Nrec <- 7.314
Ncon <- 15.574
VNF(Nrec, Ncon)
Calculate NUEecology
Description
The product of N productivity and the mean residency time (MRT) of plant N. Calculate NUEecology using the formula: ecoNUE = NP * MRT
Usage
ecoNUE(NP, MRT)
Arguments
NP |
Nitrogen Productivity Value |
MRT |
Mean Residency Time value |
Value
The calculated ecoNUE value.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: Lambers, H., and Oliveira, R. S. (eds). (2019). “Mineral Nutrition,” in Plant Physiological Ecology. Cham: Springer International Publishing, 301–384. doi: 10.1007/978-3-030-29639-1_9
Examples
NP <- 33.63571
MRT <- 1.009715
ecoNUE(NP, MRT)
Calculate N Balance Index of a System (sNBI)
Description
The accumulation or reduction of soil N over a set time. Calculate sNBI using the formula: sNBI = Ni - No - delSoilN
Usage
sNBI(Ni, No, delSoilN)
Arguments
Ni |
Sum total of N inputs (enter each value individually) |
No |
Sum total of N outputs (enter each value individually) |
delSoilN |
Change in total soil N value |
Value
The calculated ecoNUE value.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: Sainju, U. M. (2017). Determination of nitrogen balance in agroecosystems. MethodsX 4, 199–208. doi: 10.1016/j.mex.2017.06.001
Examples
Ni <- c(2.92, 3.78, 4.68, 4.21)
No <- c(2.89, 3.66, 4.73, 4.16)
delSoilN <- 0.085
sNBI(Ni, No, delSoilN)
Calculate NUE of a System (sNUE)
Description
The fraction of system N outputs that are captured as N yield rather than lost to the environment Calculate sNUE using the formula: sNUE = (YieldN / (YieldN + Nloss))
Usage
sNUE(YieldN, Nloss)
Arguments
YieldN |
Observed crop yield vector that is attributed to the nitrogen inputs in the system |
Nloss |
The value of nitrogen that is lost from the system and not utilized by the crops. |
Value
The calculated sNUE value.
References
Primary: Congreves, K. A., Otchere, O., Ferland, D., Farzadfar, S., Williams, S., & Arcand, M. M. (2021, June 4). Nitrogen Use Efficiency Definitions of Today and Tomorrow. Frontiers in Plant Science, 12. https://doi.org/10.3389/fpls.2021.637108
Secondary: Martinez-Feria, R. A., Castellano, M. J., Dietzel, R. N., Helmers, M. J., Liebman, M., Huber, I., et al. (2018). Linking crop- and soil-based approaches to evaluate system nitrogen-use efficiency and tradeoffs. Agric. Ecosyst. Environ. 256, 131– 143. doi: 10.1016/j.agee.2018.01.002
Examples
YieldN <- c(5.4, 6.3, 4.8, 7.2)
Nloss <- 3.574
sNUE(YieldN, Nloss)