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Calibration and Evaluation of the FAO AquaCrop Model for Canola ( Brassica napus ) under Varied Moistube Irrigation Regimes

Author

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  • Tinashe Lindel Dirwai

    (School of Engineering, University of KwaZulu-Natal, P. Bag X01, Pietermaritzburg 3209, South Africa
    VarMac Consulting Engineers, Scottsville, Pietermaritzburg 3209, South Africa)

  • Aidan Senzanje

    (School of Engineering, University of KwaZulu-Natal, P. Bag X01, Pietermaritzburg 3209, South Africa)

  • Tafadzwanashe Mabhaudhi

    (Center for Transformative Agricultural and Food Systems, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, P. Bag X01, Pietermaritzburg 3209, South Africa)

Abstract

The AquaCrop model was calibrated and validated for canola ( Brassica napus ) under Moistube irrigation (MTI) and various water regimes [(i) 100%, (ii) 75%, and (iii) 55% of crop water requirement ( ET c )] over two seasons, 2019 and 2020. The normalised root mean square ( nRMSE ), Model Efficiency ( EF ), R 2 , and the Willmot’s index of agreement ( d ) statistics were used to evaluate the model’s efficiency in simulating biomass ( B ), canopy cover ( CC ), yield ( Y ), and harvest index ( HI ). The calibration results indicated the model simulated with accuracy the CC (under 100% ET c R 2 = 0.99, EF = 0.92, nRMSE = 6.4%, d = 0.98) and 75% ET c ( R 2 = 0.99, EF = 0.92, nRMSE = 10.3%, d = 0.98). The model simulated CC well for validation for 100% ET c ( R 2 = 0.97, EF = 0.93, nRMSE = 22.5%, d = 0.98) and 75% ET c ( R 2 = 0.84, EF = 0.45, nRMSE = 59.2%, d = 0.86) irrigation regimes. Final biomass simulations were reasonably good under 100% ET c , 75% ET c , and 55% ET c irrigation regimes ( R 2 > 0.90, d > 0.65). The study showed the usefulness of AquaCrop for assessing yield response of canola to full and deficit irrigation scenarios under MTI.

Suggested Citation

  • Tinashe Lindel Dirwai & Aidan Senzanje & Tafadzwanashe Mabhaudhi, 2021. "Calibration and Evaluation of the FAO AquaCrop Model for Canola ( Brassica napus ) under Varied Moistube Irrigation Regimes," Agriculture, MDPI, vol. 11(5), pages 1-18, May.
    • Handle: RePEc:gam:jagris:v:11:y:2021:i:5:p:410-:d:548207
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    References listed on IDEAS

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    Cited by:

    1. Mabhaudhi, Tafadzwanashe & Dirwai, Tinashe Lindel & Taguta, Cuthbert & Sikka, Alok & Lautze, Jonathan, 2023. "Mapping Decision Support Tools (DSTs) on agricultural water productivity: A global systematic scoping review," Agricultural Water Management, Elsevier, vol. 290(C).
    2. Aleksei Dobrokhotov & Ludmila Kozyreva & Mariia Fesenko & Victoria Dubovitskaya & Sofia Sushko, 2023. "Soil Sulfur Deficiency Restricts Canola ( Brassica napus ) Productivity in Northwestern Russia Regardless of NPK Fertilization Level," Agriculture, MDPI, vol. 13(7), pages 1-13, July.

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