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Crop coefficient changes with reference evapotranspiration for highly canopy-atmosphere coupled crops

Author

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  • Marin, Fábio R.
  • Angelocci, Luiz R.
  • Nassif, Daniel S.P.
  • Costa, Leandro G.
  • Vianna, Murilo S.
  • Carvalho, Kassio S.

Abstract

Despite of the great advancement of technologies for water supply, irrigation management remains inadequate in most areas. The lack of basic information on crop water needs is one of the causes for inadequate water use and irrigation management. The approach normally used to quantify the consumptive use of water by irrigated crops is the crop coefficient-reference evapotranspiration (Kc ETo) procedure. In this procedure, reference evapotranspiration (ETo) is computed for a grass or alfalfa reference crop and is then multiplied by an empirical crop coefficient (Kc) to produce an estimate of crop evapotranspiration (ETc). The ETo represents the non-stressed ET based on weather data. We selected three experiments with different crops in terms of physiology and planting arrangements to discuss the crop coefficient paradigm and its relation with reference evapotranspiration for highly canopy-atmosphere coupled crops. We found the Kc decreasing as ETo increased as a consequence of high plant atmosphere coupling and high crop inner resistance, which limits the amount of water the plant could supply to the atmosphere. Even for sugarcane plantation (after it completely covered the ground) Kc decreased with ETo, highlighting that trend might not be exclusive of tall sparse crops and for well coupled to the atmosphere. For these reasons, we suggested the definition of Kcb (for sparse crops) and Kc should take into account ETo ranges besides the components currently considered.

Suggested Citation

  • Marin, Fábio R. & Angelocci, Luiz R. & Nassif, Daniel S.P. & Costa, Leandro G. & Vianna, Murilo S. & Carvalho, Kassio S., 2016. "Crop coefficient changes with reference evapotranspiration for highly canopy-atmosphere coupled crops," Agricultural Water Management, Elsevier, vol. 163(C), pages 139-145.
    • Handle: RePEc:eee:agiwat:v:163:y:2016:i:c:p:139-145
    DOI: 10.1016/j.agwat.2015.09.010
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    1. Marin, Fabio R. & Angelocci, Luiz Roberto, 2011. "Irrigation requirements and transpiration coupling to the atmosphere of a citrus orchard in Southern Brazil," Agricultural Water Management, Elsevier, vol. 98(6), pages 1091-1096, April.
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    1. Caitlyn E. Sutherlin & Nathaniel A. Brunsell & Gabriel de Oliveira & Timothy E. Crews & Lee R. DeHaan & Giulia Vico, 2019. "Contrasting Physiological and Environmental Controls of Evapotranspiration over Kernza Perennial Crop, Annual Crops, and C 4 and Mixed C 3 /C 4 Grasslands," Sustainability, MDPI, vol. 11(6), pages 1-14, March.
    2. Mobe, N.T. & Dzikiti, S. & Zirebwa, S.F. & Midgley, S.J.E. & von Loeper, W. & Mazvimavi, D. & Ntshidi, Z. & Jovanovic, N.Z., 2020. "Estimating crop coefficients for apple orchards with varying canopy cover using measured data from twelve orchards in the Western Cape Province, South Africa," Agricultural Water Management, Elsevier, vol. 233(C).
    3. Feng, Xuyu & Liu, Haijun & Feng, Dongxue & Tang, Xiaopei & Li, Lun & Chang, Jie & Tanny, Josef & Liu, Ronghao, 2023. "Quantifying winter wheat evapotranspiration and crop coefficients under sprinkler irrigation using eddy covariance technology in the North China Plain," Agricultural Water Management, Elsevier, vol. 277(C).
    4. Xiang, Keyu & Li, Yi & Horton, Robert & Feng, Hao, 2020. "Similarity and difference of potential evapotranspiration and reference crop evapotranspiration – a review," Agricultural Water Management, Elsevier, vol. 232(C).
    5. Machakaire, A.T.B. & Steyn, J.M. & Franke, A.C., 2021. "Assessing evapotranspiration and crop coefficients of potato in a semi-arid climate using Eddy Covariance techniques," Agricultural Water Management, Elsevier, vol. 255(C).
    6. Wu, Dong & Fang, Shibo & Li, Xuan & He, Di & Zhu, Yongchao & Yang, Zaiqiang & Xu, Jiaxin & Wu, Yingjie, 2019. "Spatial-temporal variation in irrigation water requirement for the winter wheat-summer maize rotation system since the 1980s on the North China Plain," Agricultural Water Management, Elsevier, vol. 214(C), pages 78-86.
    7. Gonçalves, I.Z. & Ruhoff, A. & Laipelt, L. & Bispo, R.C. & Hernandez, F.B.T. & Neale, C.M.U. & Teixeira, A.H.C. & Marin, F.R., 2022. "Remote sensing-based evapotranspiration modeling using geeSEBAL for sugarcane irrigation management in Brazil," Agricultural Water Management, Elsevier, vol. 274(C).
    8. da Silva, Evandro H.F.M. & Gonçalves, Alexandre O. & Pereira, Rodolfo A. & Fattori Júnior, Izael M. & Sobenko, Luiz R. & Marin, Fábio R., 2019. "Soybean irrigation requirements and canopy-atmosphere coupling in Southern Brazil," Agricultural Water Management, Elsevier, vol. 218(C), pages 1-7.
    9. Venturin, Afonso Zucolotto & Guimarães, Claudinei Martins & Sousa, Elias Fernandes de & Machado Filho, José Altino & Rodrigues, Weverton Pereira & Serrazine, Ícaro de Araujo & Bressan-Smith, Ricardo &, 2020. "Using a crop water stress index based on a sap flow method to estimate water status in conilon coffee plants," Agricultural Water Management, Elsevier, vol. 241(C).
    10. Mhawej, Mario & Nasrallah, Ali & Abunnasr, Yaser & Fadel, Ali & Faour, Ghaleb, 2021. "Better irrigation management using the satellite-based adjusted single crop coefficient (aKc) for over sixty crop types in California, USA," Agricultural Water Management, Elsevier, vol. 256(C).

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