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Evaluation of regulated deficit irrigation strategies for oil olives: A case study for two modern Israeli cultivars

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  • Ben-Gal, Alon
  • Ron, Yonatan
  • Yermiyahu, Uri
  • Zipori, Isaac
  • Naoum, Sireen
  • Dag, Arnon

Abstract

Profits from olive oil production are expected to benefit from regulated deficit irrigation (RDI) regimes designed to optimize yield and oil quality with minimal inputs of water. We evaluated a number of potential strategies for implementing RDI including choosing phenological periods for reduced irrigation, use of midday stem water potential (SWP) for scheduling, considering fruit load, and irrigation to reach optimal fruit water content at harvest. We base our discussion on the potentials and challenges of practical commercial RDI regimes on results from a 6-year orchard experiment on two olive oil cultivars used in intensive orchards ('Barnea' and 'Askal') in Israel, focusing on attempts for long-tern optimization of yield and oil quality. Results showed a general trend of increased water productivity as a function of reduced irrigation but since yields tended to be reduced when irrigation was decreased, there was not a clear benefit of RDI over sustained deficit irrigation. The exception to this was a treatment based on SWP where water application was reduced by some 40% compared to irrigation regimes bringing highest yields, and a non-significant accumulated yield reduction of less than 15% after 6 years in both cultivars. Oil quality, measured in terms of free fatty acids and polyphenol content, was often improved when irrigation was decreased, with no dependence on the seasonal timing of deficit amounts and increased tree water stress.

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  • Ben-Gal, Alon & Ron, Yonatan & Yermiyahu, Uri & Zipori, Isaac & Naoum, Sireen & Dag, Arnon, 2021. "Evaluation of regulated deficit irrigation strategies for oil olives: A case study for two modern Israeli cultivars," Agricultural Water Management, Elsevier, vol. 245(C).
    • Handle: RePEc:eee:agiwat:v:245:y:2021:i:c:s0378377420321247
    DOI: 10.1016/j.agwat.2020.106577
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    References listed on IDEAS

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    1. Agam, N. & Cohen, Y. & Berni, J.A.J. & Alchanatis, V. & Kool, D. & Dag, A. & Yermiyahu, U. & Ben-Gal, A., 2013. "An insight to the performance of crop water stress index for olive trees," Agricultural Water Management, Elsevier, vol. 118(C), pages 79-86.
    2. Ben-Gal, Alon & Kool, Dilia & Agam, Nurit & van Halsema, Gerardo E. & Yermiyahu, Uri & Yafe, Ariel & Presnov, Eugene & Erel, Ran & Majdop, Ahmed & Zipori, Isaac & Segal, Eran & Rüger, Simon & Zimmerma, 2010. "Whole-tree water balance and indicators for short-term drought stress in non-bearing 'Barnea' olives," Agricultural Water Management, Elsevier, vol. 98(1), pages 124-133, December.
    3. Erel, Ran & Eppel, Amir & Yermiyahu, Uri & Ben-Gal, Alon & Levy, Guy & Zipori, Isaac & Schaumann, Gabriele E. & Mayer, Oliver & Dag, Arnon, 2019. "Long-term irrigation with reclaimed wastewater: Implications on nutrient management, soil chemistry and olive (Olea europaea L.) performance," Agricultural Water Management, Elsevier, vol. 213(C), pages 324-335.
    4. Gucci, Riccardo & Caruso, Giovanni & Gennai, Clizia & Esposto, Sonia & Urbani, Stefania & Servili, Maurizio, 2019. "Fruit growth, yield and oil quality changes induced by deficit irrigation at different stages of olive fruit development," Agricultural Water Management, Elsevier, vol. 212(C), pages 88-98.
    5. Fernandes, Rafael Dreux Miranda & Cuevas, Maria Victoria & Diaz-Espejo, Antonio & Hernandez-Santana, Virginia, 2018. "Effects of water stress on fruit growth and water relations between fruits and leaves in a hedgerow olive orchard," Agricultural Water Management, Elsevier, vol. 210(C), pages 32-40.
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    2. Vita Serman, Facundo & Orgaz, Francisco & Starobinsky, Gabriela & Capraro, Flavio & Fereres, Elias, 2021. "Water productivity and net profit of high-density olive orchards in San Juan, Argentina," Agricultural Water Management, Elsevier, vol. 252(C).
    3. Sánchez-Piñero, M. & Martín-Palomo, M.J. & Andreu, L. & Moriana, A. & Corell, M., 2022. "Evaluation of a simplified methodology to estimate the CWSI in olive orchards," Agricultural Water Management, Elsevier, vol. 269(C).
    4. Martínez-Gimeno, M.A. & Zahaf, A. & Badal, E. & Paz, S. & Bonet, L. & Pérez-Pérez, J.G., 2022. "Effect of progressive irrigation water reductions on super-high-density olive orchards according to different scarcity scenarios," Agricultural Water Management, Elsevier, vol. 262(C).

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