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Deficit irrigation limits almond trees’ photosynthetic productivity and compromises yields

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  • Sperling, Or
  • Gardi, Ido
  • Ben-Gal, Alon
  • Kamai, Tamir

Abstract

Almond yields vary between rainfed and intensively irrigated systems, but how to match irrigation to potential productivity is unclear. Hence, we compared almond physiology under deficit (600 mm) and full (1300 mm) irrigation to identify stress indices and determine the production overheads of mismanaged watering. We hypothesized that trees alter their growth to conserve resources during drought and mitigate their hydraulic stress responses. Thus, we monitored stem water potential and stomatal conductance to characterize the hydraulic responses of trees to deficient and hydrated water conditions. Adapting the seasonal relationship between irrigation coefficients and tree water potential was also tested. Finally, soil water status and trunk development were considered physical stress indices for field conditions. Soil water depletion in deficit irrigation reduced stem water potential below − 2 MPa and checked stomatal conductance at 0.15 mol m-2 s-1 for most of the growing season. An empirical productivity model determined that, under deficit irrigation, almond trees suffer from chronic stress that limits their photosynthetic capacity to ∼14 µmol m-2 s-1. Consequently, nominal assimilation limitations (10%) in early summer manifested to 4 kg C tree-1 metabolic losses by autumn. The inter-annual vegetative limitations in deficit irrigation resulted in significant yield reductions (35%) by the second experimental season. Temporal changes in the correlations between stem water potential, stomatal conductance, and trunk contractions made it difficult to use water stress indices to make irrigation decisions. However, normalizing tree performance by phenology indicated a 960 mm irrigation that supported high yields. Further, integrating the variability in soil water with trunk dendrometry illustrated that trees could maintain constant growth between irrigation days under well-watered conditions. Hence, in commercial operations, variable growth rates and trunk contraction measures signal insufficient irrigation and could guide practical irrigation adaptations.

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  • Sperling, Or & Gardi, Ido & Ben-Gal, Alon & Kamai, Tamir, 2023. "Deficit irrigation limits almond trees’ photosynthetic productivity and compromises yields," Agricultural Water Management, Elsevier, vol. 289(C).
    • Handle: RePEc:eee:agiwat:v:289:y:2023:i:c:s0378377423004274
    DOI: 10.1016/j.agwat.2023.108562
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    References listed on IDEAS

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    1. Girona, J. & Mata, M. & Marsal, J., 2005. "Regulated deficit irrigation during the kernel-filling period and optimal irrigation rates in almond," Agricultural Water Management, Elsevier, vol. 75(2), pages 152-167, July.
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    1. Wen, Shenglin & Cui, Ningbo & Wang, Yaosheng & Gong, Daozhi & Xing, Liwen & Wu, Zongjun & Zhang, Yixuan & Zhao, Long & Fan, Junliang & Wang, Zhihui, 2024. "Optimizing deficit drip irrigation to improve yield,quality, and water productivity of apple in Loess Plateau of China," Agricultural Water Management, Elsevier, vol. 296(C).

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