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Physiological responses of almond trees under regulated deficit irrigation using saline and desalinated reclaimed water

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  • Vivaldi, Gaetano Alessandro
  • Camposeo, Salvatore
  • Romero-Trigueros, Cristina
  • Pedrero, Francisco
  • Caponio, Gabriele
  • Lopriore, Giuseppe
  • Álvarez, Sara

Abstract

Regulated deficit irrigation (RDI) strategy using reclaimed water (RW) is becoming a common procedure in some Mediterranean regions. Full and regulated deficit irrigation were combined with desalinated (ECw 1 dS m−1) and saline (ECw 3 dS m−1) reclaimed water to irrigate young potted almond trees over a 3-year period. The full irrigation treatments received 130% of the crop evapotranspiration (ETc) and the RDI treatments received 80% of ETc during the kernel filling. Trunk diameter decreased in both RDI treatments at the end of the experimental period, although this response was more marked in the trees irrigated with saline RW. There were negative relationships between shoot growth and leaf Na+ and Cl+ contents in the saline treated trees, in which the accumulation of salts in leaves was associated with osmotic adjustment, which was responsible for maintaining midday leaf turgor. Plant water status, measured by the leaf and water potential, decreased in almond exposed to water deficit or irrigated with saline RW, indicating a slight dehydration in these plants due to the difficulty in water uptake from the substrate. Trees subjected to both deficit irrigation treatments showed lower stomatal conductance values than full irrigated treatments during the RDI period. However, at the end of experimental period, the lowest Pn values were found in plants irrigated with saline RW, especially in trees irrigated with saline RW combined with RDI strategy, verifying the relevance of duration of exposure to the stress. Saline and desalinated RW can be successfully used for irrigating almond trees, which might be of great economic and competitive significance for agriculture, but further research focused on a longer term should be carried out since detrimental effects might appear. Deficit irrigation combined with saline RW in P. dulcis is not recommended since it intensifies the negative effects of water and salt stress applied individually.

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  • Vivaldi, Gaetano Alessandro & Camposeo, Salvatore & Romero-Trigueros, Cristina & Pedrero, Francisco & Caponio, Gabriele & Lopriore, Giuseppe & Álvarez, Sara, 2021. "Physiological responses of almond trees under regulated deficit irrigation using saline and desalinated reclaimed water," Agricultural Water Management, Elsevier, vol. 258(C).
    • Handle: RePEc:eee:agiwat:v:258:y:2021:i:c:s0378377421004492
    DOI: 10.1016/j.agwat.2021.107172
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