title: The Effects of Different Irrigation Treatments on Olive Oil Quality and Composition: A Comparative Study between Treated and Olive Mill Wastewater.
abstract: In the present paper, two irrigation treatments were applied to olive trees cv. Chemlali: irrigation with treated wastewater (TWW) and with olive mill wastewater (OMW), which was spread at three levels (50, 100, and 200 m(3)/ha). This work is interested in two topics: (1) the influence of different irrigation treatments on olive oil composition and quality and (2) the comparison between OMW and TWW application using different statistical analyses. The obtained variance analysis (ANOVA) has confirmed that there are no significant differences in oil quality indices and flavonoids between the control and treatments amended by OMW or TWW (p > 0.05). However, the irrigation affected some aspects of olive oil composition such as the reduction in palmitic acid (16.32%) and increase in linoleic acid (19.55%). Furthermore, the total phenols and α-tocopherol contents increased significantly following OMW and TWW treatments. Principal component analysis (PCA) and hierarchical cluster analysis (HCA) defined three irrigation groups: OMW 50 and 100 m(3)/ha, OMW 200 m(3)/ha and control, and TWW treatment. The full factorial design revealed that OMW amendment by 100 m(3)/ha is the best irrigation treatment. Thus, the optimal performances in terms of olive oil quality and composition were shown by olive oil extracted from olives grown under irrigation with 100 m(3)/ha of OMW.
authors.affiliation: Laboratoire d'Electrochimie et Environnement, Ecole Nationale d'Ingénieurs de Sfax, Université de Sfax , BP 1173, 3038 Sfax, Tunisia.
authors.forename: Samia
authors.initials: S
authors.lastname: Ben Brahim
authors.affiliation: Laboratoire d'Electrochimie et Environnement, Ecole Nationale d'Ingénieurs de Sfax, Université de Sfax , BP 1173, 3038 Sfax, Tunisia.
authors.forename: Boutheina
authors.initials: B
authors.lastname: Gargouri
authors.affiliation: Laboratoire d'Electrochimie et Environnement, Ecole Nationale d'Ingénieurs de Sfax, Université de Sfax , BP 1173, 3038 Sfax, Tunisia.
authors.forename: Fatma
authors.initials: F
authors.lastname: Marrakchi
authors.affiliation: Laboratoire d'Electrochimie et Environnement, Ecole Nationale d'Ingénieurs de Sfax, Université de Sfax , BP 1173, 3038 Sfax, Tunisia.|Institut Supérieur de Biotechnologie de Sfax, Université de Sfax , BP 1175, 3038 Sfax, Tunisia.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Bouaziz
mesh_terms: D057914:Agricultural Irrigation; D031658:Olea / Q000737:chemistry / Q000254:growth & development* / Q000378:metabolism; D000069463:Olive Oil / Q000737:chemistry*; D014866:Waste Products / Q000032:analysis*; D062065:Wastewater / Q000032:analysis*; D014867:Water / Q000032:analysis / Q000378:metabolism
chemical_list: D000069463:Olive Oil; D014866:Waste Products; D062065:Wastewater; D014867:Water
keywords: fatty acids; irrigation; olive mill wastewater; olive oil quality; polyphenols; treated wastewater