04
juillet
2026
- Titre : Variabilité bioclimatique de l’oliveraie du Centre-Est Tunisien, cas de Sfax, dans un contexte de changement climatique
- DOI: 10.71751/JAAOGv2i2y2023-9-31
- Auteur : Mohamed Feki; Olfa Elloumi
- Abstract : Olive growing is one of the oldest crops in Tunisia and takes a place of choice both in ecological and agricultural plans and in socio-economic plans. However, this crop, mainly conducted in dry farming, is threatened by the global warming which leads to an advancement of these phenological stages and sometimes a modification of the quality of the olive oils. In this paper, the temporal variability of temperatures in the Sfax region, the first producer and exporter of olive oil in the country, was analysed with a multi-scalar approach. Firstly, the temporal evolution of temperatures showed a general warming since the mid-1980s for annual temperatures, and the early 1980s and 1990s for monthly temperatures. Secondly, the effects of this warming on the olive tree during its vegetative period (between March and the beginning of November) were studied and highlighted an increase in degree days since the mid-1980s. Finally, the analysis of the frequency of occurrence of atmospheric circulation types and their manifestations in terms of "mildness situation" over the region, from December to February, allowed to explain the variability of the olive tree budburst date and the precocity observed since 2014.
- Pagination : 9-31
04
juillet
2026
- Titre : Physico-chemical characteristics of pistachio kernel accessions growing under South Mediterranean conditions
- DOI: 10.71751/JAAOGv3i1y2024-1-8
- Auteur : Mohamed Ayadi; AzzaChelli Chaabouni; Kawthar Ben Mansour; Imen Ouerghui; Moez Mkadmi
- Abstract : In the Mediterranean region, pistachio mainly grows under rainfed conditions generating relatively low and alternating yields. This study focused on kernel quality assessment for their possible valorization to compensate for these low performances. The biochemical and mineral characteristics of seven pistachio kernel accessions (Mateur’, ‘El Guettar’, ‘Meknassy’, ‘Achouri’, ‘Kermezi’, ‘TLII/3’, and ‘TL6/6’) were determined. The studied parameters were moisture content, fat content, biochemical analyses of the oil, and mineral composition of kernel powder after oil extraction. Results showed that all studied accessions ranged in the quality level of international standards for moisture rates (37- 4.7%). Fat content varied from 28% (TL 6/6) and 61.3% (Achouri). The oil's fatty acid compositions exhibited high variations in oleic, linoleic, and linolenic acids between the studied accessions. The oleic/linoleic (O/L) acid ratios, commonly used to predict the oil's chemical stability and shelf life, were comparable to those reported in other producing countries and ranged between 2.7 and 4.9. The obtained results distinguish a few varieties according to their kernel qualities: Achouri for the oil chemical stability and the high fat and oleic acid contents; TL II/3 was the richest in chlorophylls, carotenoids, and polyphenols indicating high antioxidant capacities; Meknassy for its richness in potassium and calcium and its high oil yield; and El Guettar for the yield and stability of its oil and the richness of its kernels in proteins and potassium.
- Pagination : 1-8
04
juillet
2026
- Titre : Effets de la salinité et le climat sur le potentiel reproductif de l’olivier (Olea europaea L.) soumis sous différents régimes hydriques et en pluvial en milieu aride
- DOI: 10.71751/JAAOGv3i2y2024-1-14
- Auteur : Lina Trabelsi, Kamel Gargouri, Fathi Ben Amar, Ameni Ben Hassena, Mohamed Ghrab, Olfa Elloumi, Mohieddine Ksantini, Radhia Gargouri
- Abstract : The development of competitive and sustainable olive culture faces several challenges: limited water resources in quantity and quality, increased areas of olive trees, intensification of cultivation in arid and semi-arid zones and increasing the use of water for irrigation. These require the development of practical tools to improve the sustainable water management. However, the extension of this agricultural practice involves the rate of the effect of irrigation with saline water on the plant to resist to constraining environment conditions and the proper method of irrigation. The main objective of this project was the evaluation of the impact of the application of various irrigation treatments on the phenological behavior of the olive tree in arid region. The assessment of the impact of saline water has been evaluated during dry and rainy periods. Different water regimes were applied in an arid intensive orchard (625 trees/ha). The experiment was conducted in an experimental olive grove during 2015-2017. Five treatments were applied: 100% evapotranspiration (ETc) with saline water (EC = 7.5 mS/cm), full irrigation (100% ETc) using tap water (EC = 2.46 mS/cm) and 50% ETc with two modes of intake: regulated deficit irrigation (RDI) and partial root drying (PRD) using the partial desiccation method of the rhizosphere with saline water. The monitoring concerned the phenology. In conclusion, the irrigation with saline water didn’t affect the phonological behavior with an optimal result for the regulated deficit irrigation system (RDI). The Chemlali cultivar was therefore able to adapt to the conditions of water and a saline stress.
- Pagination : 1-14
