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Accueil du site → Doctorat → Australie → 2006 → The effect of harvest timing and irrigation on the quality of olive oil

University of Western Sydney (2006)

The effect of harvest timing and irrigation on the quality of olive oil

Ayton, Jamie Graham

Titre : The effect of harvest timing and irrigation on the quality of olive oil

Auteur : Ayton, Jamie Graham

Grade : Doctor of Philosophy PhD 2006

Université de soutenance : School of Natural Sciences. University of Western Sydney.

Résumé
Olive oil production in Australia has increased significantly in the past decade. and will soon reach about forty thousand tonnes per annum. While some Mediterranean countries have well established, modern olive oil industries, the Australian industry is still in its infancy. In order to compete in the world market, the Australian olive oil industry requires information on the response of olive cultivars in Australian conditions, especially when to harvest and irrigate to produce high quality olive oil This study investigated the effect of harvest timing and irrigation on the quality of olive oil. It was conducted on a commercial olive grove in southern New South Wales over a three year period. It involved harvesting, extraction and analysis of the oil at 6 harvest times from early February to late July. Three commercial olive cultivars – Mission, Paragon and Corregiolla were studied. The oil was analysed for free fatty acids, peroxide value, total polyphenol content, induction time, fatty acid profile, chlorophyll content and tocopherols. Results indicate that harvest timing has a significant effect on some of these components of the olive oil. Free fatty acids tended to increase as the season progressed, whereas polyphenols and hence induction time, or stability decreased significantly. A number of irrigation regimes were imposed in this study, although management was difficult due to drought conditions and lack of available water. Very few significant differences were found with irrigation effects. This study provides very useful information and guidelines not only for the Australian olive industry, but also for the international olive oil producing community.

Mots clés : olive oil • Australia ; olive growing • Australia ; olive harvesting • Australia ; irrigation of olive plantations • Australia ;

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Page publiée le 10 mars 2007, mise à jour le 14 janvier 2021