The effects of different harvest maturity and methods on fruit and oil quality of olive (Olea europea L. cv. Ayvalık Yağlık)
Abstract
Objective: This study was conducted to determine the effects of harvest time and method on fruit and oil characteristics of ‘Ayvalık Yağlık’, a major olive cultivar in Turkey.
Material and Methods: Early, optimum and late harvests were made by hitting with a wood stick (control), pneumatic beater, and branch shaker in a conventional olive grove located in Edremit district of Balıkesir province in western Turkey. Harvested olive fruits were stored at 18-20°C for 3 days, and physical, biochemical attributes, free acidity, and fatty acid composition, and mechanical damage caused by tested harvest methods were evaluated.
Results: Mechanical damage index and free fatty acidity were lower in olive fruits harvested by branch shakers compared to those dropped down by stick. Fruit weight, maturity index, oil content and linoleic acid content increased with the progress of harvest date, while color, moisture content, free fatty acids, total phenolics, and palmitic, stearic, and linolenic acid ratio decreased at the last harvest date.
Conclusion: The results showed that significant changes in some physical and chemical properties of the olive fruit occur with the progression of maturity, and using branch shakers and harvesting on the 2nd and 3rd harvest dates are recommended for Ayvalık variety under the experimental site conditions.
Keywords
Fatty acid composition, fruit maturity, harvest date, mechanical damage, Olea europaea L.
Supporting Institution
Ege Üniversitesi BAP Koordinasyon Birimi
Project Number
16-ZRF-045
Thanks
Halil Esen
References
- Al-Maaitah, M.I., K.M. Al-Absi & A. Al-Rawashdeh, 2009. Oil quality and quantity of three olive cultivars as influenced by harvesting date in the middle and southern parts of Jordan. International Journal of Agriculture and Biology, 11: 266-272.
- Ahmad, R. & S. Ayoub, 2014. A Comparative study of hand-held harvesting machine with traditional methods used for olive harvesting in Jordan. Proceedings of the 5th Int. Conf. Olivebioteq 2014.
- Alowaiesh, B., Z. Singh & S.G. Kailis, 2016. Harvesting time influences fruit removal force, moisture, oil content, free fatty acids and peroxide in the oil of Frantoio and Manzanilla olive cultivars. Australian Journal of Crop Science, 10: 1662-1668.
- Amirante, P., A. Tamborrino & A. Leone, 2012. Olive harvesting mechanization systems in high-density orchards. Acta Horticulturae, 949: 351-358.
- Anonymous, 1973. Yemeklik Zeytinyağı Muayene Metodları. TS.342 Türk Standartları. Necatibey Cad. 112, Bakanlıklar, Ankara.
- Anonymous, 1987. Standard methods for the analysis of oils, fats, and derivates. International Union of Pure and Applied Chemistry, 7th., Blackwell Scientific Publications., UIPAC Method 2.301.
- Anonymous, 2000. Yağlı tohumlar - Yağ muhtevasının tayini, TS 973 EN ISO 659.
- Anonymous, 2001. Yaglı tohumlar - Rutubet ve Uçucu Madde Muhtevasının Tayini. TSE 1632.
- Aygun, İ., E. Urkan, F.N. Alayunt, H. Yalçın & A.B. Tekin, 2019. İzmir ilinde zeytin hasadında kullanılan yerli ve ithal çırpıcı tip makinaların hasat performanslarının değerlendirilmesi. Bursa Uludag Üniversitesi Ziraat Fakültesi Dergisi, 33(2): 265-271.
- Ayton J., R.J. Mailer, A. Haigh, D. Tronson & D. Conlan, 2007. Quality and oxidative stability of Australian olive oil according to harvest date and irrigation. Journal of Horticultural Science, 69(1): 67-73.