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Article

Combined Sulfur and Nitrogen Foliar Application Increases Extra Virgin Olive Oil Quantity without Affecting Its Nutritional Quality

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Department for Ecology, Agronomy and Aquaculture, University of Zadar, Trg Kneza Višeslava 9, 23000 Zadar, Croatia
2
Department of Agriculture and Nutrition, Institute of Agriculture and Tourism, Karla Huguesa 8, 52440 Poreč, Croatia
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Department of Applied Sciences, Institute for Adriatic Crops and Karst Reclamation, Put Duilova 11, 21000 Split, Croatia
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Centre of Excellence for Biodiversity and Molecular Plant Breeding, Svetošimunska 25, 10000 Zagreb, Croatia
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Department of Plant Nutrition, Division for Agroecology, Faculty of Agriculture, University of Zagreb, Svetošimunska 25, 10000 Zagreb, Croatia
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Department of Plant Breeding, Genetics and Biometrics, Division for Plant Sciences, Faculty of Agriculture, University of Zagreb, Svetošimunska 25, 10000 Zagreb, Croatia
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Department of Biology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 111, 1000 Ljubljana, Slovenia
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Department of Low and Medium Energy Physics, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editors: Tetsuya Matsukawa and Othmane Merah
Horticulturae 2022, 8(3), 203; https://doi.org/10.3390/horticulturae8030203
Received: 31 December 2021 / Revised: 21 February 2022 / Accepted: 21 February 2022 / Published: 25 February 2022
(This article belongs to the Special Issue Related Studies on Horticultural Tree Leaves)
This study investigates the effect of combined sulfur (S) and nitrogen (N) foliar fertilization on leaf S and N concentration, as well as on the growth of olive fruit and on the quantity and quality of olive oil, obtained from two olive cultivars ‘Istarska bjelica’ and ‘Leccino’ in two consecutive years. S and N are some of the most important nutrients, and both play a crucial role in plant oil production. The here-reported fertilization program significantly increased S concentration in leaves without affecting N concentration, which led to an increase in fruit yield and improvement of all fruit morphological parameters. The best oil yield per tree was obtained under the treatment with the highest S/N dose. Oil quality was not affected by S and N supply, and this allowed us to classify all our oil samples as extra virgin (EVOO). Regarding the content of total phenols (TPC) and composition of fatty acid methyl esters (FAME), they remained unaltered under the applied treatments. All investigated fruit morphological parameters, as well as fruit and oil yield, were highly cultivar-dependent. ‘Istarska bjelica’ was characterized as a cultivar with higher fruit mass and pulp percentage, while its stone parameters were lower than those of ‘Leccino’. Consequently, the extraction oil yield obtained from ‘Istarska bjelica’ fruits was much higher. Moreover, environmental conditions had a great impact on fruit and oil quantity. The here-obtained results led us to the conclusion that supply of S and N can enhance oil production without affecting its nutritional quality, a finding that could generate large long-term effects on economic growth in the olive oil sector. View Full-Text
Keywords: cv. ‘Istarska bjelica’; cv. ‘Leccino’; leaves; EVOO; Olea europaea L.; S/N foliar fertilization; total phenolic content; olive fruit morphology; free fatty acid content; peroxide value cv. ‘Istarska bjelica’; cv. ‘Leccino’; leaves; EVOO; Olea europaea L.; S/N foliar fertilization; total phenolic content; olive fruit morphology; free fatty acid content; peroxide value
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MDPI and ACS Style

Marcelić, Š.; Vidović, N.; Pasković, I.; Lukić, M.; Špika, M.J.; Palčić, I.; Lukić, I.; Petek, M.; Pecina, M.; Herak Ćustić, M.; Ban, D.; Grozić, K.; Polić Pasković, M.; Cukrov, M.; Pongrac, P.; Goreta Ban, S. Combined Sulfur and Nitrogen Foliar Application Increases Extra Virgin Olive Oil Quantity without Affecting Its Nutritional Quality. Horticulturae 2022, 8, 203. https://doi.org/10.3390/horticulturae8030203

AMA Style

Marcelić Š, Vidović N, Pasković I, Lukić M, Špika MJ, Palčić I, Lukić I, Petek M, Pecina M, Herak Ćustić M, Ban D, Grozić K, Polić Pasković M, Cukrov M, Pongrac P, Goreta Ban S. Combined Sulfur and Nitrogen Foliar Application Increases Extra Virgin Olive Oil Quantity without Affecting Its Nutritional Quality. Horticulturae. 2022; 8(3):203. https://doi.org/10.3390/horticulturae8030203

Chicago/Turabian Style

Marcelić, Šime, Nikolina Vidović, Igor Pasković, Marina Lukić, Maja J. Špika, Igor Palčić, Igor Lukić, Marko Petek, Marija Pecina, Mirjana Herak Ćustić, Dean Ban, Kristina Grozić, Marija Polić Pasković, Marin Cukrov, Paula Pongrac, and Smiljana Goreta Ban. 2022. "Combined Sulfur and Nitrogen Foliar Application Increases Extra Virgin Olive Oil Quantity without Affecting Its Nutritional Quality" Horticulturae 8, no. 3: 203. https://doi.org/10.3390/horticulturae8030203

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