Influence of Foliar Application with Potassium and Magnesium on
Growth, Yield and Oil Quality of “Koroneiki” Olive Trees

Mahmoud, Thanaa Sh. M.; Mohamed, Enaam Sh. A.; El-Sharony, T. F.

doi:10.3923/ajft.2017.209.220

Cited by 13 publications

(5 citation statements)

References 14 publications

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“…The higher contents of oleic, linoleic, and linolenic acids from fields C and D could be a result of high soil exchangeable Mg contents from annual fertilizer application, including large quantity of dolomite, which was readily available for sesame plants. Although not in sesame, it was found that the fatty acid composition, especially oleic acid in olive plants, significantly increased due to foliar application of magnesium and potassium sulphate [38]. Similarly, the application of magnesium sulphate containing 16% MgO and 13% S has also been reported to increase sesame oil content [39].…”

Section: Discussionmentioning

confidence: 99%

Fatty Acid Composition of Sesame (Sesamum indicum L.) Seeds in Relation to Yield and Soil Chemical Properties on Continuously Monocropped Upland Fields Converted from Paddy Fields

et al. 2019

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We evaluated the fatty acid compositions in relation to yield and soil nutrients from four fields A, B, C, and D with continuous monocropping histories of 0–3 years, respectively, in Japan from 2015 to 2016. Results showed that, in both evaluation years, seed yield did not significantly differ among the fields although field A produced the highest mean seed yield and 1000-seed weight. Between fields A and C, 1000-seed weight showed significant differences. The contents of seed-saturated fatty acids lauric and myristic decreased in only fields C and D whereas oleic, linoleic, and linolenic acids increased in field D. Only field A produced the highest contents of lauric and myristic acids whereas field D produced the highest contents of linoleic and linolenic acids. The soil total N and exchangeable K contents tended to decrease as exchangeable Mg content significantly increased on the fields with long duration of cropping, fields C and D. Principal component analysis revealed significant positive correlations between soil exchangeable K, and total N contents with 1000-seed weight and lauric acid, as exchangeable Mg content was related with oleic, linoleic, and linolenic acids. Therefore, the high oleic, linoleic, and linolenic acids from field D were mainly attributed to high soil exchangeable Mg content, whereas the high 1000-seed weight, lauric acid and myristic acid were due to the high soil exchangeable K content in field A. Overall, the fatty acid composition quality on the long-duration continuously monocropped fields could show high economic value at the expense of yield under this management practice in continuous monocropping.

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Section: Discussionmentioning

confidence: 99%

Fatty Acid Composition of Sesame (Sesamum indicum L.) Seeds in Relation to Yield and Soil Chemical Properties on Continuously Monocropped Upland Fields Converted from Paddy Fields

et al. 2019

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“…Microelements (B, Zn, Fe), aminoacids and organic acids foliar delivery schemes, where correctional deficiency conditions was not an occurring situation, has been applied in olive trees with positive fruit and growth effects (Başar and Gürel 2016;Nargesi et al 2022;Saadati et al 2013). Major aerial macroelement applications N, P, K, Ca, Mg, S on olive trees are also investigated; results are dependent of each olive tree varietal physiology (Dabbaghi et al 2019;Hagagg et al 2020;Marcelić et al 2022;Regni and Proietti 2019;Saykhul et al 2014;Thanaa et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Foliar Application of Urea as Alternative Nitrogen Nutritional Delivery Scheme for Konservolia and Kalamon Commercial Olive Orchards

Kalorizou,

Makanikas,

Giannoulis

et al. 2023

Agriculture & Food

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Konservolia and Kalamon olive orchards were tested for their vegetative and fruit growth after foliar urea applications served as nitrogen nutritional delivery scheme. Five urea aerial fertilizations (8-65 kg/m 3 /ha) from January to September with summer aerial supplement of buffered KNO3 replaced regular fertilization program for the above-mentioned olive orchards. Despite of different stem growth rates due to seasonal effect on tree physiology, throughout the experimental period no major changes in biomass productivity were observed for both varieties. Final size Konservolia fruits did not differ among conventional and foliar urea treatments. Although Kalamon olive fruits including pit data, differ in size among fertilization strategies with bigger size observed in foliar urea treated areas; their flesh firmness was found to be significantly lower to fruits received from soil fertilized orchards. Both varieties produced olives with increased pit weight and size and lower fruit flesh firmness when trees treated with urea. Konservolia decreases its fruit flesh/pit ratio as opposed to Kalamon where treated trees increased the weight of their commercial fruit flesh. Data suggest that each of tested olive varieties respond differently in foliar application of urea as a replacement of soil fertilization strategies. Results for Konservolia reveal that urea foliar applications can be approached as safe, conservative tactic nutritional replacement to soil fertilization for the orchard trees. For Kalamon variety, aerial treatments positively affect fruit size, increased pit size and flesh/pit ratio providing potentially faster harvest maturity times. This alternative nitrogen fertilization delivery strategy for Kalamon olive orchards can be considered as viable approach to restrict groundwater nitrate leaching and atmospheric pollution from previous fertilization conventional plans and increase fruit biomass for olive oil and olive waste byproducts useful in circular economy.

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“…However, little is known about the effect of foliar sprays of nutrients on the olive oil quality. Some authors have reported the use of the foliar fertilization and its effect on olive oil quality (Tekaya et al, 2012(Tekaya et al, , 2013Mahmoud et al, 2017). Several works have demonstrated that foliar sprays of biostimulants on olive tree improved oil quality characteristics (Chouliaras et al, 2009), mineral content (Zulaikha, 2013) and fruit yield (Chouliaras et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Olive oil quality influenced by biostimulant foliar fertilizers

Zouari¹,

Mechri²,

Tekaya³

et al. 2020

Braz. J. Biol. Sci.

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Foliar fertilization has been used as an important tool to meet the tree nutrient demand and to be an environmental beneficial with the use of little quantities. Actually modern fruit trees physiology is focused on the stimulation of plant cell development and fruit production using biostimulants. In olive trees, few products have been used for improving oil quality. For this purpose, two biostimulants products have been tested and used simple or combined with a third product rich in nitrogen. The treatments were classified to: T1 (rich in nitrogen) and biostimulants treatments as following T2 (combination of boron, magnesium, sulfur and manganese associated with seaweed) TNi (biostimulant combining a protein extract with a calcium base), T12 (combined application of T1 and T2) and finally T12Ni (combined application of T1, T2 and TNi) with a control treatment CON (without foliar fertilization). All these foliar nutrients were sprayed during two successive years on trees issued of Chemlali cultivar cultivated in rain-fed conditions of central Tunisia. Biochemical parameters of the olive oil, like physiochemical characteristics, fatty acid profile total polyphenols, ortho-diphenols, chlorophyllic and carotenoids pigments were analyzed annually after the application of these foliar compounds. All the olive oils issued from the treatments were classified as extra virgin and the physiochemical parameters were sensitive to foliar fertilization except for some parameters. Quantitative changes were observed in the pool of the fatty acids composition and the treatment TNi (rich in calcium) increased significantly the percentage of the monounsaturated fatty acid (MUFA) C18:1 as well as the ratios C18:1/C18:2 and MUFA/polyunsaturated fatty acids (PUFA) during the first year of experimentation. This treatment induced also an increase in the total polyphenols concentration. An annual variation between treatments has been observed according the polyphenols concentration and othodiphenols which can be influenced by climatic conditions principally in rain-fed conditions. This study highlighted the effect of the nutrient availability cumulated after two years of foliar application on the olive oil quality.

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Influence of Foliar Application with Potassium and Magnesium on Growth, Yield and Oil Quality of “Koroneiki” Olive Trees

Cited by 13 publications

References 14 publications

Fatty Acid Composition of Sesame (Sesamum indicum L.) Seeds in Relation to Yield and Soil Chemical Properties on Continuously Monocropped Upland Fields Converted from Paddy Fields

Fatty Acid Composition of Sesame (Sesamum indicum L.) Seeds in Relation to Yield and Soil Chemical Properties on Continuously Monocropped Upland Fields Converted from Paddy Fields

Foliar Application of Urea as Alternative Nitrogen Nutritional Delivery Scheme for Konservolia and Kalamon Commercial Olive Orchards

Olive oil quality influenced by biostimulant foliar fertilizers

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