Intervention effectmodel-written summary

Reduced fertilization under recycled wastewater increased Leccino oil TPC by more than 25% versus recommended fertilization.

A claim from Effects of reclaimed wastewater irrigation and fertigation level on olive oil composition and quality · 2019

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Taxon: oliveOlea europaeat0
Material: Leccinoe0
Treatment: RWW irrigation with reduced fertilization (Re–)e0
Outcome: TPCe0
Direction: highere0
Value: 25%e0
Comparator: treatments with the recommended fertilizatione0

Not reportedGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSettingQualifier

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

*Olea europaea* · TaxonHans Hillewaert · CC BY-SA 3.0 · Wikimedia Commons ↗

Verbatim

e0
“higher TPC were observed in oils obtained from RWW irrigation with reduced fertilization (Re–) as compared to the treatments with the recommended fertilization [freshwater irrigation (Fr) and RWW irrigation (Re+) with standard dose of fertilizers], where the TPC increment exceeded 70% in Barnea and 25% in Leccino”
✓ located verbatim in the source · abstract, characters 943–1257

t0
“olive oil composition and quality”
✓ located verbatim in the source · title, characters 68–101

Title

Effects of reclaimed wastewater irrigation and fertigation level on olive oil composition and quality

Loai Basheer; Arnon Dag; Uri Yermiyahu; et al. Journal of the Science of Food and Agriculture 2019. doi:10.1002/jsfa.9911

Other claims from this paper (9)

Intervention effect Long term recycled wastewater irrigation had no significant negative effect on oil composition or quality in Barnea olive.
Intervention effect Long term recycled wastewater irrigation had no significant negative effect on oil composition or quality in Leccino olive.
Observation Average FFA content for both cultivars was below 0.8% for most of the study.
Observation Barnea FFA reached 1.4% in 2009 and 2012–2013.
Observation Barnea peroxide value was below 9 mmol O 2 kg ‐1 oil.
Observation Leccino peroxide value was below 5 mmol O 2 kg ‐1 oil.
Intervention effect Reduced fertilization under recycled wastewater increased Barnea oil TPC by more than 70% versus recommended fertilization.
Intervention effect Treatments slightly altered C18:2 and C18:3 fatty acid levels.
Recommendation The authors found RWW with adjusted fertilization suitable for olive irrigation while maintaining yield and oil quality.

Record rev-a2c878271ac8bb451c3f31cad33e4412e4117f2db3f8c2cf90bc4a39ca54f415 · schema claims-v0.9 · position 8 in the model’s answer

fertilization · quality: phytochemicals · Olea europaea (common olive)Positive and negative results

7 papers: 4 positive, 3 negative or no effect

3 papers in the same direction as this claim · 3 in the opposite direction

negative
Traditional fertilization decreased polyphenols in olive oil compared with the foliar-diagnosis practice.
Foliar diagnosis as a guide to olive fertilization · 2009 · compared with fertilization practice based on foliar diagnosis
Opposite direction
negative
Foliar fertilisation significantly decreased polyphenol and o-diphenol contents of olive oil.
Effect of nutrient‐based fertilisers of olive trees on olive oil quality · 2012
Opposite direction
no effect
Polyphenols concentration of Manzanilla de Sevilla olives did not differ between fertigation treatments.
Effect of Fertigation on the ‘Manzanilla de Sevilla’ Table Olive Quality Before and After “Spanish-style” Green Processing · 2008 · compared with between treatments
Opposite direction
positive
Nano-K1 strongly enhanced total phenol compound in oil.
Response of olive (Olea europaeaL.) trees to foliar spray of nano chelated and chemical potassium fertilizers · 2022
Same direction
positive
Farm yard manure produced olive oil with among the highest phenols and oxidative stability.
INFLUENCE OF ORGANIC FERTILIZATION AND IRRIGATION ON QUALITY OF MARAQI CULTIVAR VIRGIN OLIVE OIL · 2014
Same direction
positive
Results indicated that soil application of organic manure (poultry manure) at 8 Kg/tree significantly increased all studied characters {average leaf area, chlorophyll content, Protein % in Leaves, Fruit Total Soluble Solids TSS %, Total Carbohydrates %, Anthocyanin Content, Ascorbic acid (Vit.C), Percentage of Oil}.
Effect of organic manure, Biofertilizer and foliar spray of Ascorbic acid on vegetative growth and fruit quality of Basheqi cv. of Olive (Olea europaea L.) · 2023
Same direction

See all 7 papers →

irrigation · quality: phytochemicals · Olea europaea (common olive)Positive and negative results

18 papers: 12 positive, 6 negative or no effect

11 papers in the same direction as this claim · 6 in the opposite direction

negative
More irrigation decreased VOO total phenol content.
The effect of irrigation level and harvest mechanization on virgin olive oil quality in a traditional rain‐fed ‘Souri’ olive orchard converted to irrigation · 2008
Opposite directionCited by this paper
negative
Irrigation reduced the total phenol compound content of olive oil compared with the rainfall plot.
Irrigation effects on phenolic profile and extra virgin olive oil quality of ''Chemlali'' variety grown in South Tunisia · 2021 · compared with rainfall plot
Opposite directionCites this paper
no effect
Irrigation had no clear or consistent effect on phenol contents.
Chemical composition of virgin olive oils from Koroneiki cultivar grown in Tunisia with regard to fruit ripening and irrigation regimes · 2011
Opposite direction
no effect
Total phenols and secoiridoids concentration was not affected by irrigation.
Effect of Different Watering Regimes on Olive Oil Quality and Composition of Coratina Cultivar Olives Grown on Karst Soil in Croatia · 2022
Opposite direction
no effect
Irrigation treatments did not affect lipid content and composition, phenolic compounds, or organoleptic characteristics of olive fruit.
THE EFFECT OF IRRIGATION MANAGEMENT ON PLANT PERFORMANCE AND OIL QUALITY OF TWO OLIVE CVS. GROWN IN A TYPICAL ENVIRONMENT OF SOUTHERN ITALY · 2008
Opposite direction
negative
Oil from FI trees had lower total phenols.
EFFECT OF DIFFERENT IRRIGATION REGIMES ON OLIVE TREE (OLEA EUROPAEA L., 'KORONEIKI') PHYSIOLOGY, YIELD AND FRUIT QUALITY · 2011 · compared with treatments
Opposite direction
positive
RDI increased oil polyphenol concentration at all picking dates.
Influence of regulated deficit irrigation strategies applied to olive trees (Arbequina cultivar) on oil yield and oil composition during the fruit ripening period · 2000
Same direction
positive
Regulated deficit irrigation improved total polyphenols in olive.
Ripening Indices, Olive Yield and Oil Quality in Response to Irrigation With Saline Reclaimed Water and Deficit Strategies · 2019
Same direction

9 papers more in this group

See all 18 papers →

Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.

Other papers on the same question

fertilization · quality: phytochemicals · Olea europaea (common olive)Positive and negative results

irrigation · quality: phytochemicals · Olea europaea (common olive)Positive and negative results