Abstract
BACKGROUND: This work was conducted to determine the effects of two nutrient-based fertilisers on the general physicochemical characteristics (including free fatty acid content, peroxide value and UV spectrophotometric characteristics), fatty acid profile, total phenols, o-diphenols and phytosterol composition of olive oil. Foliar applications were carried out in two successive years and included four treatments: TC (control, without foliar nutrition), T1 (rich in nitrogen, applied at the start of vegetation, 10 days later and 20 days later), T2 (rich in boron, magnesium, sulfur and manganese, applied at the beginning of flowering and 10 days later) and T3 (T1+T2). At the end of the experiment (after 2 years), oils were extracted and analysed. RESULTS: No effect was found on either general physicochemical characteristics or fatty acid composition. Foliar fertilisation caused a significant decrease in both polyphenol and o-diphenol contents. Total sterol content was unaffected by foliar fertilisation. However, the phytosterol composition of the oil, particularly its β-sitosterol level, was markedly improved after foliar nutrient application. Principal component analysis of the phytosterol composition showed discrimination between the control oil and the oils from T1, T2 and T3 treatments. CONCLUSION: The results of this study extend the current knowledge of such cross-talk between plant nutrition and quality of oil.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 6
Claim · model-written summary
Foliar nutrient applications had no effect on the general physicochemical characteristics of olive oil.
- Taxon
- olive trees
Olea europaeat0 - Treatment
- Foliar applicationse0
- Outcome
- general physicochemical characteristicse5
- Direction
- No effecte5
- Comparator
- control, without foliar nutritione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“fertilisers of olive trees”
e0“Foliar applications were carried out in two successive years and included four treatments”
e1“TC (control, without foliar nutrition)”
e5“No effect was found on either general physicochemical characteristics or fatty acid composition”
Claim · model-written summary
Foliar nutrient applications had no effect on the fatty acid composition of olive oil.
- Taxon
- olive treesOlea europaeat0
- Treatment
- Foliar applicationse0
- Outcome
- fatty acid compositione5
- Direction
- No effecte5
- Comparator
- control, without foliar nutritione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“fertilisers of olive trees”
e0“Foliar applications were carried out in two successive years and included four treatments”
e1“TC (control, without foliar nutrition)”
e5“No effect was found on either general physicochemical characteristics or fatty acid composition”
Claim · model-written summary
Foliar fertilisation significantly decreased polyphenol and o-diphenol contents of olive oil.
- Taxon
- olive treesOlea europaeat0
- Treatment
- Foliar fertilisatione2
- Outcome
- polyphenol and o-diphenol contentse2
- Direction
- decreasee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“fertilisers of olive trees”
e2“Foliar fertilisation caused a significant decrease in both polyphenol and o-diphenol contents”
Claim · model-written summary
Foliar fertilisation had no effect on the total sterol content of olive oil.
- Taxon
- olive treesOlea europaeat0
- Treatment
- Foliar fertilisatione3
- Outcome
- Total sterol contente3
- Direction
- unaffectede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“fertilisers of olive trees”
e3“Total sterol content was unaffected by foliar fertilisation”
Claim · model-written summary
Foliar nutrient application markedly improved the phytosterol composition of olive oil, particularly its β-sitosterol level, relative to the control.
- Taxon
- olive treesOlea europaeat0
- Treatment
- foliar nutrient applicatione4
- Outcome
- phytosterol compositione4
- Direction
- markedly improvede4
- Qualifier
- particularly its β-sitosterol levele4
- Comparator
- control, without foliar nutritione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“fertilisers of olive trees”
e1“TC (control, without foliar nutrition)”
e4“the phytosterol composition of the oil, particularly its β-sitosterol level, was markedly improved after foliar nutrient application”
Claim · model-written summary
Principal component analysis of phytosterol composition separated the control oil from the oils of treatments T1, T2 and T3.
- Taxon
- olive treesOlea europaeat0
- Treatment
- T1, T2 and T3 treatmentse6
- Outcome
- phytosterol compositione6
- Comparator
- control oile6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“fertilisers of olive trees”
e6“Principal component analysis of the phytosterol composition showed discrimination between the control oil and the oils from T1, T2 and T3 treatments”
The same questions in other papers
fertilization · quality: general · Olea europaea (common olive)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- positive
application · quality: phytochemicals · Olea europaea (common olive)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
fertilization · quality: phytochemicals · Olea europaea (common olive)Positive and negative results
2 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
3 papers more in this group
See all 7 papers →fertilization · molecular: metabolites · Olea europaea (common olive)Positive and negative results
2 papers in the same direction as this paper · 5 in the opposite direction
- no effect
- positive
- positive
4 papers more in this group
See all 8 papers →application · quality: oil · Olea europaea (common olive)Positive and negative results
2 papers in the same direction as this paper · 9 in the opposite direction
- positive
- positive
- positive
8 papers more in this group
See all 12 papers →application · molecular: metabolites · Olea europaea (common olive)Positive and negative results
2 papers in the same direction as this paper · 9 in the opposite direction
- positive
- positive
- positive
8 papers more in this group
See all 12 papers →application · quality: general · Olea europaea (common olive)Results agree
1 paper in the same direction as this paper
- positive
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.