Abstract
Background: Several studies have investigated the possibility of using nutrients supplied as fertilizers to improve yield, firmness or final olive fruit size, however, scarce are the studies about the effect of pre-harvest foliar calcium application rate on mineral, quality and phytochemical composition of olive oils, which is the main goal of this investigation. Methods: For this study, an organic calcium compound (at two rates: 20 g/tree and 40 g/tree) and control (water) were applied to olive trees of three different cultivars (Cobrançosa, Galega, and Picual) at three different moments in a certified olive orchard in Portugal. At the commercial maturity, the olive fruits were harvested and processed to obtain the monovarietal olive oils. Results: The calcium application did not reveal significant changes on the quality parameters of the monovarietal olive oils, remaining extra virgin olive oils, however, the analysis of Ca mineral content revealed a significant increase of this content for some olive oil cultivars. Furthermore, some phenolic compounds concentration of olive oils were improved with the Ca foliar application, in opposite of antioxidant activity that was negatively affected. Conclusions: This investigation comes to demonstrate the cultivar effect on the final phytochemical composition, as well as the effect that Ca mineral content effect on the biosynthesis of bioactive compounds.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. 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
Calcium application did not significantly change monovarietal olive oil quality parameters.
- Taxon
- olive trees
Olea europaeae1 - Treatment
- calcium applicatione0
- Outcome
- quality parameters of the monovarietal olive oilse0
- Direction
- did not reveal significant changese0
- Comparator
- control (water)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The calcium application did not reveal significant changes on the quality parameters of the monovarietal olive oils, remaining extra virgin olive oils”
e1“control (water) were applied to olive trees”
t0“Olive Oils”
Claim · model-written summary
Calcium application significantly increased calcium content in oils from some cultivars.
- Taxon
- olive treesOlea europaeae2
- Treatment
- calcium applicatione1
- Outcome
- Ca mineral contente0
- Direction
- increasee0
- Qualifier
- some olive oil cultivarse0
- Comparator
- control (water)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the analysis of Ca mineral content revealed a significant increase of this content for some olive oil cultivars”
e1“The calcium application did not reveal significant changes”
e2“control (water) were applied to olive trees”
Claim · model-written summary
Foliar calcium improved concentrations of some olive oil phenolic compounds.
- Taxon
- olive treesOlea europaeae1
- Treatment
- Ca foliar applicatione0
- Outcome
- phenolic compounds concentration of olive oilse0
- Direction
- improvede0
- Comparator
- control (water)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“some phenolic compounds concentration of olive oils were improved with the Ca foliar application”
e1“control (water) were applied to olive trees”
Claim · model-written summary
Foliar calcium negatively affected olive oil antioxidant activity.
- Taxon
- olive treesOlea europaeae2
- Treatment
- Ca foliar applicatione1
- Outcome
- antioxidant activitye0
- Direction
- negatively affectede0
- Comparator
- control (water)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“antioxidant activity that was negatively affected”
e1“with the Ca foliar application”
e2“control (water) were applied to olive trees”
Claim · model-written summary
Olive cultivar affected final phytochemical composition.
- Taxon
- olive treesOlea europaeae1
- Material
- three different cultivarse1
- Outcome
- final phytochemical compositione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the cultivar effect on the final phytochemical composition”
e1“olive trees of three different cultivars”
Claim · model-written summary
The authors infer an effect of calcium mineral content on bioactive compound biosynthesis.
- Taxon
- olive treesOlea europaeae1
- Compound
- Ca mineral contente0
- Outcome
- biosynthesis of bioactive compoundse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect that Ca mineral content effect on the biosynthesis of bioactive compounds”
e1“olive trees of three different cultivars”
The same questions in other papers
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
- negative
- negative
- 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.