Abstract
In Egypt’s arid and semi-arid lands where the main olive production zone is located, evapotranspiration is higher than rainfall during winter. Limited research has used nanomaterials, especially nano-silicon (nSi) to improve the growth, development, and productivity of drought-stressed fruit trees, amid the global water scarcity problem. To assess the role of nSi on drought-sensitive ‘Kalamata’ olive tree growth, and biochemical and physiological changes under drought conditions, a split-plot experiment was conducted in a randomized complete block design. The trees were foliar sprayed with nSi in the field using nine treatments (three replicates each) of 0, 150, and 200 mg·L−1 under different irrigation regimes (100, 90, and 80% irrigation water requirements ‘IWR’) during the 2020 and 2021 seasons. Drought negatively affected the trees, but both concentrations of nSi alleviated drought effects at reduced irrigation levels, compared to the non-stressed trees. Foliar spray of both concentrations of nSi at a moderate level (90% IWR) of drought resulted in improved yield and fruit weight and reduced fruit drop percentage, compared to 80% IWR. In addition, there were reduced levels of osmoprotectants such as proline, soluble sugars, and abscisic acid (ABA) with less membrane damage expressed as reduced levels of malondialdehyde (MDA), H2O2 and electrolyte leakage at 90% compared to 80% IWR. These results suggest that ‘Kalamata’ olive trees were severely stressed at 80% compared to 90% IWR, which was not surprising as it is classified as drought sensitive. Overall, the application of 200 mg·L−1 nSi was beneficial for the improvement of the mechanical resistance, growth, and productivity of moderately-stressed (90% IWR) ‘Kalamata’ olive trees under the Egyptian semi-arid conditions.
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 7
Claim · model-written summary
Drought negatively affected Kalamata olive trees.
- Taxon
- olive
Olea europaeae0 - Material
- ‘Kalamata’e0
- Treatment
- Droughte1
- Outcome
- treese1
- Direction
- negatively affectede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought-sensitive ‘Kalamata’ olive tree growth”
e1“Drought negatively affected the trees”
Claim · model-written summary
Both nano-silicon concentrations alleviated drought effects on Kalamata olive trees at reduced irrigation levels compared with non-stressed trees.
- Taxon
- oliveOlea europaeae0
- Material
- ‘Kalamata’e0
- Treatment
- nSie2
- Outcome
- drought effectse2
- Direction
- alleviatede2
- Comparator
- non-stressed treese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought-sensitive ‘Kalamata’ olive tree growth”
e2“both concentrations of nSi alleviated drought effects at reduced irrigation levels, compared to the non-stressed trees”
Claim · model-written summary
Foliar nano-silicon at 90% IWR improved yield and fruit weight of Kalamata olive trees compared with 80% IWR.
- Taxon
- oliveOlea europaeae0
- Material
- ‘Kalamata’e0
- Treatment
- Foliar spray of both concentrations of nSi at a moderate level (90% IWR) of droughte3
- Outcome
- yield and fruit weighte3
- Direction
- improvede3
- Comparator
- 80% IWRe4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought-sensitive ‘Kalamata’ olive tree growth”
e3“Foliar spray of both concentrations of nSi at a moderate level (90% IWR) of drought resulted in improved yield and fruit weight”
e4“reduced fruit drop percentage, compared to 80% IWR”
Claim · model-written summary
Foliar nano-silicon at 90% IWR reduced fruit drop percentage of Kalamata olive trees compared with 80% IWR.
- Taxon
- oliveOlea europaeae0
- Material
- ‘Kalamata’e0
- Treatment
- Foliar spray of both concentrations of nSi at a moderate level (90% IWR) of droughte3
- Outcome
- fruit drop percentagee4
- Direction
- reducede4
- Comparator
- 80% IWRe4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought-sensitive ‘Kalamata’ olive tree growth”
e3“Foliar spray of both concentrations of nSi at a moderate level (90% IWR) of drought resulted in improved yield and fruit weight”
e4“reduced fruit drop percentage, compared to 80% IWR”
Claim · model-written summary
At 90% IWR, Kalamata olive trees had reduced levels of osmoprotectants (proline, soluble sugars and ABA) compared with 80% IWR.
- Taxon
- oliveOlea europaeae0
- Material
- ‘Kalamata’e0
- Treatment
- 90% IWRe3
- Outcome
- osmoprotectantse5
- Direction
- reducede5
- Qualifier
- proline, soluble sugars, and abscisic acid (ABA)e5
- Comparator
- 80% IWRe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought-sensitive ‘Kalamata’ olive tree growth”
e3“Foliar spray of both concentrations of nSi at a moderate level (90% IWR) of drought resulted in improved yield and fruit weight”
e5“reduced levels of osmoprotectants such as proline, soluble sugars, and abscisic acid (ABA)”
e6“electrolyte leakage at 90% compared to 80% IWR”
Claim · model-written summary
At 90% IWR, Kalamata olive trees had reduced malondialdehyde (MDA), H2O2 and electrolyte leakage compared with 80% IWR.
- Taxon
- oliveOlea europaeae0
- Material
- ‘Kalamata’e0
- Treatment
- 90% IWRe3
- Outcome
- malondialdehyde (MDA), H2O2 and electrolyte leakagee7
- Direction
- reducede7
- Comparator
- 80% IWRe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought-sensitive ‘Kalamata’ olive tree growth”
e3“Foliar spray of both concentrations of nSi at a moderate level (90% IWR) of drought resulted in improved yield and fruit weight”
e6“electrolyte leakage at 90% compared to 80% IWR”
e7“reduced levels of malondialdehyde (MDA), H2O2 and electrolyte leakage”
Claim · model-written summary
Application of 200 mg·L−1 nSi increased mechanical resistance, growth and productivity of moderately stressed Kalamata olive trees under Egyptian semi-arid conditions.
- Taxon
- oliveOlea europaeae0
- Material
- ‘Kalamata’e0
- Treatment
- 200 mg·L−1 nSie1
- Outcome
- mechanical resistance, growth, and productivitye1
- Direction
- increaseinferrede1
- Setting
- Egyptian semi-arid conditionse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought-sensitive ‘Kalamata’ olive tree growth”
e1“the application of 200 mg·L−1 nSi was beneficial for the improvement of the mechanical resistance, growth, and productivity of moderately-stressed (90% IWR) ‘Kalamata’ olive trees under the Egyptian semi-arid conditions”
The same questions in other papers
drought · yield · Olea europaea (common olive)Results differ
1 paper in the same direction as this paper · 10 in the opposite direction
- negative
- negative
- negative
8 papers more in this group
See all 12 papers →application · yield · Olea europaea (common olive)Positive and negative results
34 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
32 papers more in this group
See all 36 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.