Abstract
Fertilization practices in Tunisian olive growing are widely used in order to improve the yields and the mineral status of the trees grown under rain-fed conditions (low received rainfall). The aim of this study is to assess the effect of foliar fertilization on mineral composition and primary metabolites (soluble sugars) in leaves and roots of cultivar Chemlali. A nitrogen based fertilizer and two biostimulants were sprayed separately in different seasons and the treatments were the following: F1 (nitrogen based fertilizer), F2 (biostimulant rich in boron), F3 (combination of F1 and F2), F4 (biostimulant with a calcium base) and F5 (Combination of F1, F2 and F4). Untreated trees (no foliar fertilization) were used as control (C). Leaf and root samples of treatments F1, F2 and F3 were collected at different phenological stages while samples of F4 and F5 were collected at fruit growth. Mineral content and carbohydrate composition were carried out in all the samples. Results showed that foliar fertilization generally improved the mineral profile of leaves for both macro and micronutrients. Macronutrient concentrations were more important in leaves than in roots while the micronutrients were the highest in roots. Concerning carbohydrates status, the most abundantly soluble sugar in leaves and roots was mannitol followed by glucose. Differences in carbohydrates concentration were observed in leaves through the season and the treatments. The combined treatment F3 induced a positive effect on the pool of soluble sugars in leaves at flowering. Then, both mannitol and glucose decreased in July compared to the levels in May, a fact which can be explained by the high carbohydrate demand for fruit growth during this period. Roots accumulated lower contents of carbohydrates. The ratios macronutrients/total carbohydrates and micronutrients/total carbohydrates were higher in the roots than in the leaves. All these results showed the impact of foliar fertilization on the mineral and carbohydrate status and highlighted a relationship between them for different organs of the olive tree cultivated under rain-fed 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 13
Claim · model-written summary
Foliar fertilization generally improved leaf macro- and micronutrient profiles.
- Taxon
- olive trees
Olea europaeat0 - Treatment
- foliar fertilizatione0
- Outcome
- mineral profile of leaves for both macro and micronutrientse0
- Direction
- improvede0
- Comparator
- Untreated treese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results showed that foliar fertilization generally improved the mineral profile of leaves for both macro and micronutrients.”
e1“Untreated trees (no foliar fertilization) were used as control (C).”
t0“olive trees”
Claim · model-written summary
Macronutrient concentrations were greater in leaves than roots.
- Taxon
- olive treesOlea europaeat0
- Organ / stage
- leavese0
- Outcome
- Macronutrient concentrationse0
- Direction
- more importante0
- Comparator
- rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Macronutrient concentrations were more important in leaves than in roots”
t0“olive trees”
Claim · model-written summary
Micronutrients were highest in roots.
- Taxon
- olive treesOlea europaeat0
- Organ / stage
- rootse0
- Outcome
- micronutrientse0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the micronutrients were the highest in roots”
t0“olive trees”
Claim · model-written summary
Mannitol was the most abundant soluble sugar in leaves and roots, followed by glucose.
- Taxon
- olive treesOlea europaeat0
- Organ / stage
- leaves and rootse0
- Outcome
- most abundantly soluble sugar in leaves and roots was mannitol followed by glucosee0
- Direction
- most abundantlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the most abundantly soluble sugar in leaves and roots was mannitol followed by glucose”
t0“olive trees”
Claim · model-written summary
Leaf carbohydrate concentrations differed across season and treatments.
- Taxon
- olive treesOlea europaeat0
- Organ / stage
- leavese0
- Treatment
- the treatmentse0
- Outcome
- carbohydrates concentratione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences in carbohydrates concentration were observed in leaves through the season and the treatments.”
t0“olive trees”
Claim · model-written summary
Combined F3 treatment increased the pool of soluble sugars in leaves at flowering.
- Taxon
- olive treesOlea europaeat0
- Organ / stage
- floweringe0
- Treatment
- combined treatment F3e0
- Outcome
- pool of soluble sugars in leavese0
- Direction
- positive effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combined treatment F3 induced a positive effect on the pool of soluble sugars in leaves at flowering.”
e1“F3 (combination of F1 and F2)”
t0“olive trees”
Claim · model-written summary
Mannitol in olive tissues decreased in July relative to May.
Not reportedSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both mannitol and glucose decreased in July compared to the levels in May”
t0“olive trees”
Claim · model-written summary
Glucose in olive tissues decreased in July relative to May.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both mannitol and glucose decreased in July compared to the levels in May”
t0“olive trees”
Claim · model-written summary
Roots accumulated lower carbohydrate contents.
- Taxon
- olive treesOlea europaeat0
- Organ / stage
- Rootse0
- Outcome
- contents of carbohydratese0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Roots accumulated lower contents of carbohydrates.”
t0“olive trees”
Claim · model-written summary
The macronutrient to total carbohydrate ratio was higher in roots than leaves.
- Taxon
- olive treesOlea europaeat0
- Organ / stage
- rootse0
- Outcome
- macronutrients/total carbohydratese0
- Direction
- highere0
- Comparator
- leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ratios macronutrients/total carbohydrates and micronutrients/total carbohydrates were higher in the roots than in the leaves.”
t0“olive trees”
Claim · model-written summary
The micronutrient to total carbohydrate ratio was higher in roots than leaves.
- Taxon
- olive treesOlea europaeat0
- Organ / stage
- rootse0
- Outcome
- micronutrients/total carbohydratese0
- Direction
- highere0
- Comparator
- leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ratios macronutrients/total carbohydrates and micronutrients/total carbohydrates were higher in the roots than in the leaves.”
t0“olive trees”
Claim · model-written summary
The authors associated the July sugar decline with carbohydrate demand for fruit growth.
- Taxon
- olive treesOlea europaeat0
- Organ / stage
- fruit growthe0
- Outcome
- mannitol and glucose decreased in Julye0
- Qualifier
- high carbohydrate demand for fruit growth during this periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both mannitol and glucose decreased in July compared to the levels in May, a fact which can be explained by the high carbohydrate demand for fruit growth during this period”
t0“olive trees”
Claim · model-written summary
Mineral and carbohydrate status were related across olive organs under rain-fed conditions.
- Taxon
- olive treesOlea europaeat0
- Organ / stage
- different organse0
- Outcome
- mineral and carbohydrate statuse1
- Qualifier
- rain-fed conditionse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“highlighted a relationship between them for different organs of the olive tree cultivated under rain-fed conditions”
e1“the mineral and carbohydrate status”
t0“olive trees”
The same questions in other papers
fertilization · molecular: metabolites · Olea europaea (common olive)Positive and negative results
4 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- no effect
- no effect
4 papers more in this group
See all 8 papers →application · molecular: metabolites · Olea europaea (common olive)Positive and negative results
8 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- no effect
- no effect
8 papers more in this group
See all 12 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.