Abstract
Abstract In Morocco, olive yields and oil quality are still low compared to the potential of the crop because olive is usually produced in poor soil and most groves are under rainfed conditions. Most of olive orchards suffer from major macronutrients NPK (nitrogen, potassium, and phosphorus) deficiency. The aim of this study is to evaluate the impact of foliar fertilization of N, P and K nutrients and harvest stage on olive fruit yield, fruit characteristics and olive oil composition. The fertilization treatments are a combination of nutrients N, P and k applied as a foliar spray: T1(N), T2(P), T3(K), T4(N+P), T5(N+K), T6(P+K), T7(N+P+K) compared to control T0 (without NPK). A total of six foliar sprays were applied, one per month, from February to July. Olive samples were harvested in 2 dates (S1: September, S2: October). Results showed that fruit maturity index increased with harvesting period. The foliar fertilization with N, P and K separately increase the olive fruit yield significantly to 16.7 Kg/tree, 16.3 Kg/tree and 15 Kg/tree respectively, compared to control 11.7 Kg/tree. The combination of these 3 nutrients (NPK) significantly maximize the olive fruit yield 26.7 Kg/tree. Except oil acidity, we noted significant changes in olive oil phenols content, oil fatty acids composition. Nevertheless, values obtained for all quality parameters studied were conform to IOC International Olive Council (IOC) norms. Suggesting that any single deficient nutrient limit olive yield potential and oil quality. Nutrient synergy is more critical to enhance high olive yield and oil quality.
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 11
Claim · model-written summary
Fruit maturity index increased with later harvest.
- Taxon
- olive
Olea europaeat0 - Outcome
- fruit maturity indexe0
- Direction
- increasede0
- Setting
- harvesting periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fruit maturity index increased with harvesting period”
t0“olive”
Claim · model-written summary
Foliar N increased fruit yield to 16.7 Kg/tree, compared with 11.7 Kg/tree in controls.
- Taxon
- oliveOlea europaeae0
- Treatment
- Ne0
- Outcome
- olive fruit yielde0
- Direction
- increasee0
- Value
- 16.7 Kg/treee0
- Qualifier
- 11.7 Kg/treee0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The foliar fertilization with N, P and K separately increase the olive fruit yield significantly to 16.7 Kg/tree, 16.3 Kg/tree and 15 Kg/tree respectively, compared to control 11.7 Kg/tree”
t0“olive”
Claim · model-written summary
Foliar P increased fruit yield to 16.3 Kg/tree, compared with 11.7 Kg/tree in controls.
- Taxon
- oliveOlea europaeae0
- Treatment
- Pe0
- Outcome
- olive fruit yielde0
- Direction
- increasee0
- Value
- 16.3 Kg/treee0
- Qualifier
- 11.7 Kg/treee0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The foliar fertilization with N, P and K separately increase the olive fruit yield significantly to 16.7 Kg/tree, 16.3 Kg/tree and 15 Kg/tree respectively, compared to control 11.7 Kg/tree”
t0“olive”
Claim · model-written summary
Foliar K increased fruit yield to 15 Kg/tree, compared with 11.7 Kg/tree in controls.
- Taxon
- oliveOlea europaeae0
- Treatment
- Ke0
- Outcome
- olive fruit yielde0
- Direction
- increasee0
- Value
- 15 Kg/treee0
- Qualifier
- 11.7 Kg/treee0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The foliar fertilization with N, P and K separately increase the olive fruit yield significantly to 16.7 Kg/tree, 16.3 Kg/tree and 15 Kg/tree respectively, compared to control 11.7 Kg/tree”
t0“olive”
Claim · model-written summary
Combined NPK maximized fruit yield at 26.7 Kg/tree.
- Taxon
- oliveOlea europaeae0
- Treatment
- NPKe0
- Outcome
- olive fruit yielde0
- Direction
- maximizee0
- Value
- 26.7 Kg/treee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combination of these 3 nutrients (NPK) significantly maximize the olive fruit yield 26.7 Kg/tree”
t0“olive”
Claim · model-written summary
Olive oil phenols content changed significantly with the treatments.
- Taxon
- oliveOlea europaeat0
- Outcome
- olive oil phenols contente0
- Direction
- changese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Except oil acidity, we noted significant changes in olive oil phenols content, oil fatty acids composition”
t0“olive”
Claim · model-written summary
Olive oil fatty acid composition changed significantly with the treatments.
- Taxon
- oliveOlea europaeat0
- Outcome
- oil fatty acids compositione0
- Direction
- changese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Except oil acidity, we noted significant changes in olive oil phenols content, oil fatty acids composition”
t0“olive”
Claim · model-written summary
Olive oil acidity did not change significantly.
- Taxon
- oliveOlea europaeat0
- Outcome
- oil aciditye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Except oil acidity, we noted significant changes in olive oil phenols content, oil fatty acids composition”
t0“olive”
Claim · model-written summary
All studied quality parameters met IOC norms.
- Taxon
- oliveOlea europaeat0
- Outcome
- quality parameters studiede0
- Comparator
- IOC International Olive Council (IOC) normse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“values obtained for all quality parameters studied were conform to IOC International Olive Council (IOC) norms”
t0“olive”
Claim · model-written summary
The authors inferred that deficiency of any one nutrient limits olive yield potential and oil quality.
- Taxon
- oliveOlea europaeae0
- Outcome
- olive yield potential and oil qualitye0
- Qualifier
- any single deficient nutriente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Suggesting that any single deficient nutrient limit olive yield potential and oil quality”
Claim · model-written summary
The authors concluded that nutrient synergy is critical to improve olive yield and oil quality.
- Taxon
- oliveOlea europaeae0
- Outcome
- Nutrient synergy is more critical to enhance high olive yield and oil qualitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nutrient synergy is more critical to enhance high olive yield and oil quality”
The same questions in other papers
phosphorus · yield · Olea europaea (common olive)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
potassium · yield · Olea europaea (common olive)Positive and negative results
6 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- positive
5 papers more in this group
See all 9 papers →nitrogen · yield · Olea europaea (common olive)Positive and negative results
6 papers in the same direction as this paper · 3 in the opposite direction
- negative
- negative
- negative
6 papers more in this group
See all 10 papers →fertilization · yield · Olea europaea (common olive)Positive and negative results
33 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- negative
34 papers more in this group
See all 38 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.