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“yield decrease”

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1990 2000 ’10 ’20

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Organism: Olea europaea ✕

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Regulated deficit irrigation did not decrease olive fruit yield.

Taxon: olive treesOlea europaeae0
Treatment: RDI strategye3
Outcome: fruit yielde3
Direction: did not decreasee3
Comparator: full irrigatione6

Verbatim

e3
“The RDI strategy did not decrease the fruit yield despite the fact that olive weight tended to decrease, and it increased the oil yield by ~14.5%”
✓ located verbatim in the source · abstract, characters 933–1078

e6
“full irrigation (FI, 100% of ETc)”
✓ located verbatim in the source · abstract, characters 414–447

e0
“olive trees cv Arbosana”
✓ located verbatim in the source · abstract, characters 562–585

Title

Ripening Indices, Olive Yield and Oil Quality in Response to Irrigation With Saline Reclaimed Water and Deficit Strategies

Cristina Romero-Trigueros; Gaetano Alessandro Vivaldi; Emilio Nicolás Nicolás; et al. Frontiers in Plant Science 2019. doi:10.3389/fpls.2019.01243

Other claims from this paper (17)

Intervention effect Reclaimed water without water restriction increased olive fruit yield by 35% compared with control trees.
Intervention effect Reclaimed water without water restriction did not result in higher olive oil yield.
Intervention effect Regulated deficit irrigation tended to decrease olive weight.
Intervention effect Regulated deficit irrigation increased olive oil yield by about 14.5%.
Intervention effect Combined reclaimed water and deficit irrigation did not decrease olive fruit yield.
Intervention effect Combined reclaimed water and deficit irrigation significantly reduced olive oil yield by 25% in 2018.
Intervention effect Combined reclaimed water and deficit irrigation strongly reduced oil content per fruit dry weight by 40%.
Intervention effect Both RDI treatments lowered acidity levels in olive paste compared with full irrigation treatments.
Intervention effect Both RDI treatments reduced oil extractability and fatty yield.
Intervention effect Reclaimed water exposure decreased olive oil quality.
Intervention effect Reclaimed water exposure reduced oleic acid in olive oil.
Intervention effect Reclaimed water exposure increased the C18:2/C18:3 ratio in olive oil.
Intervention effect Reclaimed water exposure increased peroxides in olive oil.
Intervention effect Reclaimed water improved total polyphenols in olive.
Intervention effect Regulated deficit irrigation improved total polyphenols in olive.
Observation In all cases the olive oil parameters met the legislation.
Recommendation Reclaimed water and regulated deficit irrigation have potential to manage olive oil production.

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Intercropping did not decrease olive tree yield compared with olive monoculture.

Taxon: olive treeOlea europaeae0
Treatment: all intercropping cropse0
Outcome: olive tree yielde0
Direction: did not decreasee0
Comparator: monoculturee0

Verbatim

e0
“The results showed that all intercropping crops did not decrease the olive tree yield compared to the olive tree in monoculture”
✓ located verbatim in the source · abstract, characters 953–1080

Title

The effect of intercropping crop type on soil fertility, olive trees productivity and quality in Moroccan agroforestry systems

Inass Zayani; Mohammed Ammari; Laïla Ben Allal; et al. Vegetos 2025. doi:10.1007/s42535-024-01132-7

Other claims from this paper (4)

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Combined reclaimed water and deficit irrigation did not decrease olive fruit yield.

Taxon: olive treesOlea europaeae0
Treatment: combination of both stresses (RW and RDI)e4
Outcome: fruit yielde4
Direction: neither did decreasee4
Comparator: control treese1

Verbatim

e4
“The combination of both stresses (RW and RDI) neither did decrease the fruit yield; however, it significantly reduced oil yield (25% less in 2018)”
✓ located verbatim in the source · abstract, characters 1080–1226

e1
“RW without water restrictions increased the fruit yield by 35% due to a slight increase in the fruit weight and, mainly, to a greater fruit set than the control trees”
✓ located verbatim in the source · abstract, characters 647–813

e0
“olive trees cv Arbosana”
✓ located verbatim in the source · abstract, characters 562–585

Title

Ripening Indices, Olive Yield and Oil Quality in Response to Irrigation With Saline Reclaimed Water and Deficit Strategies

Cristina Romero-Trigueros; Gaetano Alessandro Vivaldi; Emilio Nicolás Nicolás; et al. Frontiers in Plant Science 2019. doi:10.3389/fpls.2019.01243

Other claims from this paper (17)

Intervention effect Reclaimed water without water restriction increased olive fruit yield by 35% compared with control trees.
Intervention effect Reclaimed water without water restriction did not result in higher olive oil yield.
Intervention effect Regulated deficit irrigation did not decrease olive fruit yield.
Intervention effect Regulated deficit irrigation tended to decrease olive weight.
Intervention effect Regulated deficit irrigation increased olive oil yield by about 14.5%.
Intervention effect Combined reclaimed water and deficit irrigation significantly reduced olive oil yield by 25% in 2018.
Intervention effect Combined reclaimed water and deficit irrigation strongly reduced oil content per fruit dry weight by 40%.
Intervention effect Both RDI treatments lowered acidity levels in olive paste compared with full irrigation treatments.
Intervention effect Both RDI treatments reduced oil extractability and fatty yield.
Intervention effect Reclaimed water exposure decreased olive oil quality.
Intervention effect Reclaimed water exposure reduced oleic acid in olive oil.
Intervention effect Reclaimed water exposure increased the C18:2/C18:3 ratio in olive oil.
Intervention effect Reclaimed water exposure increased peroxides in olive oil.
Intervention effect Reclaimed water improved total polyphenols in olive.
Intervention effect Regulated deficit irrigation improved total polyphenols in olive.
Observation In all cases the olive oil parameters met the legislation.
Recommendation Reclaimed water and regulated deficit irrigation have potential to manage olive oil production.

Associationobservedoriginal resultno effectmeasured

Claim · model-written summary

The polyphenol decrease did not affect organoleptic oil quality or shelf-life.

Taxon: oliveOlea europaeat0
Compound: polyphenolse0
Outcome: oil quality in terms of organoleptic parameters or oil shelf-lifee0
Direction: did not influencee0
Qualifier: decrease of polyphenolse0

Verbatim

e0
“The decrease of polyphenols did not influence the oil quality in terms of organoleptic parameters or oil shelf-life”
✓ located verbatim in the source · abstract, characters 1692–1807

t0
“olive (Olea europaeaL.)”
✓ located verbatim in the source · title, characters 73–96

Title

Yield and oil quality of intensively trained trees of three cultivars of olive (Olea europaeaL.) under different irrigation regimes

M. Patumi; R. D’Andria; G. Fontanazza; et al. The Journal of Horticultural Science and Biotechnology 1999. doi:10.1080/14620316.1999.11511180

Other claims from this paper (12)

Observation T3 soil water stayed near field capacity and did not differ from T2.
Observation Soil moisture decreased during summer under T0 and T1, reaching 20.8% in T0 on 12 August before rainfall restored field capacity.
Intervention effect Irrigated olive leaves had higher relative water content than rain-fed controls.
Intervention effect Irrigation increased yield in all olive cultivars compared with rain-fed controls.
Intervention effect T1 increased Nocellara del Belice olive yield by 200% versus rain-fed control.
Intervention effect T2 increased Ascolana tenera olive yield by 233% versus control.
Intervention effect T2 increased Kalamata olive yield by 47% versus control.
Intervention effect Irrigated olives had higher oil yield, mainly because fruit yield increased.
Observation Pulp-stone ratio and fruit triglyceride quantity were similar across irrigation treatments.
Intervention effect Irrigation did not affect olive oil fatty acid composition.
Intervention effect Irrigation decreased olive oil polyphenolic substance content.
Mechanism The authors attribute the polyphenol decrease to water-deficit-related enzymatic activity rather than fruit ripening.

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

GA3 treatment was not effective in reducing fruit amount in the on year.

Taxon: oliveOlea europaeae1
Treatment: $GA_3$ treatmente4
Outcome: decrease of fruit amounte4
Direction: no_changeinferrede4

Not reportedComparator

Verbatim

e1
“100 ppm gibberellic acid ($GA_3$ ) was applied to Memecik olive trees”
✓ located verbatim in the source · abstract, characters 20–89

e4
“While $GA_3$ treatment was not very effective on the decrease of fruit amount in the ‘on’ year, it increased fruit amount in the ‘off ’ year”
✓ located verbatim in the source · abstract, characters 481–621

Title

The effects of GA3 treatment on yield, carbohydrate, and endogenous hormone changes in Memecik olive cultivar

SALİH ÜLGER; SABRİYE ATMACA; SARA DEMİRAL TURKISH JOURNAL OF AGRICULTURE AND FORESTRY 2018. doi:10.3906/tar-1705-76

Other claims from this paper (8)

Intervention effect GA3 on-year yield was 17.33 kg/tree versus 19.33 kg/tree in controls.
Intervention effect GA3 off-year yield was 7.17 kg/tree versus 4.00 kg/tree in controls.
Intervention effect GA3 treatment increased fruit amount in the off year.
Intervention effect GA3 treatment did not significantly affect total reducing sugar amount in olive.
Observation Total reducing sugar amount was determined at the 4% level in both years.
Observation Glucose content was higher than sucrose and fructose in all plant organs and during flower bud formation in olive.
Intervention effect GA3 treatment increased abscisic acid, GA3 and indole-3-acetic acid levels in olive organs and flower bud formation periods.
Intervention effect GA3 treatment increased zeatin levels in olive organs and flower bud formation periods.

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