Abstract
Traditional olive orchards are usually not irrigated in the Mediterranean basin, but at those latitudes, the yearly rainfall is frequently insufficient to support equilibrated vegetative growth and high fruit and oil production. This three-year field study investigated the effect of complementary irrigation on olive tree vegetative growth, fruit and oil yield during a biennial alternate bearing cycle in a traditional grove under semi-arid conditions. Adult olive trees (Olea europaea L. cv. Nabali Baladi) were subjected to complementary irrigation in 2011 and 2012 ('on' and 'off' years, respectively) with 6, 10, 15 or 20 m3 of water per tree per season, which corresponded to 14.2%, 23.8%, 35.7% and 47.6% of the whole seasonal evapotranspiration (42 m3 of water per year), respectively. Rain-fed trees were used as control. In 2013, no complementary irrigation was supplied, and any residual effects on the yield components were determined. Results showed that none of the irrigation regimes affected vegetative growth, or olive fruit size (mesocarp and endocarp), as fresh and dry weights. The fruit and oil yield per tree increased compared to the rain-fed conditions only when the threshold of 15 m3 was exceeded, thus inducing a higher crop load compared to the rain-fed control during the 'off' and even further during the 'on' year. No residual effects were registered in 2013. The study showed that complementary irrigation of at least 35% of the seasonal water requirement can produce remarkable positive effects on fruit yield especially during 'on' bearing years.
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Claims 7
Claim · model-written summary
Irrigation regimes did not affect olive vegetative growth.
- Taxon
- olive
Olea europaeae0 - Treatment
- irrigation regimese0
- Outcome
- vegetative growthe0
- Direction
- none of the irrigation regimes affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“none of the irrigation regimes affected vegetative growth, or olive fruit size (mesocarp and endocarp), as fresh and dry weights.”
Claim · model-written summary
Irrigation regimes did not affect olive fruit mesocarp and endocarp size as fresh and dry weights.
- Taxon
- oliveOlea europaeae0
- Treatment
- irrigation regimese0
- Outcome
- olive fruit size (mesocarp and endocarp), as fresh and dry weightse0
- Direction
- none of the irrigation regimes affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“none of the irrigation regimes affected vegetative growth, or olive fruit size (mesocarp and endocarp), as fresh and dry weights.”
Claim · model-written summary
Fruit yield per tree increased relative to rain-fed trees only above 15 m3 irrigation.
- Taxon
- oliveOlea europaeat0
- Treatment
- threshold of 15 m3 was exceedede0
- Outcome
- fruit and oil yield per treee0
- Direction
- increasede0
- Comparator
- rain-fed conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The fruit and oil yield per tree increased compared to the rain-fed conditions only when the threshold of 15 m3 was exceeded”
t0“olive”
Claim · model-written summary
Oil yield per tree increased relative to rain-fed trees only above 15 m3 irrigation.
- Taxon
- oliveOlea europaeat0
- Treatment
- threshold of 15 m3 was exceedede0
- Outcome
- oil yield per treee0
- Direction
- increasede0
- Comparator
- rain-fed conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The fruit and oil yield per tree increased compared to the rain-fed conditions only when the threshold of 15 m3 was exceeded”
t0“olive”
Claim · model-written summary
Irrigation above the threshold increased crop load relative to rain-fed trees in off and on years.
- Taxon
- oliveOlea europaeat0
- Treatment
- complementary irrigationt1
- Outcome
- crop loade0
- Direction
- highere0
- Qualifier
- during the 'off' and even further during the 'on' yeare0
- Comparator
- rain-fed controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“thus inducing a higher crop load compared to the rain-fed control during the 'off' and even further during the 'on' year.”
t0“olive”
t1“complementary irrigation”
Claim · model-written summary
There were no residual irrigation effects on yield components in 2013.
- Taxon
- oliveOlea europaeat0
- Treatment
- complementary irrigationt1
- Outcome
- residual effectse0
- Direction
- No residual effectse0
- Qualifier
- 2013e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No residual effects were registered in 2013.”
t0“olive”
t1“complementary irrigation”
Claim · model-written summary
The authors conclude irrigation of at least 35% of seasonal water requirement can positively affect fruit yield, especially in on years.
- Taxon
- oliveOlea europaeat0
- Outcome
- complementary irrigation of at least 35% of the seasonal water requiremente0
- Qualifier
- especially during 'on' bearing yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“complementary irrigation of at least 35% of the seasonal water requirement can produce remarkable positive effects on fruit yield especially during 'on' bearing years.”
t0“olive”
The same questions in other papers
irrigation · growth · Olea europaea (common olive)Results differ
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See all 53 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.