Abstract
In 2019–2020, trials were carried out in both intensive (cultivar Moraiolo) and super-high-density (cultivar Sikitita) young olive orchards to drastically reduce early production and, consequently, accelerate tree growth. Different concentrations of naphthaleneacetic acid (NAA) (0 ppm–control, 20 ppm, 40 ppm, 80 ppm, 160 ppm and 250 ppm) were applied at full bloom (open flowers > 80%), using a shoulder sprayer, and their effects on vegetative growth and reproductive behavior were evaluated, also compared to manually deflowered trees. The treatments with NAA reduced fruit set (down to values close to zero) compared to the control, and the reduction was correlated with the NAA concentration. In particular, 160 ppm virtually eliminated fruit set and thus production in both Moraiolo and Sikitita cultivars. In Moraiolo, 160 ppm NAA and manual deflowering determined similar shoot and trunk growths, which were greater than in control trees. Application of 160 ppm NAA for two consecutive years gave a progressively higher increase in trunk growth compared to the control. In conclusion, in young olive trees, the treatment with 160 ppm NAA at full bloom practically eliminated fruit set and production, with a parallel great increase in vegetative growth. This can be exploited as a powerful technique to accelerate the growth of young olive trees in both intensive and super-high-density orchards, as well as in nurseries. A more rapid transition to the adult stage/size of the trees and to full production of the orchard allows us to anticipate the use of mechanical harvesting and the recovery of the planting investment.
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Claims 6
Claim · model-written summary
NAA reduced fruit set relative to control, increasingly with concentration.
- Taxon
- Olive
Olea europaeat0 - Treatment
- NAAe0
- Outcome
- fruit sete0
- Direction
- reducede0
- Qualifier
- down to values close to zeroe0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The treatments with NAA reduced fruit set (down to values close to zero) compared to the control, and the reduction was correlated with the NAA concentration”
t0“Olive”
Claim · model-written summary
160 ppm NAA virtually eliminated fruit set and production in Moraiolo.
- Taxon
- OliveOlea europaeat0
- Material
- Moraioloe0
- Treatment
- 160 ppme0
- Outcome
- fruit set and thus productione0
- Direction
- virtually eliminatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“160 ppm virtually eliminated fruit set and thus production in both Moraiolo and Sikitita cultivars”
t0“Olive”
Claim · model-written summary
160 ppm NAA virtually eliminated fruit set and production in Sikitita.
- Taxon
- OliveOlea europaeat0
- Material
- Sikititae0
- Treatment
- 160 ppme0
- Outcome
- fruit set and thus productione0
- Direction
- virtually eliminatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“160 ppm virtually eliminated fruit set and thus production in both Moraiolo and Sikitita cultivars”
t0“Olive”
Claim · model-written summary
In Moraiolo, 160 ppm NAA and manual deflowering produced similar shoot and trunk growth, both above control.
- Taxon
- OliveOlea europaeat0
- Material
- Moraioloe0
- Treatment
- 160 ppm NAAe0
- Outcome
- shoot and trunk growthse0
- Direction
- similare0
- Qualifier
- greater than in control treese0
- Comparator
- manual defloweringe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Moraiolo, 160 ppm NAA and manual deflowering determined similar shoot and trunk growths, which were greater than in control trees”
t0“Olive”
Claim · model-written summary
Two consecutive years of 160 ppm NAA progressively increased trunk growth over control.
- Taxon
- OliveOlea europaeat0
- Treatment
- 160 ppm NAA for two consecutive yearse0
- Outcome
- trunk growthe0
- Direction
- progressively higher increasee0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 160 ppm NAA for two consecutive years gave a progressively higher increase in trunk growth compared to the control”
t0“Olive”
Claim · model-written summary
Authors propose 160 ppm NAA at bloom to accelerate young olive tree growth in orchards and nurseries.
- Taxon
- olive treesOlea europaeae0
- Outcome
- accelerate the growth of young olive treese0
- Setting
- intensive and super-high-density orchardse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This can be exploited as a powerful technique to accelerate the growth of young olive trees in both intensive and super-high-density orchards, as well as in nurseries”
t0“Olive”
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