Abstract
Adjusting the crop load of peaches [ Prunus persica (L.) Batsch] by hand thinning is currently required to ensure marketable size of most cultivars grown in Ontario. A novel approach to adjust cropping by inhibiting flowering using gibberellic acid (GA 3 ) was tested in an orchard experiment in which GA 3 was applied at 7, 10, and 13 weeks after full bloom to mature `Redhaven' peach trees. Late GA 3 treatments increased soluble solids concentration (SSC) in the season of application. A significant interaction between GA 3 rate and time of application was observed on increased fruit firmness in the current season. Increasing rates of GA 3 decreased flowering the following season in a quadratic fashion, resulting in a 41% to 90% diminished requirement for hand thinning. This translated into lower crop loads and yields for GA 3 -treated trees at harvest compared with untreated control trees. However, GA 3 -treated trees had larger mean fruit size and improved fruit size distribution the year after GA 3 application. Advanced fruit ripening was also evident by increased fruit SSC and decreased fruit firmness, likely an indirect effect of GA 3 on crop load. GA 3 application timing significantly increased overall tree growth measured by the changes in trunk cross-sectional area.
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Claims 12
Claim · model-written summary
Late GA3 treatments increased soluble solids concentration in the season of application.
- Taxon
- peach
Prunus persicae0 - Treatment
- Late GA 3 treatmentse1
- Outcome
- soluble solids concentration (SSC)e1
- Direction
- increasede1
- Qualifier
- in the season of applicatione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA 3 was applied at 7, 10, and 13 weeks after full bloom to mature `Redhaven' peach trees”
e1“Late GA 3 treatments increased soluble solids concentration (SSC) in the season of application”
Claim · model-written summary
A significant interaction between GA3 rate and application time was observed on increased fruit firmness in the current season.
- Taxon
- peachPrunus persicae0
- Treatment
- GA 3 rate and time of applicatione2
- Outcome
- fruit firmnesse2
- Direction
- increasede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA 3 was applied at 7, 10, and 13 weeks after full bloom to mature `Redhaven' peach trees”
e2“A significant interaction between GA 3 rate and time of application was observed on increased fruit firmness in the current season”
Claim · model-written summary
Increasing GA3 rates decreased flowering the following season in a quadratic fashion.
- Taxon
- peachPrunus persicae0
- Treatment
- Increasing rates of GA 3e3
- Outcome
- floweringe3
- Direction
- decreasede3
- Qualifier
- in a quadratic fashione3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA 3 was applied at 7, 10, and 13 weeks after full bloom to mature `Redhaven' peach trees”
e3“Increasing rates of GA 3 decreased flowering the following season in a quadratic fashion, resulting in a 41% to 90% diminished requirement for hand thinning”
Claim · model-written summary
Increasing GA3 rates reduced the requirement for hand thinning by 41% to 90%.
- Taxon
- peachPrunus persicae0
- Treatment
- Increasing rates of GA 3e3
- Outcome
- requirement for hand thinninge3
- Direction
- diminishede3
- Value
- 41% to 90%e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA 3 was applied at 7, 10, and 13 weeks after full bloom to mature `Redhaven' peach trees”
e3“Increasing rates of GA 3 decreased flowering the following season in a quadratic fashion, resulting in a 41% to 90% diminished requirement for hand thinning”
Claim · model-written summary
GA3-treated trees had lower crop loads at harvest than untreated control trees.
- Taxon
- peachPrunus persicae0
- Treatment
- GA 3 -treated treese4
- Outcome
- crop loadse4
- Direction
- lowere4
- Comparator
- untreated control treese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA 3 was applied at 7, 10, and 13 weeks after full bloom to mature `Redhaven' peach trees”
e4“This translated into lower crop loads and yields for GA 3 -treated trees at harvest compared with untreated control trees”
Claim · model-written summary
GA3-treated trees had lower yields at harvest than untreated control trees.
- Taxon
- peachPrunus persicae0
- Treatment
- GA 3 -treated treese4
- Outcome
- yieldse4
- Direction
- lowere4
- Comparator
- untreated control treese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA 3 was applied at 7, 10, and 13 weeks after full bloom to mature `Redhaven' peach trees”
e4“This translated into lower crop loads and yields for GA 3 -treated trees at harvest compared with untreated control trees”
Claim · model-written summary
GA3-treated trees had larger mean fruit size the year after application.
- Taxon
- peachPrunus persicae0
- Treatment
- GA 3 -treated treese5
- Outcome
- mean fruit sizee5
- Direction
- largere5
- Qualifier
- the year after GA 3 applicatione5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA 3 was applied at 7, 10, and 13 weeks after full bloom to mature `Redhaven' peach trees”
e5“However, GA 3 -treated trees had larger mean fruit size and improved fruit size distribution the year after GA 3 application”
Claim · model-written summary
GA3-treated trees had improved fruit size distribution the year after application.
- Taxon
- peachPrunus persicae0
- Treatment
- GA 3 -treated treese5
- Outcome
- fruit size distributione5
- Direction
- improvede5
- Qualifier
- the year after GA 3 applicatione5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA 3 was applied at 7, 10, and 13 weeks after full bloom to mature `Redhaven' peach trees”
e5“However, GA 3 -treated trees had larger mean fruit size and improved fruit size distribution the year after GA 3 application”
Claim · model-written summary
Advanced fruit ripening was evident as increased fruit SSC.
- Taxon
- peachPrunus persicae0
- Outcome
- fruit SSCe6
- Direction
- increasede6
- Qualifier
- Advanced fruit ripeninge6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA 3 was applied at 7, 10, and 13 weeks after full bloom to mature `Redhaven' peach trees”
e6“Advanced fruit ripening was also evident by increased fruit SSC and decreased fruit firmness, likely an indirect effect of GA 3 on crop load”
Claim · model-written summary
Advanced fruit ripening was evident as decreased fruit firmness.
- Taxon
- peachPrunus persicae0
- Outcome
- fruit firmnesse6
- Direction
- decreasede6
- Qualifier
- Advanced fruit ripeninge6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA 3 was applied at 7, 10, and 13 weeks after full bloom to mature `Redhaven' peach trees”
e6“Advanced fruit ripening was also evident by increased fruit SSC and decreased fruit firmness, likely an indirect effect of GA 3 on crop load”
Claim · model-written summary
The advanced fruit ripening is likely an indirect effect of GA3 on crop load.
- Taxon
- peachPrunus persicae0
- Treatment
- GA 3e6
- Outcome
- Advanced fruit ripeninge6
- Qualifier
- likely an indirect effect of GA 3 on crop loade6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA 3 was applied at 7, 10, and 13 weeks after full bloom to mature `Redhaven' peach trees”
e6“Advanced fruit ripening was also evident by increased fruit SSC and decreased fruit firmness, likely an indirect effect of GA 3 on crop load”
Claim · model-written summary
GA3 application timing significantly increased overall tree growth, measured by trunk cross-sectional area.
- Taxon
- peachPrunus persicae0
- Treatment
- GA 3 application timinge7
- Outcome
- overall tree growthe7
- Direction
- increasede7
- Qualifier
- measured by the changes in trunk cross-sectional areae7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GA 3 was applied at 7, 10, and 13 weeks after full bloom to mature `Redhaven' peach trees”
e7“GA 3 application timing significantly increased overall tree growth measured by the changes in trunk cross-sectional area”
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See all 7 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.