Abstract
Th e infl uence of partial defoliation performed at diff erent grapevine growth stages on yield components, vegetative growth and fruit composition of 'Istrian Malvasia' ('Malvazija istarska') vines was investigated.During two consecutive seasons partial defoliation was performed manually at three grapevine growth stages; before bloom (BB), aft er bloom (AB), and at the beginning of bunch closure (BC).Th ree to four leaves on the basal part of primary shoots were removed in order to obtain moderately open grapevine canopy with good bunch exposure to sunlight.Control treatment without partial defoliation was also included.Partial defoliation did not signifi cantly aff ect any of yield components of 'Istrian Malvasia' vines.Th e only consistent response to partial defoliation was the regrowth of laterals if partial defoliation was done early in the season, leading to the recovering of the removed leaf area from primary shoots.Less intensive regrowth of laterals occurred on BC treatment, resulting in the smallest leaf area per vine and the lowest leaf area/yield ratio, but the diff erences among treatments were not signifi cant.Basic composition of 'Istrian Malvasia' grape juice (soluble solids, titratable acidity and pH) was not signifi cantly aff ected by the timing of partial defoliation, but soluble solids tended to be higher in BB treatment and lower in BC treatment.It is concluded that the removal of three to four leaves per shoot at diff erent grapevine growth stages did not considerably aff ect yield components and basic fruit composition of 'Istrian Malvasia' vines.
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Claims 7
Claim · model-written summary
Partial defoliation did not significantly affect yield components.
- Taxon
- 'Istrian Malvasia' vinese0
- Treatment
- Partial defoliatione0
- Outcome
- yield componentse0
- Direction
- did not signifi cantly aff ecte0
Not reportedComparator
Verbatim
e0“Partial defoliation did not signifi cantly aff ect any of yield components of 'Istrian Malvasia' vines”
Claim · model-written summary
Early partial defoliation caused regrowth of lateral shoots that recovered removed primary shoot leaf area.
- Taxon
- Vitis vinifera L.
Vitis viniferat0 - Treatment
- partial defoliation was done early in the seasone0
- Outcome
- regrowth of lateralse0
- Direction
- regrowthe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the regrowth of laterals if partial defoliation was done early in the season, leading to the recovering of the removed leaf area from primary shoots”
t0“Vitis vinifera L.”
Claim · model-written summary
Defoliation at bunch closure yielded less lateral regrowth.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Treatment
- BC treatmente0
- Outcome
- regrowth of lateralse0
- Direction
- Less intensivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Less intensive regrowth of laterals occurred on BC treatment”
t0“Vitis vinifera L.”
Claim · model-written summary
The bunch-closure treatment gave the smallest leaf area and lowest leaf area to yield ratio, with nonsignificant treatment differences.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Treatment
- BC treatmente0
- Outcome
- leaf area per vine and the lowest leaf area/yield ratioe0
- Direction
- smalleste0
- Comparator
- among treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BC treatment, resulting in the smallest leaf area per vine and the lowest leaf area/yield ratio, but the diff erences among treatments were not signifi cant”
t0“Vitis vinifera L.”
Claim · model-written summary
Defoliation timing did not significantly affect grape juice soluble solids, titratable acidity, or pH.
- Taxon
- 'Istrian Malvasia'e0
- Treatment
- timing of partial defoliatione0
- Outcome
- soluble solids, titratable acidity and pHe0
- Direction
- not signifi cantly aff ectede0
Not reportedComparator
Verbatim
e0“Basic composition of 'Istrian Malvasia' grape juice (soluble solids, titratable acidity and pH) was not signifi cantly aff ected by the timing of partial defoliation”
Claim · model-written summary
Soluble solids tended to be higher with pre-bloom defoliation.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Treatment
- BB treatmente0
- Outcome
- soluble solidse0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soluble solids tended to be higher in BB treatment”
t0“Vitis vinifera L.”
Claim · model-written summary
Soluble solids tended to be lower with bunch-closure defoliation.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Treatment
- BC treatmente0
- Outcome
- soluble solidse0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soluble solids tended to be higher in BB treatment and lower in BC treatment”
t0“Vitis vinifera L.”
The same questions in other papers
pruning · growth · Vitis vinifera (wine grape)Results differ
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1 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
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.