Abstract
This paper presents a detailed description of effects from two pruning times and an application of hydrogen cyanamide on budburst and subsequent phenology in a population of spur-pruned, 13-year-old Vitis vinifera L. Cabernet Sauvignon vines grown in central Victoria in 1998/99. Later pruning (17 August), compared with earlier pruning (7 July), delayed the onset of budburst by an average of 4.3 days and 60% budburst by an average of 5.3 days. This difference persisted at anthesis (5.0 days), veraison (4.1 days) and at harvest (0.91°Brix). Application of hydrogen cyanamide on 26 August did not advance the timing of budburst but increased the number of shoots that burst. This was due predominantly to more ‘extra’ shoots bursting on old wood and at the base of spurs. In the earlier stages of budburst, ‘primary’ buds on clear nodes of 1 year-old wood (spurs) burst in preference to buds at the base of spurs or on old wood. However, by the end of the 5-week budburst period, the number of ‘extra’ shoots per vine was similar to the number of primary shoots on clear nodes. Primary shoots with more bunches tended to burst earlier. Conceivably, the number of inflorescences (potential reproductive sites) and the number of flowers (potential number of seeds) on a shoot that arises from a dormant latent bud indicate a ‘reproductive potential’ that exerts some control over dormancy release. The frequency of budburst was sensitive to fluctuations in air temperature, but limited by the number of buds available to burst. Temperature-based models designed to predict phenological events might be improved by including parameters that take pruning time and reproductive potential into account.
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Claims 13
Claim · model-written summary
Later pruning delayed onset of budburst by 4.3 days.
- Taxon
- Vitis vinifera L.
Vitis viniferat0 - Material
- Cabernet Sauvignont0
- Treatment
- Later pruning (17 August)e0
- Outcome
- onset of budburste0
- Direction
- delayede0
- Value
- 4.3 dayse0
- Comparator
- earlier pruning (7 July)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Later pruning (17 August), compared with earlier pruning (7 July), delayed the onset of budburst by an average of 4.3 days”
t0“Vitis vinifera L. variety Cabernet Sauvignon”
Claim · model-written summary
Later pruning delayed 60% budburst by 5.3 days.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Treatment
- Later pruningt1
- Outcome
- 60% budburste0
- Direction
- delayedt1
- Value
- 5.3 dayse0
- Comparator
- earlier pruningt1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“60% budburst by an average of 5.3 days”
t0“Vitis vinifera L. variety Cabernet Sauvignon”
t1“Later pruning (17 August), compared with earlier pruning (7 July), delayed the onset of budburst by an average of 4.3 days and 60% budburst by an average of 5.3 days.”
Claim · model-written summary
The pruning difference persisted at anthesis by 5.0 days.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Outcome
- anthesise0
- Direction
- persistede0
- Value
- 5.0 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This difference persisted at anthesis (5.0 days)”
t0“Vitis vinifera L. variety Cabernet Sauvignon”
Claim · model-written summary
The pruning difference persisted at veraison by 4.1 days.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Outcome
- veraisone0
- Value
- 4.1 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“veraison (4.1 days)”
t0“Vitis vinifera L. variety Cabernet Sauvignon”
Claim · model-written summary
The pruning difference persisted at harvest at 0.91°Brix.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Outcome
- harveste0
- Value
- 0.91°Brixe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at harvest (0.91°Brix)”
t0“Vitis vinifera L. variety Cabernet Sauvignon”
Claim · model-written summary
Hydrogen cyanamide did not advance budburst timing.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Treatment
- Application of hydrogen cyanamide on 26 Auguste0
- Outcome
- timing of budburste0
- Direction
- did not advancee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of hydrogen cyanamide on 26 August did not advance the timing of budburst”
t0“Vitis vinifera L. variety Cabernet Sauvignon”
Claim · model-written summary
Hydrogen cyanamide increased the number of shoots that burst.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Treatment
- Application of hydrogen cyanamide on 26 Auguste0
- Outcome
- number of shoots that burste0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of hydrogen cyanamide on 26 August did not advance the timing of budburst but increased the number of shoots that burst.”
t0“Vitis vinifera L. variety Cabernet Sauvignon”
Claim · model-written summary
The increased burst was predominantly from extra shoots on old wood and spur bases.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Organ / stage
- old wood and at the base of spurse0
- Outcome
- more ‘extra’ shoots burstinge0
- Direction
- moree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was due predominantly to more ‘extra’ shoots bursting on old wood and at the base of spurs.”
t0“Vitis vinifera L. variety Cabernet Sauvignon”
Claim · model-written summary
Primary buds on clear nodes burst preferentially early in budburst.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Organ / stage
- ‘primary’ buds on clear nodes of 1 year-old wood (spurs)e0
- Outcome
- burst in preferencee0
- Direction
- in preferencee0
- Comparator
- buds at the base of spurs or on old woode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the earlier stages of budburst, ‘primary’ buds on clear nodes of 1 year-old wood (spurs) burst in preference to buds at the base of spurs or on old wood.”
t0“Vitis vinifera L. variety Cabernet Sauvignon”
Claim · model-written summary
By the end of five weeks, extra shoot number resembled primary shoot number.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Outcome
- number of ‘extra’ shoots per vinee0
- Direction
- similare0
- Qualifier
- 5-week budburst periode0
- Comparator
- number of primary shoots on clear nodese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“by the end of the 5-week budburst period, the number of ‘extra’ shoots per vine was similar to the number of primary shoots on clear nodes.”
t0“Vitis vinifera L. variety Cabernet Sauvignon”
Claim · model-written summary
Primary shoots with more bunches tended to burst earlier.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Organ / stage
- Primary shootse0
- Outcome
- burste0
- Direction
- earliere0
- Qualifier
- more bunchese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Primary shoots with more bunches tended to burst earlier.”
t0“Vitis vinifera L. variety Cabernet Sauvignon”
Claim · model-written summary
Budburst frequency was sensitive to air temperature fluctuations.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Treatment
- fluctuations in air temperaturee0
- Outcome
- frequency of budburste0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The frequency of budburst was sensitive to fluctuations in air temperature”
t0“Vitis vinifera L. variety Cabernet Sauvignon”
Claim · model-written summary
Bud availability limited budburst frequency.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Organ / stage
- budse0
- Outcome
- number of buds available to burste0
- Direction
- limitede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“limited by the number of buds available to burst”
t0“Vitis vinifera L. variety Cabernet Sauvignon”
The same questions in other papers
cyanamide · phenology · Vitis vinifera (wine grape)Positive and negative results
1 in the opposite direction
- positive
cyanamide · growth · Vitis vinifera (wine grape)Results agree
1 paper in the same direction as this paper
- positive
pruning · phenology · Vitis vinifera (wine grape)Positive and negative results
5 papers in the same direction as this paper · 9 in the opposite direction
- no effect
- positive
- positive
11 papers more in this group
See all 15 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.