Abstract
The effects of additional irrigation during berry ripening on water relations, growth and yield in Sauvignon blanc and Chenin blanc grapevines were investigated. In all treatments the grapevines were irrigated when berries reached pea size in December. One treatment received no further irrigation until after harvest. All of the remaining treatments received a second irrigation at vraison. Except for a single treatment, which was not irrigated during ripening, these treatments received a third irrigation at either 14, 21, 28 or 31 days after vraison. The six treatments were applied in a field trial carried out in the Stellenbosch district of the coastal winegrowing region of South Africa over consecutive seasons, between 1990 and 1993. Irrigation at pea size berries and at pea size berries plus vraison increased leaf water potential, but did not affect vegetative growth and yield in either cultivar. Relative to a single application at pea size berries, irrigation at pea size, at vraison and during ripening increased berry size in both cultivars, though not consistently, over the three seasons. However, this result must be viewed in terms of the fact that qualitative assessments of root development and distribution have revealed that effective soil preparation contributes to well-developed root systems. Results confirmed that these root systems could sustain vegetative growth and yield where a single irrigation was applied at pea size berries compared with additional irrigations applied at vraison and during ripening. Irrigation applied at, and after, vraison resulted in yield losses of both cultivars when rainfall favoured Botrytis cinerea infection.
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Claims 9
Claim · model-written summary
Irrigation at pea size and pea size plus vraison increased leaf water potential in Sauvignon blanc
- Taxon
- Vitis vinifera L.
Vitis viniferat0 - Treatment
- Irrigation at pea size berries and at pea size berries plus vraisone0
- Outcome
- leaf water potentiale0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation at pea size berries and at pea size berries plus vraison increased leaf water potential, but did not affect vegetative growth and yield in either cultivar.”
t0“Vitis vinifera L. cvs. Sauvignon blanc and Chenin blanc”
Claim · model-written summary
These irrigation schedules did not affect vegetative growth and yield in Sauvignon blanc
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Material
- Sauvignon blanct0
- Treatment
- Irrigation at pea size berries and at pea size berries plus vraisone0
- Outcome
- vegetative growth and yielde0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation at pea size berries and at pea size berries plus vraison increased leaf water potential, but did not affect vegetative growth and yield in either cultivar.”
t0“Vitis vinifera L. cvs. Sauvignon blanc and Chenin blanc”
Claim · model-written summary
Irrigation at pea size and pea size plus vraison increased leaf water potential in Chenin blanc
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Treatment
- Irrigation at pea size berries and at pea size berries plus vraisone0
- Outcome
- leaf water potentiale0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation at pea size berries and at pea size berries plus vraison increased leaf water potential, but did not affect vegetative growth and yield in either cultivar.”
t0“Vitis vinifera L. cvs. Sauvignon blanc and Chenin blanc”
Claim · model-written summary
These irrigation schedules did not affect vegetative growth and yield in Chenin blanc
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Material
- Chenin blanct0
- Treatment
- Irrigation at pea size berries and at pea size berries plus vraisone0
- Outcome
- vegetative growth and yielde0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation at pea size berries and at pea size berries plus vraison increased leaf water potential, but did not affect vegetative growth and yield in either cultivar.”
t0“Vitis vinifera L. cvs. Sauvignon blanc and Chenin blanc”
Claim · model-written summary
Additional irrigation at vraison and during ripening increased berry size in Sauvignon blanc, inconsistently across seasons.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Material
- Sauvignon blanct0
- Treatment
- irrigation at pea size, at vraison and during ripeninge0
- Outcome
- berry sizee0
- Direction
- increasede0
- Qualifier
- though not consistently, over the three seasonse0
- Comparator
- a single application at pea size berriese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative to a single application at pea size berries, irrigation at pea size, at vraison and during ripening increased berry size in both cultivars, though not consistently, over the three seasons.”
t0“Vitis vinifera L. cvs. Sauvignon blanc and Chenin blanc”
Claim · model-written summary
Additional irrigation at vraison and during ripening increased berry size in Chenin blanc, inconsistently across seasons.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Material
- Chenin blanct0
- Treatment
- irrigation at pea size, at vraison and during ripeninge0
- Outcome
- berry sizee0
- Direction
- increasede0
- Qualifier
- though not consistently, over the three seasonse0
- Comparator
- a single application at pea size berriese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative to a single application at pea size berries, irrigation at pea size, at vraison and during ripening increased berry size in both cultivars, though not consistently, over the three seasons.”
t0“Vitis vinifera L. cvs. Sauvignon blanc and Chenin blanc”
Claim · model-written summary
Well-developed root systems sustained vegetative growth and yield with one irrigation at pea size.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Treatment
- a single irrigation was applied at pea size berriese0
- Outcome
- vegetative growth and yielde0
- Comparator
- additional irrigations applied at vraison and during ripeninge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results confirmed that these root systems could sustain vegetative growth and yield where a single irrigation was applied at pea size berries compared with additional irrigations applied at vraison and during ripening.”
t0“Vitis vinifera L. cvs. Sauvignon blanc and Chenin blanc”
Claim · model-written summary
Irrigation at and after vraison caused yield loss in Sauvignon blanc when rainfall favoured Botrytis infection.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Material
- Sauvignon blanct0
- Treatment
- Irrigation applied at, and after, vraisone0
- Interactor
- Botrytis cinerea
Botrytis cinereae0pathogen - Outcome
- yield lossese0
- Direction
- lossese0
- Qualifier
- when rainfall favoured Botrytis cinerea infectione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation applied at, and after, vraison resulted in yield losses of both cultivars when rainfall favoured Botrytis cinerea infection.”
t0“Vitis vinifera L. cvs. Sauvignon blanc and Chenin blanc”
Claim · model-written summary
Irrigation at and after vraison caused yield loss in Chenin blanc when rainfall favoured Botrytis infection.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Material
- Chenin blanct0
- Treatment
- Irrigation applied at, and after, vraisone0
- Interactor
- Botrytis cinereaBotrytis cinereae0pathogen
- Outcome
- yield lossese0
- Direction
- lossese0
- Qualifier
- when rainfall favoured Botrytis cinerea infectione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation applied at, and after, vraison resulted in yield losses of both cultivars when rainfall favoured Botrytis cinerea infection.”
t0“Vitis vinifera L. cvs. Sauvignon blanc and Chenin blanc”
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