Abstract
Sultanina grapevines were irrigated at 90%, 60% and 30% plant-available water (PAW) depletion during the growing season in a field trial on a fine sandy soil in the Lower Orange River region of South Africa. Grapevines of all treatments were irrigated at 60% PAW depletion during winter. Measurement of diurnal leaf water potential (tJ'1) cycles at different stages during the season showed that plant water status was not only a function of soil water availability, but also of meteorological conditions. Increasing vapour pressure deficit (VPD) decreased pre-dawn leaf water potential, suggesting nocturnal water loss via transpiration. On the other hand, tpl measured at 14h00 increased with an increase in VPD, indicating partial stomatal closure during the warmest part of the day. Vegetative growth, berry mass and production increased with increased plant water status as imposed by the different PAW depletion levels. PAW depletion level had almost no effect on sugar accumulation or acid breakdown. Soil water depletion level had no effect on the quality of dipped raisins. Hence, the ideal balance between vegetative growth, yield and water use efficiency for the production of dipped Sultanina raisins was obtained with irrigation at 60% PAW depletion. Since quality of sun-dried raisins was considerably reduced by irrigation at 60% as well as 90% PAW depletion, relative to 30% depletion, the latter seems to be the optimum depletion level for sun-dried raisin production. This optimum depletion level might not be applicable for irrigation of Sultanina on heavier, more fertile alluvial soils.
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Claims 9
Claim · model-written summary
Leaf water status varied with soil water availability and meteorological conditions.
- Taxon
- Vitis vinifera L. cv. Sultanina
Vitis viniferat0 - Outcome
- plant water statuse0
- Setting
- meteorological conditionse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plant water status was not only a function of soil water availability, but also of meteorological conditions.”
t0“Responses of Vitis vinifera L. cv. Sultanina to Level of Soil Water Depletion Under Semi-Arid Conditions”
Claim · model-written summary
Increasing VPD decreased predawn leaf water potential.
- Taxon
- Vitis vinifera L. cv. SultaninaVitis viniferat0
- Outcome
- pre-dawn leaf water potentiale0
- Direction
- decreasede0
- Setting
- vapour pressure deficit (VPD)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing vapour pressure deficit (VPD) decreased pre-dawn leaf water potential”
t0“Responses of Vitis vinifera L. cv. Sultanina to Level of Soil Water Depletion Under Semi-Arid Conditions”
Claim · model-written summary
Water potential at 14h00 increased with VPD.
- Taxon
- Vitis vinifera L. cv. SultaninaVitis viniferat0
- Outcome
- tpl measured at 14h00e0
- Direction
- increasede0
- Setting
- VPDe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tpl measured at 14h00 increased with an increase in VPD”
t0“Responses of Vitis vinifera L. cv. Sultanina to Level of Soil Water Depletion Under Semi-Arid Conditions”
Claim · model-written summary
Greater plant water status increased vegetative growth, berry mass and production.
- Taxon
- Vitis vinifera L. cv. SultaninaVitis viniferat0
- Treatment
- different PAW depletion levelse0
- Outcome
- Vegetative growth, berry mass and productione0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vegetative growth, berry mass and production increased with increased plant water status as imposed by the different PAW depletion levels.”
t0“Responses of Vitis vinifera L. cv. Sultanina to Level of Soil Water Depletion Under Semi-Arid Conditions”
Claim · model-written summary
PAW depletion had almost no effect on sugar accumulation or acid breakdown.
- Taxon
- Vitis vinifera L. cv. SultaninaVitis viniferat0
- Treatment
- PAW depletion levele0
- Outcome
- sugar accumulation or acid breakdowne0
- Direction
- almost no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PAW depletion level had almost no effect on sugar accumulation or acid breakdown.”
t0“Responses of Vitis vinifera L. cv. Sultanina to Level of Soil Water Depletion Under Semi-Arid Conditions”
Claim · model-written summary
Soil water depletion had no effect on dipped-raisin quality.
- Taxon
- Vitis vinifera L. cv. SultaninaVitis viniferat0
- Treatment
- Soil water depletion levele0
- Outcome
- quality of dipped raisinse0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil water depletion level had no effect on the quality of dipped raisins.”
t0“Responses of Vitis vinifera L. cv. Sultanina to Level of Soil Water Depletion Under Semi-Arid Conditions”
Claim · model-written summary
The best balance of growth, yield and water-use efficiency for dipped raisins occurred at 60% depletion.
Verbatim
e0“the ideal balance between vegetative growth, yield and water use efficiency for the production of dipped Sultanina raisins was obtained with irrigation at 60% PAW depletion.”
Claim · model-written summary
Irrigation at 60% and 90% depletion reduced sun-dried-raisin quality relative to 30%.
- Taxon
- Vitis vinifera L. cv. SultaninaVitis viniferat0
- Treatment
- irrigation at 60% as well as 90% PAW depletione0
- Outcome
- quality of sun-dried raisinse0
- Direction
- reducede0
- Comparator
- 30% depletione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“quality of sun-dried raisins was considerably reduced by irrigation at 60% as well as 90% PAW depletion, relative to 30% depletion”
t0“Responses of Vitis vinifera L. cv. Sultanina to Level of Soil Water Depletion Under Semi-Arid Conditions”
Claim · model-written summary
The authors recommend 30% depletion for sun-dried raisin production.
- Taxon
- Vitis vinifera L. cv. SultaninaVitis viniferat0
- Outcome
- optimum depletion level for sun-dried raisin productione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the latter seems to be the optimum depletion level for sun-dried raisin production.”
t0“Responses of Vitis vinifera L. cv. Sultanina to Level of Soil Water Depletion Under Semi-Arid Conditions”
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