Abstract
An experiment was carried out to evaluate the potential for the use of sap flow measurement for scheduling irrigation in vineyards. Sap flow was measured over a 35-day period on 5 different varieties of grape vines (Vitis vinifera), with canopy leaf areas ranging from 3.4 to 16.4 m2. Irrigation was withheld from some vines to investigate whether sap flow sensors could be used to detect effects of water deficits on transpiration rates. Data obtained from sap flow sensors under well-watered conditions showed differences in transpiration rates caused by differing canopy sizes and changing evaporative demand due to diurnal and daily changes in meteorological conditions. When transpiration rates were expressed on a leaf area basis, mean transpiration from irrigated and non-irrigated vines were initially similar. With time, transpiration from non-irrigated vines became less than that from the irrigated vines. Also differences in diurnal patterns of sap flow became evident, with significantly more sap flow found at night for non-irrigated vines than for irrigated vines. Thus sap flow sensors were able to detect differences in both the timing and amount of water used by irrigated and nonirrigated vines and hence have potential application in irrigation scheduling.
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Claims 5
Claim · model-written summary
Sap flow sensors detected differences in the timing and amount of water used by irrigated and non-irrigated grapevines.
- Taxon
- Vitis vinifera
Vitis viniferae0 - Outcome
- timing and amount of water usede2
- Comparator
- irrigated and nonirrigated vinese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sap flow was measured over a 35-day period on 5 different varieties of grape vines (Vitis vinifera)”
e2“sap flow sensors were able to detect differences in both the timing and amount of water used by irrigated and nonirrigated vines”
Claim · model-written summary
Transpiration from non-irrigated grapevines became less than that from irrigated vines with time.
- Taxon
- Vitis viniferaVitis viniferae0
- Treatment
- Irrigation was withhelde1
- Outcome
- transpiratione3
- Direction
- became lesse3
- Comparator
- irrigated vinese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sap flow was measured over a 35-day period on 5 different varieties of grape vines (Vitis vinifera)”
e1“Irrigation was withheld from some vines”
e3“With time, transpiration from non-irrigated vines became less than that from the irrigated vines”
Claim · model-written summary
When transpiration was expressed per leaf area, mean transpiration of irrigated and non-irrigated grapevines was initially similar.
- Taxon
- Vitis viniferaVitis viniferae0
- Treatment
- Irrigation was withhelde1
- Outcome
- mean transpiratione4
- Direction
- no_changeinferrede4
- Qualifier
- When transpiration rates were expressed on a leaf area basise4
- Comparator
- irrigated and non-irrigated vinese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sap flow was measured over a 35-day period on 5 different varieties of grape vines (Vitis vinifera)”
e1“Irrigation was withheld from some vines”
e4“When transpiration rates were expressed on a leaf area basis, mean transpiration from irrigated and non-irrigated vines were initially similar”
Claim · model-written summary
Non-irrigated grapevines showed significantly more sap flow at night than irrigated vines.
- Taxon
- Vitis viniferaVitis viniferae0
- Treatment
- Irrigation was withhelde1
- Outcome
- sap flow found at nighte5
- Direction
- moree5
- Comparator
- irrigated vinese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sap flow was measured over a 35-day period on 5 different varieties of grape vines (Vitis vinifera)”
e1“Irrigation was withheld from some vines”
e5“significantly more sap flow found at night for non-irrigated vines than for irrigated vines”
Claim · model-written summary
Sap flow sensor data under well-watered conditions showed differences in transpiration rates caused by canopy size and evaporative demand.
- Taxon
- Vitis viniferaVitis viniferae0
- Outcome
- differences in transpiration ratese6
- Qualifier
- caused by differing canopy sizes and changing evaporative demande6
- Setting
- well-watered conditionse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sap flow was measured over a 35-day period on 5 different varieties of grape vines (Vitis vinifera)”
e6“Data obtained from sap flow sensors under well-watered conditions showed differences in transpiration rates caused by differing canopy sizes and changing evaporative demand”
The same questions in other papers
irrigation · physiology: gas exchange · Vitis vinifera (wine grape)Positive and negative results
1 paper in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 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.