Abstract
Vigor and crop level management are important practices for premium wine grape production. The implications of crop thinning ‘Pinot noir’( Vitis vinifera L.) vines of varying vigor were investigated in the Willamette Valley of Oregon in 2011 to 2013 to better understand the relationship between canopy size and yield within the framework of a cool-climate, premium production wine grape vineyard. To manipulate vigor, a competitive grass cover crop ( Festuca rubra L.) was grown in both (Grass), alternating (Alternate), or neither side of the flanking alleyways (Tilled). Vines within each vineyard floor treatment had two crop levels applied, including cluster thinning to one cluster per shoot (Half Crop) or no crop thinning (Full Crop). Grass treatment had reduced leaf area and leaf nitrogen (N) concentrations during all years compared with Tilled treatments. Leaf photosynthesis was also lower in Grass treatments despite more light in the canopy interior. Grass treatments had lower yield than Tilled treatments in 2 of 3 years and lower yeast assimilable nitrogen (YAN) concentrations in fruit every year. There was limited impact of floor treatments on total soluble solids (TSS) and pH. Reduced yields through cluster thinning had limited impact on vegetative growth but increased TSS and pH, in 2 of 3 years. There were few floor management by crop level interactions in any year. Grass effectively reduced vegetative growth to moderate vigor levels with cane weights between 20 and 40 g. Using a competitive grass cover crop may be an effective strategy to reduce excessive vine growth and require less labor in canopy management and crop thinning without compromising basic fruit ripeness, although YAN levels need to be monitored.
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Claims 10
Claim · model-written summary
Grass vineyard floor treatment reduced leaf area and leaf nitrogen concentrations in all years compared with Tilled treatments in Pinot noir.
- Taxon
- Vitis vinifera L.
Vitis viniferae0 - Treatment
- Grass treatmente1
- Outcome
- leaf area and leaf nitrogen (N) concentrationse1
- Direction
- reducede1
- Comparator
- Tilled treatmentse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vitis vinifera L.”
e1“Grass treatment had reduced leaf area and leaf nitrogen (N) concentrations during all years compared with Tilled treatments”
Claim · model-written summary
Leaf photosynthesis was lower in Grass treatments than in other treatments, despite more light in the canopy interior.
- Taxon
- Vitis vinifera L.Vitis viniferae0
- Treatment
- Grass treatmentse1
- Outcome
- Leaf photosynthesise1
- Direction
- lowere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vitis vinifera L.”
e1“Leaf photosynthesis was also lower in Grass treatments despite more light in the canopy interior”
Claim · model-written summary
Grass treatments had lower yield than Tilled treatments in 2 of 3 years.
- Taxon
- Vitis vinifera L.Vitis viniferae0
- Treatment
- Grass treatmentse1
- Outcome
- yielde1
- Direction
- lowere1
- Qualifier
- 2 of 3 yearse1
- Comparator
- Tilled treatmentse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vitis vinifera L.”
e1“Grass treatments had lower yield than Tilled treatments in 2 of 3 years”
Claim · model-written summary
Grass treatments had lower yeast assimilable nitrogen concentrations in fruit every year.
- Taxon
- Vitis vinifera L.Vitis viniferae0
- Organ / stage
- fruite1
- Treatment
- Grass treatmentse1
- Outcome
- yeast assimilable nitrogen (YAN) concentrationse1
- Direction
- lowere1
- Qualifier
- every yeare1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vitis vinifera L.”
e1“Grass treatments had lower yield than Tilled treatments in 2 of 3 years and lower yeast assimilable nitrogen (YAN) concentrations in fruit every year”
Claim · model-written summary
Floor treatments had limited impact on total soluble solids and pH.
- Taxon
- Vitis vinifera L.Vitis viniferae0
- Treatment
- floor treatmentse1
- Outcome
- total soluble solids (TSS) and pHe1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vitis vinifera L.”
e1“There was limited impact of floor treatments on total soluble solids (TSS) and pH”
Claim · model-written summary
Reduced yields through cluster thinning had limited impact on vegetative growth.
- Taxon
- Vitis vinifera L.Vitis viniferae0
- Treatment
- cluster thinninge1
- Outcome
- vegetative growthe1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vitis vinifera L.”
e1“Reduced yields through cluster thinning had limited impact on vegetative growth but increased TSS and pH, in 2 of 3 years”
Claim · model-written summary
Cluster thinning increased total soluble solids and pH in 2 of 3 years.
- Taxon
- Vitis vinifera L.Vitis viniferae0
- Treatment
- cluster thinninge1
- Outcome
- TSS and pHe1
- Direction
- increasede1
- Qualifier
- 2 of 3 yearse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vitis vinifera L.”
e1“Reduced yields through cluster thinning had limited impact on vegetative growth but increased TSS and pH, in 2 of 3 years”
Claim · model-written summary
Few interactions between floor management and crop level were found in any year.
- Taxon
- Vitis vinifera L.Vitis viniferae0
- Outcome
- few floor management by crop level interactionse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vitis vinifera L.”
e1“There were few floor management by crop level interactions in any year”
Claim · model-written summary
Grass cover crop reduced vegetative growth to moderate vigor levels, with cane weights between 20 and 40 g.
- Taxon
- Vitis vinifera L.Vitis viniferae0
- Treatment
- Grasse1
- Outcome
- vegetative growthe1
- Direction
- reducede1
- Value
- between 20 and 40 ge1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vitis vinifera L.”
e1“Grass effectively reduced vegetative growth to moderate vigor levels with cane weights between 20 and 40 g”
Claim · model-written summary
The authors suggest a competitive grass cover crop may be an effective strategy to reduce excessive vine growth, with less labor and without compromising fruit ripeness.
- Taxon
- Vitis vinifera L.Vitis viniferae0
- Treatment
- competitive grass cover crope1
- Outcome
- reduce excessive vine growthe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vitis vinifera L.”
e1“Using a competitive grass cover crop may be an effective strategy to reduce excessive vine growth and require less labor in canopy management and crop thinning without compromising basic fruit ripeness”
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See all 54 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.