Abstract
Hannam, K. D., Neilsen, G. H., Forge, T. and Neilsen, D. 2013. The concentration of yeast assimilable nitrogen in Merlot grape juice is increased by N fertilization and reduced irrigation. Can. J. Plant Sci. 93: 37–45. Vineyard management practices that can be used to elevate yeast-assimilable nitrogen (YAN) above the 140 mg N L −1 required for efficient fermentation are of critical interest. The effects of N fertilization and reduced irrigation frequency on grape juice YAN, fruit composition and yield were examined in a 5-yr study on Merlot (Vitis vinifera L.) vines. Fertilization with N increased the concentration of YAN in grape juice by improving grapevine N status as indicated by petiole N concentrations. Reduced irrigation frequency appeared to have no effect on grape juice YAN status but short-term reductions in the quantity of applied water during the early stages of berry development in 2 of the study years did increase YAN. Juice pH was sometimes increased by reduced irrigation and N application treatments, but levels remained acceptable for wine production. Other measures of fruit composition were less sensitive to irrigation and N fertilization treatments. Inter-annual variability played an important role in determining grape juice YAN, fruit composition and yield. Future work should focus on refining management practices, e.g., the timing of N application, to minimize the effects of annual variability on grape juice YAN concentrations.
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Claims 8
Claim · model-written summary
N fertilization increased yeast-assimilable nitrogen (YAN) concentration in Merlot grape juice.
- Taxon
- Vitis vinifera L.
Vitis viniferae2 - Material
- Merlote2
- Treatment
- Fertilization with Ne1
- Outcome
- concentration of YAN in grape juicee1
- Direction
- increasede1
- Qualifier
- by improving grapevine N status as indicated by petiole N concentrationse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Fertilization with N increased the concentration of YAN in grape juice by improving grapevine N status as indicated by petiole N concentrations”
e2“examined in a 5-yr study on Merlot (Vitis vinifera L.) vines”
Claim · model-written summary
Reduced irrigation frequency appeared to have no effect on grape juice YAN status.
- Taxon
- Vitis vinifera L.Vitis viniferae2
- Material
- Merlote2
- Treatment
- Reduced irrigation frequencye3
- Outcome
- grape juice YAN statuse3
- Direction
- no_changeinferrede3
- Qualifier
- appeared toe3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“examined in a 5-yr study on Merlot (Vitis vinifera L.) vines”
e3“Reduced irrigation frequency appeared to have no effect on grape juice YAN status”
Claim · model-written summary
Short-term reductions in applied water during early berry development increased grape juice YAN in 2 of the study years.
- Taxon
- Vitis vinifera L.Vitis viniferae2
- Organ / stage
- early stages of berry developmente4
- Treatment
- short-term reductions in the quantity of applied watere4
- Outcome
- YANe4
- Direction
- increasee4
- Setting
- 2 of the study yearse4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“examined in a 5-yr study on Merlot (Vitis vinifera L.) vines”
e4“short-term reductions in the quantity of applied water during the early stages of berry development in 2 of the study years did increase YAN”
Claim · model-written summary
Reduced irrigation sometimes increased juice pH, though levels remained acceptable for wine production.
- Taxon
- Vitis vinifera L.Vitis viniferae2
- Treatment
- reduced irrigatione5
- Outcome
- juice pHe5
- Direction
- increasede5
- Qualifier
- sometimese5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“examined in a 5-yr study on Merlot (Vitis vinifera L.) vines”
e5“Juice pH was sometimes increased by reduced irrigation and N application treatments, but levels remained acceptable for wine production”
Claim · model-written summary
N application sometimes increased juice pH, though levels remained acceptable for wine production.
- Taxon
- Vitis vinifera L.Vitis viniferae2
- Treatment
- N applicatione5
- Outcome
- juice pHe5
- Direction
- increasede5
- Qualifier
- sometimese5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“examined in a 5-yr study on Merlot (Vitis vinifera L.) vines”
e5“Juice pH was sometimes increased by reduced irrigation and N application treatments, but levels remained acceptable for wine production”
Claim · model-written summary
Other measures of fruit composition were less sensitive to irrigation and N fertilization treatments.
- Taxon
- Vitis vinifera L.Vitis viniferae2
- Treatment
- irrigation and N fertilization treatmentse6
- Outcome
- other measures of fruit compositione6
- Direction
- less sensitivee6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“examined in a 5-yr study on Merlot (Vitis vinifera L.) vines”
e6“Other measures of fruit composition were less sensitive to irrigation and N fertilization treatments”
Claim · model-written summary
Inter-annual variability played an important role in determining grape juice YAN, fruit composition and yield.
- Taxon
- Vitis vinifera L.Vitis viniferae2
- Treatment
- Inter-annual variabilitye7
- Outcome
- grape juice YAN, fruit composition and yielde7
- Qualifier
- played an important role in determininge7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“examined in a 5-yr study on Merlot (Vitis vinifera L.) vines”
e7“Inter-annual variability played an important role in determining grape juice YAN, fruit composition and yield”
Claim · model-written summary
Future work should refine management practices, such as the timing of N application, to minimize the effects of annual variability on grape juice YAN.
- Taxon
- Vitis vinifera L.Vitis viniferae2
- Outcome
- refining management practicese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“examined in a 5-yr study on Merlot (Vitis vinifera L.) vines”
e7“Future work should focus on refining management practices, e.g., the timing of N application, to minimize the effects of annual variability on grape juice YAN concentrations”
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See all 20 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.