Abstract
The effect of nitrogen supply on the vegetative and reproductive capacity of vines of low nitrogen status was investigated in a field trial conducted in Western Australia. Five rates of nitrogen fertilizer (0, 50, 100, 200, and 400 g N/vine) were applied to irrigated, 12-year-old Cabernet Sauvignon vines over three seasons. Two-thirds of the nitrogen was applied late budbreak and the rest at two weeks after flowering. Moderate rates of nitrogen fertilization stimulated vine growth and vigor (shoot extension rate) resulting in an increase in canopy density. Prior to flowering, maximum vine vigor was observed upon addition of 100 g N/vine. This effect was no longer evident after flowering. Those vines supplemented with 100 g of nitrogen also achieved maximum petiole nitrate concentrations at flowering, growth (shoot length, pruning weight, and leaf area), and canopy density (leaf layer number). Vines receiving 400 g N/vine had shorter shoots and less pruning weight than vines receiving 100 g N/vine, as vigor did not respond to nitrogen fertilizer prior to flowering. However, the petiole nitrate concentration, total leaf area, and canopy density of vines supplied with 200 to 400 g N/vine were no different to those vines supplemented with 100 g N/vine. Nitrogen had no effect on the total vine yield in the first and last season. However, the highest yield came from vines receiving 100 g N/vine in the second season. Additional applications of 200 g and 400 g N/vine increased the yield no further. Higher berry numbers per bunch were associated with the increase in total vine yield. It appeared that moderate rates of nitrogen fertilization can have a beneficial effect on vine productivity in situations where vine nitrogen status is low. In contrast, excessive nitrogen fertilization was an unprofitable exercise as it provided no further benefits in terms of vine productivity.
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Claims 13
Claim · model-written summary
Moderate nitrogen fertilization increased vine vigor and canopy density.
- Taxon
- Vitis vinifera
Vitis viniferat0 - Treatment
- Moderate rates of nitrogen fertilizatione0
- Outcome
- vine growth and vigor (shoot extension rate)e0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moderate rates of nitrogen fertilization stimulated vine growth and vigor (shoot extension rate) resulting in an increase in canopy density.”
t0“Vitis vinifera”
Claim · model-written summary
At 100 g N/vine, vine vigor was maximal before flowering.
- Taxon
- Vitis viniferaVitis viniferat0
- Organ / stage
- Prior to floweringe0
- Treatment
- 100 g N/vinee0
- Outcome
- vine vigore0
- Direction
- maximume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Prior to flowering, maximum vine vigor was observed upon addition of 100 g N/vine.”
t0“Vitis vinifera”
Claim · model-written summary
The preflowering vigor effect was absent after flowering.
- Taxon
- Vitis viniferaVitis viniferat0
- Organ / stage
- after floweringe0
- Outcome
- This effect was no longer evidente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This effect was no longer evident after flowering.”
t0“Vitis vinifera”
Claim · model-written summary
At 100 g nitrogen, petiole nitrate concentration at flowering was maximal.
- Taxon
- Vitis viniferaVitis viniferat0
- Organ / stage
- at floweringe0
- Treatment
- 100 g of nitrogene0
- Outcome
- petiole nitrate concentrationse0
- Direction
- maximume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Those vines supplemented with 100 g of nitrogen also achieved maximum petiole nitrate concentrations at flowering”
t0“Vitis vinifera”
Claim · model-written summary
At 100 g nitrogen, growth and canopy density were maximal.
- Taxon
- Vitis viniferaVitis viniferat0
- Treatment
- 100 g of nitrogene1
- Outcome
- growth (shoot length, pruning weight, and leaf area), and canopy density (leaf layer number)e0
- Direction
- maximume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximum petiole nitrate concentrations at flowering, growth (shoot length, pruning weight, and leaf area), and canopy density (leaf layer number)”
e1“Those vines supplemented with 100 g of nitrogen”
t0“Vitis vinifera”
Claim · model-written summary
At 400 g N/vine, shoots and pruning weight were lower than at 100 g N/vine.
- Taxon
- Vitis viniferaVitis viniferat0
- Treatment
- 400 g N/vinee0
- Outcome
- shoots and less pruning weighte0
- Direction
- shortere0
- Comparator
- 100 g N/vinee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vines receiving 400 g N/vine had shorter shoots and less pruning weight than vines receiving 100 g N/vine”
t0“Vitis vinifera”
Claim · model-written summary
At 200 to 400 g N/vine, petiole nitrate, leaf area, and canopy density did not differ from 100 g N/vine.
- Taxon
- Vitis viniferaVitis viniferat0
- Treatment
- 200 to 400 g N/vinee0
- Outcome
- petiole nitrate concentration, total leaf area, and canopy densitye0
- Direction
- no differente0
- Comparator
- 100 g N/vinee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the petiole nitrate concentration, total leaf area, and canopy density of vines supplied with 200 to 400 g N/vine were no different to those vines supplemented with 100 g N/vine”
t0“Vitis vinifera”
Claim · model-written summary
Nitrogen did not affect total vine yield in the first and last seasons.
- Taxon
- Vitis viniferaVitis viniferat0
- Treatment
- Nitrogene0
- Outcome
- total vine yielde0
- Direction
- no effecte0
- Qualifier
- first and last seasone0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen had no effect on the total vine yield in the first and last season.”
t0“Vitis vinifera”
Claim · model-written summary
The highest yield in the second season occurred at 100 g N/vine.
- Taxon
- Vitis viniferaVitis viniferat0
- Treatment
- 100 g N/vinee0
- Outcome
- yielde0
- Direction
- higheste0
- Qualifier
- second seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest yield came from vines receiving 100 g N/vine in the second season”
t0“Vitis vinifera”
Claim · model-written summary
Additional 200 and 400 g N/vine did not further increase yield.
- Taxon
- Vitis viniferaVitis viniferat0
- Treatment
- 200 g and 400 g N/vinee0
- Outcome
- yielde0
- Direction
- no furthere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Additional applications of 200 g and 400 g N/vine increased the yield no further.”
t0“Vitis vinifera”
Claim · model-written summary
Higher berry numbers per bunch were associated with increased total yield.
- Taxon
- Vitis viniferaVitis viniferat0
- Organ / stage
- berrye0
- Outcome
- total vine yielde0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher berry numbers per bunch were associated with the increase in total vine yield.”
t0“Vitis vinifera”
Claim · model-written summary
The authors interpret moderate nitrogen as beneficial when vine nitrogen status is low.
- Taxon
- Vitis viniferaVitis viniferat0
- Outcome
- moderate rates of nitrogen fertilizatione0
- Qualifier
- vine nitrogen status is lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“moderate rates of nitrogen fertilization can have a beneficial effect on vine productivity in situations where vine nitrogen status is low”
t0“Vitis vinifera”
Claim · model-written summary
The authors judged excessive nitrogen unprofitable for vine productivity.
- Taxon
- Vitis viniferaVitis viniferat0
- Outcome
- excessive nitrogen fertilization was an unprofitable exercisee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“excessive nitrogen fertilization was an unprofitable exercise as it provided no further benefits in terms of vine productivity”
t0“Vitis vinifera”
The same questions in other papers
nitrogen · yield · Vitis vinifera (wine grape)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
nitrogen · growth · Vitis vinifera (wine grape)Positive and negative results
2 papers in the same direction as this paper · 5 reporting no difference from an alternative
- positive
- positive
- positive
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See all 8 papers →fertilization · growth · Vitis vinifera (wine grape)Positive and negative results
7 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- positive
6 papers more in this group
See all 10 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.