Abstract
Two-year study was conducted on Italian Riesling cultivar with the aim to compare the effect of foliar sprays with different nitrogen forms on grapevine leaf N status, yield, and nitrogen compounds in grape juice. Treatments included no fertilization (control), soil NPK treatment, and three foliar treatments [amino acids, urea, ammonia (NH 4 + )/nitrate] applied four times during season, also treated with soil NPK. The application of 1% w/v urea significantly increased leaf total leaf N content in the second year of study. However, there were no effects on N compounds in grape juice, since changes in free amino nitrogen (FAN), NH 4 + , and consequently yeast assimilable nitrogen (YAN) were not consistent among the treatments and experimental years. Although increase of vine leaf N status was achieved by 1% w/v urea, additional modifying of application time (by moving it closer to veraison) is needed, with the aim to increase N compounds in grape juice as well.
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Claims 3
Claim · model-written summary
Urea increased leaf total nitrogen in year two.
- Taxon
- Vitis vinifera L.
Vitis viniferat0 - Treatment
- 1% w/v ureae0
- Outcome
- leaf total leaf N contente0
- Direction
- increasede0
- Qualifier
- in the second year of studye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of 1% w/v urea significantly increased leaf total leaf N content in the second year of study.”
t0“Vitis vinifera L.”
Claim · model-written summary
Treatments produced no consistent change in juice nitrogen compounds across years.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Treatment
- three foliar treatmentse1
- Outcome
- N compounds in grape juicee0
- Direction
- no effectse0
- Qualifier
- not consistent among the treatments and experimental yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were no effects on N compounds in grape juice, since changes in free amino nitrogen (FAN), NH 4 + , and consequently yeast assimilable nitrogen (YAN) were not consistent among the treatments and experimental years.”
e1“three foliar treatments [amino acids, urea, ammonia (NH 4 + )/nitrate]”
t0“Vitis vinifera L.”
Claim · model-written summary
Authors recommend moving urea application nearer veraison to increase juice nitrogen.
- Taxon
- Vitis vinifera L.Vitis viniferat0
- Outcome
- moving it closer to veraisone0
- Qualifier
- increase N compounds in grape juicee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“additional modifying of application time (by moving it closer to veraison) is needed, with the aim to increase N compounds in grape juice as well.”
t0“Vitis vinifera L.”
The same questions in other papers
nitrogen · nutrient: content · Vitis vinifera (wine grape)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.