Articles
NITROGEN FOLIAR UPTAKE AND PARTITIONING IN “CABERNET SAUVIGNON” GRAPEVINES
Article number
868_21
Pages
185 – 190
Language
English
Abstract
Avoiding nitrogen (N) deficiency in grapes (Vitis vinifera L.) is necessary to satisfy its annual nutrient requirements.
Foliar nutrition is a rapid method to decrease temporary N deficiency while reducing uptake during the vegetative and reproductive season.
To better understand N uptake dynamics by foliar spray applications and its partitioning in vine organs, labeled N (15N) was used in the present study.
The trial was undertaken at the IASMA vineyard on fifteen – year old vines of the cultivar Cabernet Sauvignon raised on a cordon spur training system.
Foliar N nutrition was applied during four main phenological phases (pre-flowering, pre-bunch closure, veraison and harvest) on four vines per time using an ammonium sulfate solution where 15N was enriched to 10 atom %. Each vine was fertilized with 10 ml of solution applied on both sides of the leaf which therefore received a total of 21.2 mg of 15N. After one week the vines were destructively harvested and then divided into: axis of shoot, leaves, bunches and/or inflorescences, wood, bark, fine (<2 mm) and coarse (>2 mm) roots.
Each sample was dried and weighed, and a sub-sample was used to determine N uptake.
There was a large difference in N uptake efficiency between the phenological phases.
Pre-flowering uptake efficiency was 38.0%, in pre-bunch closure 30.0%, at veraison 21.7% and at harvest 66.0%. This difference can be explained by quantifying the timing and quantity of rain fall after treatment.
Foliar nutrition is a rapid method to decrease temporary N deficiency while reducing uptake during the vegetative and reproductive season.
To better understand N uptake dynamics by foliar spray applications and its partitioning in vine organs, labeled N (15N) was used in the present study.
The trial was undertaken at the IASMA vineyard on fifteen – year old vines of the cultivar Cabernet Sauvignon raised on a cordon spur training system.
Foliar N nutrition was applied during four main phenological phases (pre-flowering, pre-bunch closure, veraison and harvest) on four vines per time using an ammonium sulfate solution where 15N was enriched to 10 atom %. Each vine was fertilized with 10 ml of solution applied on both sides of the leaf which therefore received a total of 21.2 mg of 15N. After one week the vines were destructively harvested and then divided into: axis of shoot, leaves, bunches and/or inflorescences, wood, bark, fine (<2 mm) and coarse (>2 mm) roots.
Each sample was dried and weighed, and a sub-sample was used to determine N uptake.
There was a large difference in N uptake efficiency between the phenological phases.
Pre-flowering uptake efficiency was 38.0%, in pre-bunch closure 30.0%, at veraison 21.7% and at harvest 66.0%. This difference can be explained by quantifying the timing and quantity of rain fall after treatment.
Authors
D. Porro, M. Stefanini, C. Dorigatti, L. Ziller, F. Camin, M. Policarpo
Keywords
nutrition, ammonium, phenological phase, 15N
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