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Am. J. Enol. Vitic. 59:3:255-264 (2008)
Copyright © 2008 by the American Society for Enology and Viticulture.
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Must Composition and Nitrogen Uptake in a Long-term Trial as Affected by Timing of Nitrogen Fertilization in a Cool-Climate Riesling Vineyard

Albert W. Linsenmeier1,*, Uwe Loos1 and Otmar Löhnertz1

1 Forschungsanstalt Geisenheim, Fachgebiet Bodenkunde und Pflanzenernah-rung, von-Lade-Straβe 1, D-65366 Geisenheim, Germany.

* Corresponding author (email: linsenmeier{at}fa-gm.de)

A long-term, 15-year nitrogen (N) fertilization trial was carried out in Rheingau, Germany. While the control received no N, the fertilized treatments received 30, 60, or 90 kg N/ha. Treatments used in this investigation were 0/0, 30/0, 0/30, 60/0, 30/30, 0/60, 90/0, 60/30, and 30/60 (application of N/ha at budbreak/application of N/ha at fruit set). Fertilization at budbreak resulted in a peak of NO3 in the soil at fruit set; when N was applied at fruit set, the highest amounts of NO3 were found at veraison. Average NO3 concentration in the soil also increased with budbreak fertilization compared with fruit-set fertilization. Leaf analysis showed an increased N uptake with budbreak fertilization of 90 kg N/ha. Grape yield showed a reverse timing effect: earlier fertilization at budbreak resulted in lower yield. The same observation was made for total soluble solids when grapes were fertilized with 60 or 90 kg N/ha. The storage of Mg and Ca in grapes was increased by fruit-set fertilization compared with budbreak fertilization; in the highly fertilized treatment that was also true for N in must.

Key words: nitrogen fertilization, fertilization timing, nutrients, must quality






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Copyright © 2008 by the American Society for Enology and Viticulture.