Translator Disclaimer
1 January 2013 The concentration of yeast assimilable nitrogen in Merlot grape juice is increased by N fertilization and reduced irrigation
Author Affiliations +
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.

K. D. Hannam, G. H. Neilsen, T. Forge, and D. Neilsen "The concentration of yeast assimilable nitrogen in Merlot grape juice is increased by N fertilization and reduced irrigation," Canadian Journal of Plant Science 93(1), 37-45, (1 January 2013). https://doi.org/10.1139/CJPS2012-092
Received: 24 April 2012; Accepted: 1 August 2012; Published: 1 January 2013
JOURNAL ARTICLE
9 PAGES


SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top