Title page for ETD etd-08122016-204502

Type of Document Master's Thesis
Author Moss, James Russell
Author's Email Address jamesrm@vt.edu
URN etd-08122016-204502
Title Assessment of Vineyard Nitrogen Management upon Grape Chemistry
Degree Master of Science in Life Sciences
Department Food Science and Technology
Advisory Committee
Advisor Name Title
Dr. Amanda C. Stewart Committee Co-Chair
Dr. Tony K. Wolf Committee Co-Chair
Dr. Gregory M. Peck Committee Member
Dr. Sean F. Okeefe Committee Member
  • Vitis vinifera
  • foliar urea
  • calcium nitrate
  • YAN
  • UPLC
Date of Defense 2016-07-29
Availability restricted
To combat excessive vine vigor, many vintners have employed intensive cover cropping techniques. While cover crops provide a multitude of benefits to the farming system, they can compete for nutrients and water. The seemingly ubiquitous adoption of cover crops in the Eastern United States has led to vines and grape musts which are deficient in nitrogen (N). A must that is deficient in yeast assimilable nitrogen (YAN) can lead to the production of off aromas and stuck or sluggish fermentations. It has also been suggested that musts with limited amino nitrogen sources can result in wines with less fruity aromas than those with a higher starting amino acid content. Varying rates of calcium nitrate were applied to the soil at bloom and foliar urea was sprayed at a Sauvignon blanc and Petit Manseng (Vitis vinifera L.) vineyard. Perennial White and Crimson clover as well as foliar urea applications at véraison were utilized at a Vidal blanc (Vitis spp.) site. Foliar urea was effective at significantly increasing YANs in all experiments with some year to year variation in efficacy. Foliar urea applications slightly favored the production of ammonia over primary amino nitrogen. While most of the measured amino acids in fruit increased in concentration with the application of either soil or foliar N, foliar applications were more effective at increasing fruit amino acids. Of the amino acids measured, arginine and glutamine were the most increased by foliar urea applications, whereas proline was relatively unaffected. The use of clover as a perennial under-vine cover crop did not increase berry YAN. The application of foliar urea sprays may present an effective means by which vintners can easily increase must YANs and amino acid contents.
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