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MHS Seminar: Tekan Rana- Dynamics of Tissue Nutrient Content in Mature Muscadines
November 2, 2020 | 2:00 pm - 3:00 pm
Dynamics of Tissue Nutrient Content in Mature Muscadines (Vitis rotundifolia cv. Carlos) in North Carolina
Tekan Rana, MHS Presentation
Under the direction of Dr. Mark Hoffmann, Dr. Brian Jackson, and Dr. Penelope Perkins-Veazie
Monday, November 2, 2020, at 2:00 pm
Tekan Rana, MHS Presentation
Under the direction of Dr. Mark Hoffmann, Dr. Brian Jackson, and Dr. Penelope Perkins-Veazie
Monday, November 2, 2020, at 2:00 pm
Join Zoom Meeting: https://ncsu.zoom.us/j/93855906572?pwd=eFd3ZmVuSVNtUS83Nnl4bzRRbHRvUT09
Meeting ID: 938 5590 6572
Passcode: 027330
Summary:
Muscadines (Vitis rotundifolia) are the native grape to the Southeast, traditionally used as a fresh market snack and for wine production. Before prohibition, North Carolina (NC) was the largest wine-producing state in the US, mostly shouldered by a large commercial muscadine industry. Today, the largest winery at the East Coast is Duplin Winery, which produces more than 450,000 cases of muscadine wine every year. In general, commercial muscadine production has increased in NC over the past 10 years, and covers more than 1,200 acres of commercial vineyards as of today in NC alone, with an economic impact of approx. $1 billion.
Muscadines (Vitis rotundifolia) are the native grape to the Southeast, traditionally used as a fresh market snack and for wine production. Before prohibition, North Carolina (NC) was the largest wine-producing state in the US, mostly shouldered by a large commercial muscadine industry. Today, the largest winery at the East Coast is Duplin Winery, which produces more than 450,000 cases of muscadine wine every year. In general, commercial muscadine production has increased in NC over the past 10 years, and covers more than 1,200 acres of commercial vineyards as of today in NC alone, with an economic impact of approx. $1 billion.
Until today, muscadine vineyard fertilizer programs, tissue sampling, and nutrient sufficiency ranges are based on anecdotal knowledge. While changes in grapevine in tissue nutrient content due to specific grapevine growth stages are well documented in European-style wine grapes (V. vinifera), basic questions remain as to when such changes occur in muscadines. However, optimized vine nutrition is critical for yield, must quality, and longevity of the vineyard, and tissue sampling is commonly used to assess vines’ nutrient status and subsequent fertilizer recommendation. The objectives of this study were: (1) Analyze a 2-year data set for potential differences in growth stage-related differences in muscadine tissue nutrient content of two muscadine cultivars (Noble) and (Carlos) over three different regions in NC and GA. (2) Assess the impact of tissue sample type and tissue sample location on tissue nutrient content in a mature muscadine vineyard (‘Carlos’). (3) Assess growth stage-related dynamics of tissue nutrient in a mature muscadine vineyard (‘Carlos’). For objectives (2) and (3), a two–year (2019-2020) muscadine field trial was conducted in Wagram, NC. Tissue samples (whole leaf and petiole) from two positions (opposite of the cluster and first fully mature leaf on a shoot) were collected during bloom, véraison and post-harvest. Samples were sent to the North Carolina Department of Agriculture and Consumer Service (NCDA&CS) for nutrient analysis and data were analyzed with SAS (V9.4 for windows). Our analysis shows that several elements, such as nitrogen or calcium are higher than the officially recommended sufficiency rates over the whole season, while sulfur or zinc are lower. The content of N, P, and K continuously decreased over the season in whole leaf, while Ca, Mg, and S decreased from bloom to post-bloom and again increased at véraison. When comparing petioles to whole leaf samples, higher content of nitrogen, sulphur, iron and other elements were found in whole leaf samples, while petioles showed consistently higher phosphorus, potassium, calcium, and others. Coefficient of variance (CV%) had shown that petiole samples had higher CV% for most grapevine macronutrients. However, a lower CV% for whole leaf samples could indicate higher reliability for a grapevine phenology based tissue sampling method.