Submitted to: HortScience
Publication Type: Abstract Only
Publication Acceptance Date: 2/15/2008
Publication Date: 7/1/2008
Citation: Schreiner, R.P., Lee, J. 2008. Nutrient response of ‘Pinot noir’ in a sand-culture vineyard. HortScience. 43:1146. HortScience.
Technical Abstract: Nitrogen, phosphorus and potassium supply to grapevines (Vitis vinifera, cv. ‘Pinot noir’) grown in sand were each manipulated to better understand how nutrients influence the growth, physiology and fruit quality attributes of this winegrape variety. In 2006 and 2007, four rates of N, four rates of P, or four rates of K were supplied to vines with other plant nutrients held constant. Effects on vine growth (shoot length, leaf area) were not significant in either year, but vines receiving low N had lower N concentrations in leaves and petioles and lower SPAD readings in both years. Low N vines also had lower K concentrations in petioles and higher P concentrations in petioles in 2007. P and K treatments did not alter P and K status in 2006, but did so in 2007. Effects of nutrient treatments on leaf gas exchange, chlorophyll fluorescence, leaf water potential or soil moisture were generally not significant in either year. High levels of inflorescence necrosis occurred in both years, although it was exceptionally variable from vine to vine. The incidence of flower necrosis was lower in those vines receiving less N in 2006, but this did not occur in 2007. Fruit was dropped from all vines in 2006 to minimize potential effects of crop load differences on subsequent growth and physiology of these vines. Since nutrient treatments did not affect flower necrosis in 2007, fruit clusters were retained and carried to maturity. N, P or K treatments did not effect fruit yield, cluster weight, or berry size. Juice soluble solids, titratable acids, and pH were also unaffected by nutrient treatments in 2007. However, juice P concentrations were lower in vines receiving less P, and juice P was correlated to leaf and petiole P. Juice K was lower in both low N and low K vines, but juice K was correlated to N status of vines (SPAD & leaf/petiole N). Effects of nutrient treatments on other fruit quality parameters, including nitrogen, will be discussed.