TY - JOUR T1 - Effects of Cultivar, Maturity, Cluster Thinning, and Excessive Potassium Fertilization on Yield and Quality of Arkansas Wine Grapes JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 260 LP - 264 DO - 10.5344/ajev.1987.38.4.260 VL - 38 IS - 4 AU - J. R. Morris AU - C. A. Sims AU - R. K. Striegler AU - S. D. Cackler AU - R. A. Donley Y1 - 1987/01/01 UR - http://www.ajevonline.org/content/38/4/260.abstract N2 - A study was established on Cabernet Sauvignon and Gewürztraminer, two French-American hybrid cultivars (Seyval and de Chaunac), and a Vitis aestivalis cultivar (Cynthiana) to determine their yields and quality responses to thinning to one cluster per shoot before anthesis and a high level of potassium fertilization (2.7 kg K2SO4/vine). The relationships between the development of percent soluble solids and the increase in juice pH values, as well as the decrease in fruit acidity, were examined for each of these five cultivars. Gewürtztraminer produced juice with the highest pH and lowest acidity, and Cynthiana produced fruit with the most acceptable pH and highest acidity values. The application of K fertilization and cluster thinning increased K and pH in fruit from some cultivars; however, these effects were not observed in all cultivars. ER -