TY - JOUR T1 - Influence of Vineyard Nitrogen Fertilization on the Concentrations of Monoterpenes, Higher Alcohols, and Esters in Aged Riesling Wines JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 275 LP - 284 DO - 10.5344/ajev.1993.44.3.275 VL - 44 IS - 3 AU - DOUGLAS R. WEBSTER AU - CHARLES G. EDWARDS AU - SARA E. SPAYD AU - JOHN C. PETERSON AU - BARBARA J. SEYMOUR Y1 - 1993/01/01 UR - http://www.ajevonline.org/content/44/3/275.abstract N2 - Riesling wines produced in 1986 and 1988 from vines fertilized with 0, 56, 112, or 224 kg N/ha/year were analyzed in 1991 for free and bound monoterpenes, higher alcohols, and esters. Solid phase extraction using AmberliteĀ® XAD-2 resin was employed in the isolation of volatile compounds identified by gas-liquid chromatography/mass spectrometry. Relative recoveries of all compounds ranged from 79% to 112% with coefficients of variation generally less than 7%. Vineyard N fertilization affected the concentration of some free or bound monoterpenes in the aged wines, depending on the monoterpene and vintage. Concentrations of amyl alcohols and 2-phenylethanol decreased with increasing N fertilization while isobutanol and cis-3-hexen-1-ol showed no differences. Concentrations of 1-butanol, trans-3-hexen-1-ol, benzyl alcohol, and the majority of esters increased (p < 0.05) with increased N fertilization. Sensory analysis using triangle difference tests indicated that wines made from grapes fertilized with 0 or 224 kg N/ha significantly differed (p < 0.01). ER -