Instituto de Ciencias de la Vid y del Vino (CSIC, Gobierno de La Rioja, Universidad de La Rioja), Logroño, Spain.
J Sci Food Agric. 2023 Aug 15;103(10):4826-4837. doi: 10.1002/jsfa.12550. Epub 2023 Mar 23.
Grape nitrogen composition directly affects the development of alcoholic fermentation and also influences the final wine aromatic composition. Moreover, different factors influence grape amino acids composition, such as rate and timing of nitrogen application. The aim of this study was to determine the influence of three doses of urea, applied at two different phenological stages (pre-veraison and veraison), on the nitrogen composition of Tempranillo grapes during two consecutive seasons.
Urea treatments did not affect vineyard yield, oenological parameters of the grapes and yeast assimilable nitrogen. However, amino acids concentration in the musts increased at both moments of urea application (pre-veraison and veraison), but the lower urea concentrations and sprayed at pre-veraison improved most of the amino acids in the musts, during two vintages. Moreover, when the year was rainy, the higher dose treatment (9 kg N ha ) applied at pre-veraison and veraison improved the amino acid concentration in the must.
Foliar applications of urea could be an interesting viticulture practice in order to increase the amino acids concentration in Tempranillo musts. © 2023 The Authors. Journal of The Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
葡萄中的氮成分直接影响酒精发酵的发展，也会影响最终葡萄酒的香气组成。此外，不同的因素会影响葡萄氨基酸的组成，例如氮的施用量和时间。本研究旨在确定在两个连续的季节中，在两个不同的物候期（转色前和转色期）施用三种剂量的尿素对 Tempranillo 葡萄氮成分的影响。
尿素处理不影响葡萄园的产量、葡萄的酿酒参数和酵母可同化氮。然而，在尿素施用的两个时期（转色前和转色期），葡萄汁中的氨基酸浓度都会增加，但在两个年份中，较低浓度的尿素在转色前喷施都提高了葡萄汁中的大多数氨基酸。此外，在多雨的年份，在转色前和转色期施用较高剂量（9kgNha）的处理提高了葡萄汁中的氨基酸浓度。
叶面喷施尿素可能是提高 Tempranillo 葡萄汁中氨基酸浓度的一种有趣的栽培方法。© 2023 作者。《食品科学杂志》由 John Wiley & Sons Ltd 代表化学工业协会出版。
