Changes in Norisoprenoid Levels with Long-term Nitrogen Fertilisation in Different Vintages of Vitis vinifera var. Riesling Wines
AbstractC13-norisoprenoids were measured in Riesling wines produced from the 1996, 1997 and 2003 vintages within thescope of a long-term nitrogen (N) fertilisation experiment. The wines were made from treatments of 0, 60 and 150kg N/ha; each treatment was repeated four times and arranged in a completely randomised design. N fertilisationled to lower TDN (1,1,6-trimethyl-1,2-dihydronaphthalene) concentrations, whereas the trend was for actinidol andÃŸ-damascenone to increase with increasing fertilisation and vitispirane was not affected by fertilisation. Yield,which was affected by N fertilisation, showed negative correlations with norisoprenoids in 1996 and 1997.Vitispirane, actinidol and TDN increased with storage time. The colder year, 1996, which had fewer sunshine hours,resulted in higher concentrations of ÃŸ-damascenone and lower concentrations of the norisoprenoids vitispirane,actinidol and TDN compared with 1997.
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