Agroscope investigated the efficiency of nitrogen fertilisation via foliar urea application at veraison with the aim of raising the yeast assimilable nitrogen (YAN) concentration in the musts.

The observations were conducted over three vintages on two grapevine cultivars in several pedoclimatic conditions of the Leman wine region, Switzerland. Knowing that the YAN in the must plays a key role in wine quality, the aim of this study was finding the main parameters affecting the final YAN level in order to better control them.

Keywords: terroir, yeast assimilable nitrogen YAN, leaf urea fertilisation, wine quality, terroir

Paper presented at the XI International Terroir Congress, July 2016, McMinnville, Oregon (USA).  

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