Foliar application of urea to Tempranillo vines increased the amino acid concentration of the must.

The aim of this study was to investigate the impact of fertilisation with foliar urea of var. Tempranillo on the concentration of amino acids in must and on their evolution during the final stage of grape ripening. Foliar urea fertilisation increased the concentration of amino nitrogen, ammonium nitrogen and yeast assimilable nitrogen (YAN) in Tempranillo must.