Foliar Co-Applications of Nitrogen and Iron on Vines at Different Developmental Stages Impacts Wine Grape (<i>Vitis vinifera</i> L.) Composition.

Effect of Co-Application of N and Fe on Wine Grape Relative Content of Essential Amino Acids at Different Developmental Stages The synergistic application of N and Fe at different stages had a highly significant effect on the relative content of amino acids in berries ( Table 4 ), in which the N3Fe1 treatment showed a significantly higher content the content of L-Serine, L-Proline, L-Threonine, L-Aspartic Acid, L-Lysine, L-Histidine, L(+)-Arginine, Glycine, and L-Glutamic acid, and N3Fe2 treatment significantly increased the content of L-methionine, L-phenylalanine, L(+)-Arginine and L-Glutamic acid.

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