Nitrogen Critical Level in Leaves in ‘Chardonnay’ and ‘Pinot Noir’ Grapevines to Adequate Yield and Quality Must

The nitrogen (N) critical level in leaves and maximum technical efficiency (MTE) doses contribute to the grape yield, must quality, fertilizers rationalization. This study aimed define sufficient ranges levels obtain high yields quality grapevines grown sandy soil a subtropical climate. ‘Chardonnay’ ‘Pinot Noir’ were subjected annual application of 0, 10, 20, 40, 60, 80 kg N ha−1 vineyard. concentration at flowering veraison, yield chemical parameters (total soluble solids—TSS, total titratable acidity—TTA anthocyanins—TA) evaluated. was different between cultivars, but this not observed veraison. It possible estimate MTE for grapevines, evaluated growing seasons. In range higher probability leaves, TSS TTA variables showed opposite responses, both cultivars. proposes red white