Veraison leaf blade nitrogen (N) concentrations where key vine performance variables were reduced by 30% for Pinot noir grapevines grown in microplots at varying N rates from 2012 to 2014. Veraison leaf blade nitrogen (N) concentrations where key vine performance variables were reduced by 30% for Pinot noir grapevines grown in microplots at varying N rates from 2012 to 2014. Data were derived from regressions of each variable relative to the Control (100% N) treatment against leaf blade N concentrations at veraison. R. Paul Schreiner et al. Am J Enol Vitic. 2018;69:45-58 ©2018 by the American Society for Enology and Viticulture