Fig. 3
From: Vine nitrogen status and volatile thiols and their precursors from plot to transcriptome level
N-tester measurements, as an indicator of vine nitrogen status in Bordeaux (a and c) and Sancerre (b and d) vineyards in 2013 and 2014. This device measures the intensity of the leaf blade color which is in relation with chlorophyll content. All data are presented as the mean of four biological replicates. Different letters indicate significant differences. Error bars indicate Standard Error (SE). Statistical significance was determined by Student’s t test (p value ≤ 0.05)