Table 2. The effect of nitrogen (NO3
-
) concentration or the NO3
-
/NH4
+
molar ratio in the nutrient solution on the content of rosmarinic acid (RA) in sweet basil (O. basilicum L. cv. Genovese) grown
hydroponically and harvested at full bloom seven weeks after transplanting. In experiment 2, total nitrogen concentration was 10.0 mol m-3
. Mean values of four replicates ( SE), each consisting of
four plants. The effects of N concentration or the NO3
-
/NH4
+
ratio, plant organ and their interaction were significant at P≤0.01 (**) or P≤0.001 (***) according to ANOVA. Values followed by
different letters differed significantly at 5% level.