Depends on what nutrients your using.
Me personally I use flower power nutrients which has high primary nutrient ratios (nitrogen, phosphorus, and potassium) its ratios for the bloom side are 15-6-30.
However I like using a blooming booster as well which would typically contain no nitrogen and have a ratio of 0-20-20, 0-27-27, or 0-15-35.
The booster from flower power I believe is 0-27-27 the current booster im using now has a ratio of 0-15-35.
Fox farm product like open sesame, beastie blooms, and cha Ching contain a ratio of 9-58-10 also very slightly.
So to speak you do want nitrogen still, however you dont want to much or to little nitrogen