Anyone here use Pure Blend Pro?

Have some signs of N deficiency starting after 2.5 weeks of vigorous growth. I need to add some nutrients and only have Pure Blend Pro on hand. It is listed as 3-1.5-4. Anyone use this before? Any alternative suggestions if this one does not do the job?

Cool. That is what I am looking for. My plants are in the beginning veg stage right now, so I want to get them started out right. I had this on hand from a hydro veg grow. Looks like a trip to the nursery.