The ratio of Nitrogen : Phosphorus : Potassium (N-P-K) doesn't matter a whole lot for home tobacco growing. Agricultural Extension Services in tobacco growing states issue recommendations that vary from one growing region to another, and vary from one tobacco variety to another within a growing region. That is important with regard to minimizing the grower's cost as well as run-off from extensive acreage of tobacco. Those considerations are not particularly meaningful for a small home grow.
Whether a fertilizer is 0.5-0.5-0.5 or 1-1-1 or 10-10-10 or 20-20-20 determines only how much of that preparation is to be applied to a given growing plot. I regularly use a 10-10-10 preparation of low-chloride vegetable fertilizer near transplant time (at the application rate indicated for tomatoes), and never add more fertilizer later in the growing season, since late nitrogen application delays maturation of the tobacco leaf. The only exception I make is if I encounter a flooding rain storm within a week or two of my fertilizer application, in which case I re-apply fertilizer at half the initial rate.
I should note that my tobacco growing is in the dirt, outdoors. In a different growing environment (e.g. hydroponic, grow bags, tiny pots, drip-irrigated, etc.), the requirements can be quite different.
Bob
