Yes, but that's a good thing. You are much more likely to burn your plant with fertilizer, than starving it. If you think about the typical environment most plants adapted to, you will not have a year's worth of N2, P, ... supplied once a year, but a constant, very low exposure through rain and continuous organic decay/production processes in the soil and above. For the most part, plants rely on osmosis, the capillary effect and evaporation to transport nutrients. Salt levels, including fertilizer, modify the osmotic costs and limits.