Thanks for writing. The answer really depends on your soil. If you have good, rich soil, a fertilizer may not help much, if at all. If your soil is lacking one nutrient more than others, you'd want to find a fertilizer that has a high amount of that nutrient.
Your Lucas County Cooperative Extension Service should be able to give you more information about testing your soil; they may even be able to do it for you. Contact them at: http://lucas.osu.edu/
One note: Fertilizing your trees to get them to grow faster can also make them weaker and more susceptible to injury from wind, winter ice, pests, and diseases.
---Justin, Senior Garden Editor, BHG.com "