Fertilizing in autumn? With what?

Last year there was a small discussion on this list about the pros and 
cons of fertilizing woody plants in late fall. I quote a bit (from my own 
posting) at the end of this note.

My question here is, assuming I am going to apply nitrogen fertilizer 
after the leaves fall, what should I use? Can anyone tell me the 
advantages or disadvantages of various N sources, for example
ammonium nitrate, ammonium sulfate, potassium nitrate, urea, etc.

My soil is well-drained clay, neutral pH, and the soil will be cold and 
wet.

Thanks

from last year:
>I have read that fertilizing woody plants with nitrogen in the autumn 
>*after* they have gone dormant is a good thing. The claim is that the 
>roots are still active and absorbing nutrients and storing food, which 
>will be available in spring and give the plants an extremely good start. 
>
>And after above-ground growth has ceased, there is little or no 
>danger of provoking soft, late growth. That's the theory, as I 
>understand it anyway.

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