Re: fertilizers, Please help

Many of the plants I grow are acid loving plants and non tolerant of Nitrogen
in the form of Ammonia.  I have found it really hard to find fertilizers that
don't have most of their nitrogen in the form of Ammonia.  I found a bulb
fertilizer that sounds good.  The nitrogen is 75% from urea and only 25% from
ammonia.  Do you think that this would be good to use on Rhododendrons and
Japanese Iris.  Luckily Rhododendrons don't need a lot of feeding, but I
killed off most of my Japanese Iris because I couldn't find a fertilizer with
out ammonia Nitrogen and resorted to what I could find.  Since then I just
haven't ferilized the survivors.

The pH of my soil appx 4.5.  I was thinking I should put some lime on some of
my Clematis, and other non acid loving plants, but was afraid of the run off
onto the Rhododendrons which are my specialty.  Would the runoff hurt them
with my pH so low?  How about my acid loving Irises?  Also will the bulb
fertilizer be likely to cause an adverse reaction due to Calcium or something.
I had a rudimentary soil test done at a nursery because there are no labs
that do it here and the county extension doesn't do it either.  They said my
soil was very low in minerals.  I have been adding Epson Salts which have
helped many of my plants, but could there be other minerals that I should add
for Rhododendrons and my Iris?  My other plants are thriving so I am not
worried about them.

Would appreciate any advice.
Thanks
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