Not responding to anyone in particular in this "debate"\but
googling Chemical fertilizer effects on soil microbes
brought a lot of interesting stuff (good scientific word: stuff)

For great general information ( and there is a LOT of info
he

www.answers.com/topic/fertilizer

I didn't read much of the blog/opinion sites.
There is a great deal of study being done in China.
I found these of interest:

www.agnet.org/library/tb/174/

(Combined use of Chemical and Organic Fertilizer and/or Biofertilizer)

also:

http://www.organiclandcare.org/educa...ertilizers.pdf

Happy researching
Emilie]
NorCal