I am a pretty hard core organic gardener, and actually freshly chipped brush is high in nitrogen especially if it is chipped with leaves. The cambium layer under the bark has lots of nitrogen. The carbon does eventually offset the nitrogen, nothing a little urine cannot fix. If that is not your style chicken manure is very high in N, so is good ole fish fetilizer too. Also, one of my fav thing to do with excess wood waste is to pile it up, bury it, and create Hugelkultur style hills. Gooder stuff, no need to chip nuttin.
My pile was left by the previous owner. It's right in a spot I want to mow and it's tamarack brush. I'll probably rot into the ground long before it will....
It is the microbes that are decaying the wood that temporary depletes the soil of nitrogen so I stand behind my comment. You might find this article interesting: DecAID - Decayed Wood Advisor
I found this as a better description of a 'Rick' I hope this defines the discussion better: Click here for video
