Barry, While there is more I would expand about on the article I will currently keep my thoughts to just two here. 1-Humus depletion, etc... The problem isn't necessarily that they break down the OM so fast it doesn't have time to turn into Humus, it is that there isn't a balanced carbon input anymore and, over time, the humus (which contains/stores carbon & is used as a food source) runs out. Think of it like this. Microbes are eating a meal. They like, actually they need, a balanced meal with meat, bread, and veggies. When you fertilize with synthetic ferts you provide the veggies, but not the bread. Thus, they eat the veggies, but to be balanced, they also eat whatever bread is already in the soil. Eventually, all that is left in the soil are the veggies, and not enough bread or meat. Because all you are adding are the veggies. 2-N-fixing bacteria... Why/how do the N-fixing bacteria get "out competed"? Hint: I don't believe that they do other than the fact they they too, can run out of "bread". Second hint: Why do they fix N in the first place? I don't know why this is a new perspective for you. I have been stating this angle to the people of this forum since my salt fertilizer doesn't kill microbes (it's actually food) thread on 08-18-2008.