I think the idea behind no-till is that tilling disturbs soil microbes, and if you keep tilling they go away. This year there is a microbiome project and it is clear that microbes in soil--and in us--are more important than anyone ever imagined.
This is an old article, but I think the instructions on how to proceed are still valid. No-till is a basic permaculture concept.
http://davesgarden.com/guides/...
