On Wed, 7 Sep 2016 11:23:29 -0400, songbird wrote:

the more diverse you can make a garden soil the
more resilience you have for handling different
conditions and a balance between the good kinds and
the kinds which can cause diseases.

While it's all complex, I think you summarized the problem set pretty well,
which is the more diverse you can make the soil, the better because all
sorts of "minor" good things happen, and most bad things are diluted, so to
speak.