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Substrate depths

After reading some posts about root bound, older setups, and daydreaming
in class today I was wondering something.  

Will a deeper substrate help slow down/negate the tendency for very dense
root mats?  In nature the substrate is very deep and plants seem to do
fine for millions of years with no one uprooting them.  Would a substrate
thicker than about 4 inches help at all?  Somewhere in the 6-8 inch range

Why would I want to do this?  Just an idea to try something different and
I am very, very lazy so not having to worry about root bound substrates
every few years would be a huge load off my schedule :)

Just some idle questions to get the brain moving.
o    Mike Nielsen                                                        u 
m    Department of Geography         THE OPTIMIST BELIEVES WE LIVE IN    ? 
a    Harvill Bldg Box #2             THE BEST OF ALL POSSIBLE WORLDS;    w
r    Tucson, AZ 85721                THE PESSIMIST FEARS THIS IS SO      h 
e    mnielsen at u_arizona.edu                                              o