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it all boils down to humus
humus levels in the soil can take a decade to create
via micro-bacterial action... but only a few years if the
earthworm population is encouraged as the excrement from worms is the fast method of producing it.
HUMUS will hold ten times its weight of water but when you
don't farm organically...and by that i mean ...your not tilling in
tons of organic matter for the worms to eat and convert to humus....
you basically have a potential "run off " situation because chemical
fertilizers do not add any organic matter to the soil at all .
part of the problem is the continued practice of monoculture
which is increasing the use of both pesticides and herbicides
that also enter the ecosystem.
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