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fertilizer toxcity

To anyone with an opinion on: What about build up of high levels of
Calcium,Magesium,potassium etc..I was wondering if this is why some top
growers all of sudden can't get those huge hummers.  I think that as the
years go by the soil reaches optimum where everything is right in availble
form humus etc.. for optimum growth.  You have major success.  But growing
these monsters in the same place year after year has to deplete minerals we
don't even know about let alone the high levels  have to hinder the
microbes and or soil life.  A fallow plot in rotation might keep  some
sustainable action.

I know I need to get life, bad case of pumpkins on the brain need beer.
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