Charissa Smith makes the comment that "Many soils have
produced food for years. The minerals in those foods were
eaten long ago."
on average each square mile of US soil is
losing 121 tons of disolved minerals and 340 tons of sediment
per year ... This breaks down to about 1400 lbs of minerals
lost per acre per year via leaching and erosion.
A 150 bushel corn harvest
removes less than 250 lbs of minerals (i.e. elements other
than C, H and O).
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