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Prairie Soil Fertility



There have been several comments made recently about soil fertility and how
natives 'best' survive in soil of low fertility.  On the other hand, we have
been told that prairie soils are among the 'richest soils in the world'.  This
seems to be contradictory.  Perhaps it depends on 'what part of the prairie you
live', for example Illinois prairies should have better soils than western
Nebraska due to the rainfall amounts.
My reason for asking is I am restoring former  areas of Highly Erodable Soil,
where there has been significant erosion and little if anything has grown there
intentionally planted or otherwise.  I have added large amounts of grass
clippings and leaves and tilled them into the soil.
I would appreciate comments etc. on this fertility issue.  How much fertility is
too much?  How do you measure fertility?
thanks

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