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  1. Soil Testing

    https://delaware.osu.edu/program-areas/master-gardener-volunteers/soil-testing

    calcium (Ca), magnesium (Mg), pH, cation exchange capacity, lime requirement index and base saturation. ...

  2. USDA National Ag Stats, County estimates

    https://delaware.osu.edu/node/376

    http://www.nass.usda.gov/Statistics_by_State/Ohio/Publications/County_Estimates/index.asp ...