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New fact sheet reporting relationships between soil test extractants published by Culman Lab

June 18, 2019

The Soil Fertility Lab has published a fact sheet reporting their results investigating the relationships between Mehlich-3, Bray P, and Ammonium Acetate soil test extractants in the Tri-State Region.

Summary of Findings

  • Soil samples in Ohio and Indiana were collected from a diverse range of fields and analyzed for Mehlich-3, Bray-P, and ammonium acetate extractable nutrients for phosphorus (P), potassium (K), calcium (Ca), and magnesium (Mg).
  • Mehlich-3 P values were highly related to, but 35 percent higher than Bray P values.
  • Mehlich-3 K values were highly related to, but 14 percent higher than AA-K values.
  • Mehlich-3 is a reliable extractant and will be the basis for updated fertilizer recommendations.

Full fact sheet can be found HERE