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Dolomite or Calcite Aglime: What’s Best?

Dolomite or Calcite Aglime: What’s Best?. Tim Wagar, Regional Extension Educator. Definition of Ag Liming Material. Contains Ca and Mg compounds that can neutralize soil acidity Limestone Quicklime Hydrated lime Marl Shells Byproducts. Agricultural Limestone.

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Dolomite or Calcite Aglime: What’s Best?

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  1. Dolomite or Calcite Aglime: What’s Best? Tim Wagar, Regional Extension Educator

  2. Definition of Ag Liming Material • Contains Ca and Mg compounds that can neutralize soil acidity • Limestone • Quicklime • Hydrated lime • Marl • Shells • Byproducts

  3. Agricultural Limestone • Mixture of - Calcite CaCO3 and Dolomite CaCO3 + MgCO3 • Calcite - 40% Ca and 0-0.6% Mg • Dolomite – 21.7% Ca and 13.1% Mg • Ca:Mg ratio of crops is closer to that of dolomite

  4. Agricultural Limestone Quality • Laboratory measurement of chemical effectiveness – % Total Nuetralizing Power (% TNP) • Particle size from crushing/grinding – (Fineness Index) • (Fineness Index) X (% TNP) = % ENP • % ENP X 2000 lbs X % Dry Matter = Pounds of Effective Neutralizing Power/ton

  5. Liming Materials – Winona Co., 1991

  6. Liming Materials Yield – Winona Co., 1991

  7. Aglime Effects on Alfalfa, Rochester Center Plots - 2000

  8. Aglime Effects on Alfalfa - 2001

  9. Aglime Effects on Alfalfa - 2002

  10. Summary • No agronomic evidence that Mg levels in dolomite lime are detrimental to alfalfa • Should be more concerned about inducing grass tetany in cattle from forages grown on soil with the exclusive use of calcitic lime • No agronomic or economic reason to “import” purported calcitic lime

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