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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

Dolomite or Calcite Aglime: What’s Best?

Tim Wagar, Regional Extension Educator

definition of ag liming material
Definition of Ag Liming Material
  • Contains Ca and Mg compounds that can neutralize soil acidity
  • Limestone
  • Quicklime
  • Hydrated lime
  • Marl
  • Shells
  • Byproducts
agricultural limestone
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
agricultural limestone quality
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

summary
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