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Liming and Liming Materials

Liming and Liming Materials. Most Productive Soils. 9.0. 8.0. Basicity. pH value defines relative acidity or basicity. 7.0. Neutrality. 6.0. Acidity. 5.0. pH = - log[H + ]. 4.0. What Causes Soil Acidity?. Rainfall leaches basic elements (Ca ++ , Mg ++ , Na + , K + )

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Liming and Liming Materials

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  1. Liming and Liming Materials

  2. Most Productive Soils 9.0 8.0 Basicity pH value defines relative acidity or basicity 7.0 Neutrality 6.0 Acidity 5.0 pH = - log[H+] 4.0

  3. What Causes Soil Acidity? • Rainfall • leaches basic elements (Ca++, Mg++, Na+, K+) • Acidic parent material • granite more acidic than shale or sandstone • Organic Matter • OM decay produce H+ • Harvest of high yielding crops • most significant role

  4. Soil Acidity H+ Al3+ - - - - H+ clay - - H+ - - - - - H+ (Soil Solution) (Cation Exchange) H+ Ca2+ pH = - log[H+]

  5. How Lime Reduces Soil Acidity • A Ca2+ ion from the lime replaces two H+ ions on the cation exchange complex • The H+ ions combine with OH- to form water • Soil pH increases because the acidity source (H+) has been reduced

  6. CaCO3 + H2O Ca++ + HCO3- + OH- Displaces Al & H from Clay Breaks down to carbon dioxide + water Combines with H+ released from the clay or from Al-OH to form water Neutralizing Acidity with Lime

  7. How Lime Works - - - - H+ - clay - - - - - - CaCO3 (Lime) H+ Ca++ + HCO3- + OH- - - - - - clay - Ca2+ - - - - - + H2O + CO2 (Carbon Dioxide) (Water)

  8. How Lime Works - - - - Al+++ - clay - - - - - - CaCO3 (Lime) Ca++ + HCO3- + OH- - - - - H2O - clay - Ca2+ - - - - - Al+++ + 2H2O --> Al(OH)2+ + 2H+ Al(OH)2+ + H2O + CO2 (Carbon Dioxide) (Water)

  9. Lime Materials: Effectiveness is Determined: • Particle Size • Neutralizing Power

  10. 10 mesh 1/8” 3/16” 20 mesh 1/4” 100 mesh 1/2” 200 mesh 3/4”

  11. FINENESS PPI

  12. AgLime Mesh Size Specifications: Virginia Ground Limestone MeshGuar. to Pass 20 90% 60 50% 100 30% Pulverized Lime 20 95% 100 70%

  13. Neutralizing Power or Calcium Carbonate Equivalency(CCE) • CaCO3 set to 100. • All other materials compared to it.

  14. Neutralizing Value (CCE) of Pure Compounds

  15. Lime Neutralizing Power • Purity: • minimum calcium carbonate equivalency (CCE) of 85%

  16. Properties of various lime materials

  17. Dolomitic Calcitic Hydrated Burned Suspension Pelleted Ag Marl Which Lime Should I Use?

  18. Liming When is the best time to apply?

  19. Apply Lime Well Ahead of Planting

  20. Silt Loam Sandy Loam pH pH 7.0 7.0 2.5 tons 1.5 tons 6.0 6.0 5.0 5.0

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