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A1 3+ > H + > Ca 2+ > Mg 2+ > K + = NH 4 + > Na +

Common elements on the CEC (cations) or AEC (anions). Strength of adsorption. A1 3+ > H + > Ca 2+ > Mg 2+ > K + = NH 4 + > Na +. H 2 PO 4 - > SO 4 2- > NO 3 - = Cl - > HCO 3 -. Acids + Bases = CEC. % Base Saturation. bases

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A1 3+ > H + > Ca 2+ > Mg 2+ > K + = NH 4 + > Na +

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  1. Common elements on the CEC (cations) or AEC (anions) Strength of adsorption A13+ > H+ > Ca2+ > Mg2+ > K+ = NH4+ > Na+ H2PO4- > SO42- > NO3- = Cl- > HCO3-

  2. Acids + Bases = CEC

  3. % Base Saturation bases Base saturation % = ----------------- x 100 CEC 12 BS % = -------------------- x 100 = 50% BS 24 meq/100g acid Acid saturation % = ----------------- x 100 = 50% Ac CEC

  4. NC Soils Havlin et al, 2007

  5. NC Soils Havlin et al, 2007

  6. NC Soils Havlin et al, 2007

  7. % of CEC

  8. Index of nutrient availability in soil

  9. Index ratings and crop response

  10. Nutrient Response Field Trials Soil Test P

  11. Equation Reference No. Equation 1 0.0467 I² - 13.0 I + 900 = lbs/acre 2 0.0202 I² - 6.37 I + 500 = lbs/acre 3 0.0100 I² - 3.50 I + 300 = lbs/acre 7 0.0100 I² - 3.25 I + 250 = lbs/acre 8 0.0173 I² - 4.64 I + 250 = lbs/acre 9 0.0102 I² - 3.00 I + 220 = lbs/acre 13 0.0120 I² - 2.90 I + 165 = lbs/acre 14 0.0116 I² - 2.75 I + 150 = lbs/acre 15 0.0140 I² - 3.20 I + 150 = lbs/acre 23 0.0005 I² - 0.135 I + 9 = lbs/1000 ft² 24 0.0007 I² - 0.160 I + 8 = lbs/1000 ft² 25 0.0005 I² - 0.130 I + 6.5 = lbs/1000 ft²

  12. Maintain Soil Test History Soil Test P, ppm

  13. John Havlin Soil Science NC STATE havlin@ncsu.edu 919-740-9743

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