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Median

Median. Median Absolute Deviation. MAD. % Relative Median Absolute Deviation. %RMAD = . MAD / median x 100. Within. Intra laboratory precision. Between. Inter laboratory precision. ICP vs colorimetry to analyze P. Calculated CEC. Salt pH. Nitrate analysis. Combustion C and CaCO 3.

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Median

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  1. Median Median Absolute Deviation MAD % Relative Median Absolute Deviation %RMAD = MAD / median x 100

  2. Within Intralaboratory precision Between Interlaboratory precision

  3. ICP vscolorimetry to analyze P • Calculated CEC • Salt pH • Nitrate analysis • Combustion C and CaCO3 • Scooping versus weighing • Hot-water and Mehlich-3 B • Micropipette method for soil texture

  4. ICP vscolorimetry to analyze P

  5. ICP vs colorimetric P ICP labs = 39 colorimetric labs = 21

  6. ICP vs colorimetric P

  7. ICP vs colorimetric P

  8. Calculated CEC

  9. Calculated CEC ? 1 M NH4OAc CEC at pH 7 = sum of bases + acidity

  10. Mg Ca K

  11. Exchangeable acidity = 12.6 – (1.64 x soil pH) – (0.48 SMP buffer pH)

  12. Exchangeable acidity = 12 x (7 – SMP buffer pH)

  13. Acidity = 8 x (7.5 – SMP buffer pH)

  14. Salt pH

  15. 1:1 line

  16. Nitrate analysis

  17. critical value

  18. Combustion C and CaCO3

  19. Scooping versus weighing

  20. M1 assumes 1.25 g / cm3 M3 assumes 1.18 g / cm3

  21. g / cm3 g / cm3 % OM % sand

  22. + 40% M3 assumes 1.18 g / cm3 - 40%

  23. 1.7 cm3 scoop & 1.18 g / cm3

  24. Hot-water and Mehlich-3 B

  25. Limit of quantification = 0.05 mg/L 10 g 20 mL 2 g 20 mL

  26. Micropipette method for soil texture

  27. 1:1 line

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