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

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Presentation transcript:

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

Intralaboratory precision Interlaboratory precision Within Between

 ICP vs colorimetry to analyze P  Calculated CEC  Salt pH  Combustion C and CaCO 3  Nitrate analysis  Scooping versus weighing  Hot-water and Mehlich-3 B  Micropipette method for soil texture

ICP vs colorimetry to analyze P

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

ICP vs colorimetric P

Calculated CEC

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

Ca Mg K

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

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

Acidity = 8 x (7.5 – SMP buffer pH)

Salt pH

1:1 line

Nitrate analysis

critical value

Combustion C and CaCO 3

Scooping versus weighing

M3 assumes 1.18 g / cm 3 M1 assumes 1.25 g / cm 3

% sand % OM g / cm 3

M3 assumes 1.18 g / cm % - 40%

1.7 cm 3 scoop & 1.18 g / cm 3

Hot-water and Mehlich-3 B

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

Micropipette method for soil texture

1:1 line