2nd AFRILAB meeting Zoom platform, 30 September - 1 - 8 October (English) Christian Hartmann, IRD, France and Michael Watts (BGS, United Kingdom)

1. Christian Hartmann (IRD - France)
Michael Watts (BGS - United Kingdom)
ITEM 2
How to take action after participating in a PT?

2. Laboratory objective =
produce GOOD QUALITY DATA

3. Accuracy = how closely you are from your goal.
Precision = how close are the different replicates.

4. Increasing precision
Increasing
accuracy
Accuracy = how closely you are from your goal.
Precision = how close are the different replicates.

5. Increasing precision
Increasing
accuracy
Accuracy = how closely you are from your goal.
Precision = how close are the different replicates.
Increasing
performance

6. How can we measure the lab performance?
PROFECIENCY TESTING
(inter laboratory comparison)

7. 3 soil samples (A, B, C)
sent to 100 soil labs
around the world
(pH; carbon, nitrogen, avail. P ‘Olsen’-’Bray 1’- ‘Bray 2’, exch. cations, etc… )
GLOSOLAN:
Labs sent the analytical results to GSP head quarter
Statistical analysis
GLOSOLAN sent back to each lab a document
showing lab perfomance (Z score) for each parameter.

8. Soil name:
Code of the parameters analysed
Z score:
-2 < Z < +2 Satisfactory
-etc…

9. Soil name:
Code of the parameters analysed