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…