Evaluation of National Proficiency Testing (PT) Provision in the Scheme of Soil Analysis on PH, Organic Carbon, Total Nitrogen and Available Phosphorus Based On the Same Soil Sample Exchange in Ethiopia

Authors: Bedassa M* and Redi M

DOI: 10.23880/ijoac-16000260

Volume 7, Issue 3

Abstract

Proficiency testing (PT) is to monitor the quality of their analytical results, demonstrating analytical competence, developing and training analysts, and the validation of methods and instruments as stipulated in ISO/IEC 17025 in Ethiopia. Composite surface soil samples at the depth of 0-20 cm were collected from the experimental sites. The sample was air dried, grained using mortal and pestle and sieved < 0.5mm mesh size. Soil pH, organic carbon, total N and available P were determined at respective agricultural research soil Laboratories following standard lab procedures in fifteen soil laboratories of EIAR & regional centers participated in the PT organized for 2022. The results of the analytical results were evaluated by calculating Z scores.

Keywords: Homogeneous; ISO/IEC; Proficiency Testing and Z Scores

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