Soil Ringtest and QA/QC information

The Soil Ringtest program runs every three years. The procedure is as follows:

• Informing the possible participating labs and NFCs (every third year - e.g. 2021, 2024, 2027, ...)
• Registration of the participants via internet (April)
• Distribution of the test samples and the invoice (April)
• Data submission by the labs (September)
• Deadline of data submission (beginning of October)
• Results (October)
• Re-qualification process finished (May - next year)
• Re-qualification confirmed (with an extra sample set)

When a lab did not qualify and did not make efforts to improve data quality, the PCC will send a letter to the respective National Focal Centre informing it that the data may not be used for evaluations at European level.

The ringtest is financed by a participation fee and preparation of ringtest samples by the participants. Results of the ringtests can be found under ringtest reports.

• Webinterface for registration and data submisson
• Evaluation procedure
• Parameters and evaluation limits
• Requalification procedure
• Status of re-qualification of latest test