Soil improvers and growing media. Determination of pH has-tracked-changes There are two main changes

There are two main changes

either derived from experience or through calibration with existing lines that had a long history of satisfactory performance

BS EN 4342 is an international standard used for the Aerospace series

This part of BS 3900 supersedes BS 3900-0:1989+A1:1992

Soil improvers and growing media. Determination of pH has-tracked-changes There are two main changes1 Scope This European Standard specifies an instrumental method for the routine determination of pH in a suspension of soil improvers or growing media. This method is not applicable to liming materials and preformed materials such as mineral wool slabs and foam slabs. NOTE The requirements of the standard may differ from the national legal requirements for the declaration of the products concerned.