FprEN 17731

Growing media - Methods for the determination of the electrical conductivity, pH, dry matter content, quantity, total copper and zinc content, water soluble chloride content, and CaCl2/DTPA extractable nitrogen, P2O5 and K2O content FprEN 17731

Publication date:   Jan 29, 2026

Scope

This document specifies references to methods to be used for the determination of specific parameters in growing media, but does not contain the methods themselves. The specific parameters in this document are:
— electrical conductivity;
— pH;
— dry matter content;
— quantity;
— total copper and zinc content;
— water soluble chloride content;
— nitrogen, P2O5 and K2O content extractable by CaCl2/DTPA
This document is applicable to the fertilizing product blends where a blend is a mix of two or more fertilising products belonging to the categories of fertilizers, liming material, soil improvers, growing media, inhibitors and plant biostimulants, and where growing media are the components with the highest percentage in the blend by mass or volume, or in the case of products in liquid form by dry mass. If the growing media are not the components with the highest percentage in the blend, the European Standard relevant to the component with the highest percentage in the blend applies. In case a blend is composed of fertilising products mixed in equal quantities, the user of the standard decides which standard to apply.
NOTE A growing medium consists of a single bulky (volume-building) component or a mix of bulky (volume-building) components (for example peat, wood fibres, coconut coir, compost, expanded perlite).

Related legislation

Legislation related to this standard