oSIST prEN 17731:2026

SLOVENSKI STANDARD
01-april-2026
Rastni substrati - Metode za določanje električne prevodnosti, pH, suhe snovi,
količine, celotnega bakra in cinka, klorida, topnega v vodi, ter dušika, P2O5 in
K2O, dobljenih z ekstrakcijo s CaCl2/DTPA
Growing media - Methods for the determination of the electrical conductivity, pH, dry
matter, quantity, total copper and zinc content, water soluble chloride content, and
CaCl2/DTPA extractable nitrogen, P2O5 and K2O content
Bodenverbesserungsmittel - Bestimmung spezifischer Parameter
Supports de culture - Vue d'ensemble des méthodes pour la détermination de la
conductivité électrique, du pH, de la matière sèche, de la quantité, de la teneur total en
cuivre et en zinc, de la teneur en chlorures solubles dans l'eau, de l'azote
extractable/CaCl2/DTAPA, et de la teneur en P2O5 et K2O
Ta slovenski standard je istoveten z: prEN 17731
ICS:
65.080 Gnojila Fertilizers
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2026
ICS 65.080 Will supersede CEN/TS 17731:2022
English Version
Growing media - Methods for the determination of the
electrical conductivity, pH, dry matter, quantity, total
copper and zinc content, water soluble chloride content,
and CaCl2/DTPA extractable nitrogen, P2O5 and K2O
content
Supports de culture - Méthodes pour la détermination Kultursubstrate - Verfahren zur Bestimmung der
de la conductivité électrique, du pH, de la matière elektrischen Leitfähigkeit, des pH-Werts, der
sèche, de la quantité, de la teneur totale en cuivre et en Trockensubstanz, der Menge, des Gesamtkupfer- und -
zinc, de la teneur en chlorure soluble dans l'eau et de la zinkgehalts, des Gehalts an wasserlöslichem Chlorid
teneur en azote, en P2O5 et en K2O extractibles par und des Gehalts an mit CaCl2/DTPA extrahierbarem
CaCl2/DTPA Stickstoff, P2O5 und K2O
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 223.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17731:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Sampling and sample preparation . 6
4.1 Sampling . 6
4.2 Sample preparation . 6
5 Determination . 6
5.1 Determination of the electrical conductivity . 6
5.2 Determination of the chloride content . 6
5.3 Determination of pH . 6
5.4 Determination of dry matter . 6
5.5 Determination of the nitrogen, P O and K O content extractable by CaCl /DTPA . 6
2 5 2 2
5.6 Determination of the aqua regia soluble copper and zinc content . 7
5.7 Determination of quantity . 7
Bibliography . 10

European foreword
This document (prEN 17731:2026) has been prepared by Technical Committee CEN/TC 223 “Soil
improvers and growing media”, the secretariat of which is held by NEN.
This document is currently submitted to the CEN Enquiry.
This document will supersede CEN/TS 17731:2022.
CEN/TS 17731:2022:
— The title has been revised;
— The quantity requirements have been added in the Introduction;
— An applicability statement has been included in the Scope;
— Clause 2, Normative references, has been updated;
— Annex ZA has been added.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZA, which is an integral part of this
document.
Introduction
Different product functions warrant different product safety, quality and quantity requirements adapted
to their different intended uses. EU fertilizing products have therefore been divided into different product
function categories (PFCs), which are subject to specific safety, quality and quantity requirements, as
specified in the Regulation (EU) 2019/1009 [1].
Growing media have been classified as PFC 4. The specific safety, quality and quantity requirements in
relation to specific parameters are specified in this document, as well as normative references of the test
methods to be used to assess the compliance with the related requirement.
1 Scope
This document refers 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 include:
— electrical conductivity;
— chloride;
— pH;
— dry matter;
— nitrogen, P O (phosphorus pentoxide) and K O (potassium oxide) content extractable by
2 5 2
CaCl /DTPA;
— copper and zinc content;
— quantity.
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 soil improvers and/or 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 soil im
...