SIST EN 15761:2026

SLOVENSKI STANDARD
01-april-2026
Nadomešča:
SIST EN 15761:2010
Predoblikovani rastni substrati - Določanje mer in prostorninske gostote
Pre-shaped growing media - Determination of the dimensions and bulk density
Vorgeformte Kultursubstrate - Bestimmung der gemessenen Maße und der Schüttdichte
Supports de culture préformés - Détermination des dimensions mesurées et de la masse
volumique apparente
Ta slovenski standard je istoveten z: EN 15761:2026
ICS:
65.080 Gnojila Fertilizers
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 15761
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2026
EUROPÄISCHE NORM
ICS 65.080 Supersedes EN 15761:2009
English Version
Pre-shaped growing media - Determination of the
dimensions and bulk density
Supports de culture préformés - Détermination des Vorgeformte Kultursubstrate - Bestimmung der Maße
dimensions et de la masse volumique apparente und der Schüttdichte
This European Standard was approved by CEN on 14 December 2025.

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. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists 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.
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. EN 15761:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle . 6
5 Apparatus . 6
6 Sampling and sample preparation . 7
7 Procedure . 7
8 Calculations and expression of results. 8
9 Precision . 10
10 Test report . 10
Annex A (informative) Results of an inter-laboratory trial . 11
A.1 Trials. 11
A.2 Results . 12
Bibliography. 13

European foreword
This document (EN 15761:2026) has been prepared by Technical Committee CEN/TC 223 “Soil
improvers and growing media”, the secretariat of which is held by NEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by July 2026 and conflicting national standards shall be
withdrawn at the latest by July 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 15761:2009.
In comparison with the previous edition, the following technical modifications have been made:
— the text has been editorially revised, no technical changes to the described method itself have been
made;
— pre-shaped plugs have been excluded from the scope;
— updated references in Clause 2;
— the terms and definitions are aligned with CEN/TS 17732;
— a dimensional measuring instrument has been added to Clause 5 and 7.3.1;
— Clause 6 on sampling has been added;
— descriptions for other shapes, such as (truncated) conical material and cylindrical material, have
been added to the text.
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.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: 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 the United
Kingdom.
Introduction
This document has been developed so that there is a standard method to measure and weigh pre-shaped
growing media and to calculate the volume and bulk density.
The volume of growing media is a useful attribute for growers and is critical for ensuring plants have
sufficient growing media for their root system.
The bulk density is crucial as the reporting of all chemical analyses is expressed in units of mass per
volume, and the volume is determined from the mass of the sample used for the chemical analyses.
Pre-shaped growing media are generally made from mineral wool, some are manufactured using
polyurethane and others from stabilized organic material. Depending on their field of application they
are known by various names:
— pre-shaped "plugs" are small blocks used for seedlings, which are generally cylindrical in shape; once
the seed has germinated the seedling in the plug might then be placed into "blocks". Pre-shaped plugs
are excluded in the scope of this document;
— pre-shaped "blocks" might have holes to take plugs and can vary in size; they are generally used for
propagation purposes;
— pre-shaped "slabs" are used for growing vegetables and range in size.
Annex A contains results of an inter-laboratory trial organized to test the procedures specified in this
document.
1 Scope
This document specifies a method for the determination of the dimensions and of the bulk density of pre-
shaped growing media.
In this document, "pre-shaped growing media":
— includes solid, regular shaped, stable growing media sold, or which are ready for use, as a growing
medium, where the dimensions and any corners are stable;
— excludes plugs;
NOTE For the determination of the dimensions and the bulk density of plugs, EN 18250:— applies [1].
— excludes solid growing media that has to be hydrated for it to form, varies in dimension with varying
water content – for example, coir or peat slabs or growing bags.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
CEN/TS 17732, Soil improvers and growing media — Terminology
3 Terms and definitions
For the purposes of this document, the terms and definitions given in CEN/TS 17732 and the following
apply.
3.1
length
l
longer linear dimension of the major surface of the test specimen
3.2
width
w
shorter linear dimension of the major surface of the test specimen measured at right angles to the length
3.3
height
h
linear dimension measured top to bottom
3.4
depth
d
linear dimension measuring how deep recess intrude into the media

Under preparation. Stage at the time of publication: prEN 18250:2025.
3.5
diameter
D
chord that runs through the centre point of the circle
3.6
bulk density
indication of how much 1 l of the product weighs, being determined in a standardized way
Note 1 to entry: The bulk density is expressed in grams per litre (g/l) or in kilograms per cubic metre (kg/m ).
3.7
block
pre-shaped growing medium that might have holes to take plugs
Note 1 to entry: Blocks are generally used for propagation purposes.
Note 2 to entry: Blocks can vary in size.
3.8
slab
pre-shaped growing medium used for growing plants
Note 1 to entry: Slabs can vary in size.
4 Principle
The test specimen is placed on a flat surface.
For regular rectangular material, measurements for the length, width and height are taken.
For (truncated) conical material and cylindrical material, measurements for height and diameter are
taken.
The volume is calculated from these dimensions and, after the determination of the mass, the bulk density
is calculated.
5 Apparatus
5.1 Flat surface, horizontal, flat stable surface, e.g. table top, which is large enough for the test
specimen and the measuring devices.
5.2 Metal rule or metal tape, graduated in millimetres and permitting reading to 0,5 mm or less.
NOTE 1 Measures conforming to the requirements of OIML R35-1:2007, Material measures of length for general
use. Part 1: Metrological and technical requirements [2], Class II are appropriate. This can be obtained from
https://www.oiml
...