oSIST prEN 17773:2026

SLOVENSKI STANDARD
01-marec-2026
Organska in organsko-mineralna gnojila - Določanje suhe snovi
Organic and organo-mineral fertilizers - Determination of the dry matter content
Organische und organisch-mineralische Düngemittel - Bestimmung des
Trockenmassegehalts
Engrais organiques et organo-minéraux - Détermination de la teneur en matière sèche
Ta slovenski standard je istoveten z: prEN 17773
ICS:
65.080 Gnojila Fertilizers
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
prEN 17773
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2026
ICS 65.080 Will supersede CEN/TS 17773:2022
English Version
Organic and organo-mineral fertilizers - Determination of
the dry matter content
Engrais organiques et organo-minéraux - Organische und organisch-mineralische Düngemittel -
Détermination de la teneur en matière sèche Bestimmung des Trockenmassegehalts
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 260.
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 17773:2026 E
worldwide for CEN national Members.

prEN 17773:2026 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle . 6
5 Sampling and sample preparation . 6
6 Interferences . 6
7 Reagents . 6
8 Apparatus . 6
9 Procedure . 6
9.1 General. 6
9.2 Procedure A . 6
9.3 Procedure B . 7
9.4 Procedure A and B . 7
10 Quality control . 8
11 Calculation and expression of results . 8
12 Precision . 8
12.1 Inter-laboratory study . 8
12.2 Repeatability . 8
12.3 Reproducibility . 8
13 Test report . 9
Annex A (informative) Results of the inter-laboratory study . 10
Bibliography . 13

prEN 17773:2026 (E)
European foreword
This document (prEN 17773:2026) has been prepared by Technical Committee CEN/TC 260 “Fertilizers
and liming materials”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede CEN/TS 17773:2022.
prEN 17773:2026 includes the following significant technical changes with respect to
CEN/TS 17773:2022:
— The CEN Technical Specification has been adopted as a European Standard;
— Scope (Clause 1) updated including the clarification on fertilizing product blends;
— Normative references to sampling added;
— Terms and definitions revised and updated;
— Precision (Clause 12) added;
— Test report (Clause 13) revised;
— Bibliography revised;
— Annex A (Results of the inter-laboratory study) 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.
prEN 17773:2026 (E)
Introduction
NOTE 1 Regulation (EU) 2019/1009 [1] specifies safety and quality requirements for component materials and
component material categories (CMCs) of fertilizing products available on the EU market.
NOTE 2 By-products within the meaning of Directive 2008/98/EC have been classified as CMC 11, thermal
oxidation materials or derivatives as CMC 13 and recovered high purity materials as CMC 15 in Regulation (EU)
2019/1009 [1].
The other standards for determination of dry matter in solid fertilizers and liming materials [2, 3], in soil
improvers and growing media [4] and sludge, soil and other solid matrices [5, 6] were studied as a basis
of the described method. The sand pan technique suitable for liquid fertilizers where there is a risk of a
cake surface formation or foam formation was based on the method of food analysis [7].
WARNING — Persons using this document should be familiar with usual laboratory practice. This
document does not purport to address all of the safety issues, if any, associated with its use. It is the
responsibility of the user to establish appropriate health and safety practices and to ensure compliance
with any national regulatory conditions.
IMPORTANT — It is absolutely essential that tests conducted according to this document are carried out
by suitably trained staff.
prEN 17773:2026 (E)
1 Scope
This document specifies the procedure for the determination and calculation of the dry matter content of
organic and organo-mineral fertilizers for which the results of the performed analysis are to be calculated
to the dry matter content basis.
This document is applicable and validated for several types of matrices as indicated in Annex A.
This document is applicable to the component materials “by-products”, “thermal oxidation materials and
derivatives”, or “recovered high-purity materials”, when used as components of fertilizing products, as
well as the fertilizing products blends where a blend is a mix of at least two of the following components:
fertilizers, liming materials, soil improvers, growing media, inhibitors, plant biostimulants and where the
following category organic fertilizers, organo-mineral fertilizers is the highest % in the blend by mass or
volume, or in the case of liquid form by dry mass. If the organic fertilizer or the organo-mineral fertilizers
is not the highest % in the blend, the European Standard for the highest % of the blend applies. In case a
fertilizing product blend is composed of components in equal quantity, the user decides which standard
to apply. Variations in analytical methods for fertilizing product blends can lead to differing results as
some components or matrix interactions can affect the outcome. Validation procedures have shown that
developed standard methods are robust and reliable across diverse product compositions, but possible
interferences and unexpected results when analysing fertilizing product blends are possible.
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.
EN 12944-1, Fertilizers and liming materials — Vocabulary — Part 1: General terms
EN 12944-2, Fertilizers and liming materials — Vocabulary — Part 2: Terms relating to fertilizers
EN 1482-2, Fertilizers, liming materials and inhibitors — Sampling and sample preparation — Part 2:
General sample preparation provisions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 12944-1 and EN 12944-2 and
the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1
dry residue
remaining mass fraction of a sample after a drying process under specified conditions
3.2
dry matter content
mass fraction of a sample calculated by the determination of dry residue
prEN 17773:2026 (E)
4 Principle
The samples are dried to a constant mass in an oven at (105 ± 2) °C. The difference in mass before and
after the drying process is used to determine dry matter content. This method applies to solid samples
and samples which become solid during the drying process. Volatile compounds volatilizing at
temperatures up to and including (105 ± 2) °C are expressed as water using this procedure.
5 Sampling and sample preparation
Sampling is not part of the method specified in this document. Recommended sampling methods are
given in EN 1482-1 [10] and in EN 1482-3 [11].
It is important that the laboratory receives a sample that is representative of both the product under
consideration and the given analysis. The sample should not have been damaged or changed during
transport or storage.
Sample preparation shall be carried out in accordance with EN 1482-2.
6 Interferences
The samples can change during the drying process, e.g. by absorption of carbon dioxide in the case of
alkaline samples, or of oxygen by reducing substances.
7 Reagents
7.1 Sand, CAS 14808-60-7.
NOTE Other heat stable inert materials, e.g. pumice stone, diatomaceous earth, etc. are also suitable.
8 Apparatus
8.1 Drying system, thermostatically controlled and capable of maintaining temperature of
(105 ± 2) °C.
8.2 Desiccator, with an active drying agent such as silica gel.
8.3 Analytical balance, capable of weighing to the nearest 1 mg or better.
8.4 Evaporating dish or crucible
...