oSIST prEN 17756:2026

• Abstract:

  This document specifies references to methods for the determination of the chloride content in organic fertilizers, organo-mineral fertilizers, inorganic fertilizers, liming materials and inhibitors.; This document is applicable to fertilizing product blends where the 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: fertilizers is the highest % in the blend by mass or volume, or in the case of liquid form by dry mass. If fertilizer 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 only of inorganic products, the European Standard for inorganic fertilizers applies.; NOTE 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.

• Status: Not Published
• Public Enquiry End Date: 01-Oct-2026
• ICS: 65.080 - Fertilizers
• Technical Committee: KAT - Soil quality
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 22-Jul-2026
• Due Date: 09-Dec-2026
• Directive: Harmonized Standard2019/1009 - Regulation (EU) 2019/1009 of the European Parliament and of the Council of 5 June 2019 laying down rules on the making available on the market of EU fertilising products and amending Regulations (EC) No 1069/2009 and (EC) No 1107/2009 and repealing Regulation (EC) No 2003/2003 (Text with EEA relevance)
• Mandate: M/564 - Fertilising products in support of Regulation (EU) 2019/1009
• Mandate: M/564 Amd 1 - amending Implementing Decision C(2020) 612 as regards certain harmonised standards and standardisation deliverables, deadlines for their adoption and the duration of the validity of the standardisation request
• Mandate: M/564 Amd 2 - Commission Implementing decision amending Implementing Decision C(2020)612 as regards harmonised standards, the deadlines for the adoption of those standards and the duration of the validity of the standardisation request to the European Committee for Standardisation as regards the EU fertilising products in support of Regulation (EU) 2019/1009 of the European Parliament and of the Council
• Ref Project: prEN 17756 - Fertilizers, liming materials and inhibitors - Determination of the chloride content

• Revises: SIST-TS CEN/TS 17756:2023 - Organic fertilizers, organo-mineral fertilizers, inorganic fertilizers and liming materials - Determination of the chloride content
• Effective Date: 01-Sep-2026

Overview

oSIST prEN 17756:2026 specifies standardized references and test methods for the determination of chloride content in fertilizers, liming materials, and inhibitors. Developed by the Slovenian Institute for Standardization (SIST) and overseen by CEN/TC 260, this draft European Standard is designed to ensure accurate, reliable, and harmonized testing across different types of fertilizing products and blends. The scope covers organic, organo-mineral, and inorganic fertilizers, as well as liming materials and inhibitors commonly used in agriculture and horticulture.

This document plays a key role in supporting compliance with Regulation (EU) 2019/1009, which governs the marketing of EU fertilizing products. By providing clear and consistent methodologies for chloride determination, it supports quality assurance, safety, and regulatory conformity within the fertilizers sector.

Key Topics

• Applicability: Relevant to organic fertilizers, organo-mineral fertilizers, inorganic fertilizers, liming materials, and inhibitors. Extends to blends where fertilizers constitute the largest mass or volume component.
• Analytical Methods: References validated analytical techniques for determining chloride content. Includes potentiometric titration and ion chromatography.
• Sample Handling: Highlights the critical importance of representative sampling and sample preparation per EN 1482 standards to ensure accurate results.
• Product Blends: Outlines requirements for products made from two or more components (e.g., soil improvers, biostimulants). Specifies when this standard or other European standards must be used.
• Compliance: Establishes a presumption of conformity with key EU regulatory requirements for fertilizing products placed on the European market.
• Robustness and Validation: Recognizes that some matrix components may interact and affect results, but standard methods are validated for reliability across diverse compositions.

Applications

The practical value of oSIST prEN 17756:2026 lies in:

• Agricultural Fertilizer Producers: Ensuring their products meet chloride content specifications required by European regulations, thereby gaining legitimate access to the EU market.
• Laboratories and Quality Control: Applying precise testing methodologies for chloride content, supporting certification, labelling, and product differentiation.
• Blended Fertilizing Products: Enabling accurate assessment of products that combine fertilizers, liming materials, inhibitors, and other amendments, thus ensuring correct labeling and regulatory adherence.
• Regulatory Authorities: Providing a harmonized reference for compliance verification, market surveillance, and enforcement actions regarding fertilizing products.
• Importers and Distributors: Facilitating smoother trade of fertilizers and amendments by ensuring imported products meet European chloride standards.

Related Standards

oSIST prEN 17756:2026 is part of a broader ecosystem of standards affecting fertilizers, liming materials, and inhibitors. Key related standards include:

• EN 1482 series: Addresses general provisions for sampling and sample preparation.
  • EN 1482-1: General sampling provisions
  • EN 1482-2: General sample preparation provisions
  • EN 1482-3: Sampling of static heaps
• EN 12944 series: Defines terms relevant to fertilizers and liming materials.
• prEN 17758:2026: Specifies potentiometric titration for chloride determination in fertilizers and liming materials.
• prEN 18388:2026: Describes ion chromatography and conductivity detection for chloride determination in inhibitors.
• EN 16195: Provides a method for chlorides determination in inorganic fertilizers in the absence of organic matter.
• Regulation (EU) 2019/1009: The legislative framework governing the marketing of EU fertilizing products.

By following oSIST prEN 17756:2026 and associated standards, stakeholders in the fertilizer supply chain ensure regulatory compliance, product quality, and protect environmental as well as crop health.

Keywords: chloride content, fertilizers, liming materials, inhibitors, EU regulation, standard methods, agricultural quality, product compliance, sample preparation, fertilizer blends.

SLOVENSKI STANDARD
01-september-2026
Gnojila, sredstva za apnjenje in inhibitorji - Določanje klorida
Fertilizers, liming materials and inhibitors - Determination of the chloride content
Organische Düngemittel, organisch-mineralische Düngemittel, anorganische Düngemittel
und Kalkdünger - Bestimmung des Chloridgehaltes
Ta slovenski standard je istoveten z: prEN 17756
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
August 2026
ICS Will supersede CEN/TS 17756:2022
English Version
Fertilizers, liming materials and inhibitors - Determination
of the chloride content
Organische Düngemittel, organisch-mineralische
Düngemittel, anorganische Düngemittel und
Kalkdünger - Bestimmung des Chloridgehaltes
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 17756:2026 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 Sampling and sample preparation . 6
4.1 Sampling . 6
4.2 Sample preparation . 6
5 Determination of chloride content . 6
Annex ZA (informative) Relationship of this European Standard and the essential requirements
of Regulation (EU) 2019/1009 making available on the market of EU fertilising products
aimed to be covered . 7
Bibliography . 8

European foreword
This document (prEN 17756:2026) 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 17756:2022.
CEN/TS 17756:2022:
a) The CEN Technical Specification has been adopted as a European Standard including the addition of
Annex ZA;
b) Determination of the chloride content in inhibitors added to Clause 5;
c) Scope (Clause 1) updated;
d) Normative references (Clause 2) updated;
e) Bibliography updated.
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
Regulation (EU) 2019/1009 [1] lays down the rules on the making available on the market of EU
fertilizing products and the specific safety and quality requirements for the defined product function
categories (PFCs).
The specific safety and quality requirements in relation to the determination of chloride content in
organic fertilizers, organo-mineral fertilizers, inorganic fertilizers and liming materials are defined in this
document as well as normative references of the test methods to be used in order to measure the
compliance w
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