FprEN 17777

• Abstract:

  This document specifies references to the methods for the determination of the following specific elements in organic and organo-mineral fertilizers:; Determination of the total phosphorus content;; Determination of the total potassium content;; Determination of the total calcium content;; Determination of the total magnesium content;; Determination of the total sodium content;; Determination of the total sulphur content;; Determination of the inorganic arsenic content;; Determination of the cadmium content;; Determination of the total chromium content;; Determination of the total mercury content;; Determination of the total nickel content;; Determination of the total lead content;; Determination of the total copper content;; Determination of the total zinc content;; Determination of the water-soluble calcium content;; Determination of the water-soluble magnesium content;; Determination of the water-soluble sodium content;; Determination of the water-soluble sulphur content.; This document specifies references to the methods for the determination of the following specific elements in organo-mineral fertilizers:; Determination of the water-soluble phosphorus content;; Determination of the water-soluble potassium content;; Determination of the neutral ammonium citrate soluble phosphorus content; Determination of the formic acid soluble phosphorus content;; Determination of the total boron content;; Determination of the total cobalt content;; Determination of the total iron content; Determination of the total manganese content; Determination of the total molybdenum content;; Determination of the water-soluble boron content;; Determination of the water-soluble cobalt content;; Determination of the water-soluble copper content;; Determination of the water-soluble iron content;; Determination of the water-soluble manganese content;; Determination of the water-soluble molybdenum content;; Determination of the water-soluble zinc content.; The scope of the standards referenced in this document specifies in which cases the method is also applicable to blends.

• Status: Not Published
• Publication Date: 17-Feb-2027
• ICS: 65.080 - Fertilizers
• Technical Committee: CEN/TC 260 - Fertilizers and liming materials
• Drafting Committee: CEN/TC 260/WG 8 - Organic and organo-mineral fertilizers
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Start Date: 27-Aug-2026
• Due Date: 14-Mar-2027
• Completion Date: 27-Aug-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: oSIST prEN 17777:2026 - Organic and organo-mineral fertilizers - Determination of specific elements

• Revises: CEN/TS 17777:2022 - Organic and organo-mineral fertilizers - Determination of specific elements
• Effective Date: 11-Jun-2025

Overview

FprEN 17777, developed by CEN, specifies standardized references to test methods for the determination of specific elements in organic and organo-mineral fertilizers. As an important harmonized European Standard in the fertilizer sector, it directly supports compliance with Regulation (EU) 2019/1009 concerning the safe and effective marketing of EU fertilizing products.

This standard covers procedures to determine essential nutrients and trace elements, as well as potential contaminants, ensuring that fertilizers meet strict quality and safety requirements. The standard supports both producers and laboratories by providing clear, referenced methods for analysis.

Key Topics

FprEN 17777 outlines methods for determining a wide range of elements, which are critical for the performance and safety of organic and organo-mineral fertilizers. Key elements addressed include:

• Nutrient content:
  • Total phosphorus, potassium, calcium, magnesium, sodium, sulphur
  • Water-soluble forms of calcium, magnesium, sodium, sulphur, phosphorus, potassium
  • Neutral ammonium citrate soluble and formic acid soluble phosphorus (organo-mineral fertilizers)
• Micronutrients and trace elements:
  • Total boron, cobalt, iron, manganese, molybdenum
  • Water-soluble boron, cobalt, copper, iron, manganese, molybdenum, zinc (organo-mineral fertilizers)
• Potential contaminants:
  • Inorganic arsenic, cadmium, chromium, mercury, nickel, lead, copper, zinc

The document specifies in which cases the analytical methods are also valid for fertilizer blends, ensuring clarity in laboratory application.

Applications

The practical value of FprEN 17777 lies in its clearly defined references for testing, which deliver several key benefits:

• Regulatory compliance: Laboratories, manufacturers, and regulatory bodies across Europe use these referenced methods to ensure fertilizers comply with Regulation (EU) 2019/1009, facilitating market access and legal conformity.
• Quality assurance: Routine testing of nutrients and contaminants supports the production of reliable, high-quality fertilizers that deliver agronomic performance while protecting environmental and human health.
• Technical transparency: By providing references to harmonized analytical methods, the standard supports consistency and repeatability of results across laboratories.
• Market confidence: Adherence to recognized standards increases buyer confidence in fertilizer products, supporting transparent labeling and sustainable agricultural practices.

Related Standards

FprEN 17777 is part of a comprehensive suite of standards supporting the fertilizer sector. Key referenced and related standards include:

• prEN 12944-1 & prEN 12944-2: Vocabulary for fertilizers, liming materials, and inhibitors
• prEN 17766:2025: Extraction by water for analysis
• prEN 17767:2026 & prEN 17779:2026: Extraction of phosphorus using formic acid and neutral ammonium citrate, respectively
• prEN 17768:2026: Digestion by aqua regia for subsequent determination of elements
• prEN 17769:2026: Determination of mercury content
• prEN 17770:2026 & prEN 17774:2026: Determination of total and water-soluble elements by ICP-AES
• prEN 17775:2026: Determination of inorganic arsenic content

These standards collectively form the reference framework for consistent analysis and quality assurance in the production and control of organic and organo-mineral fertilizers.

In summary, FprEN 17777 is an essential document for anyone involved in the production, analysis, regulation, or distribution of organic and organo-mineral fertilizers in the EU, providing standardized, harmonized test methods for critical elements and supporting quality and safety across the supply chain.

SLOVENSKI STANDARD
01-marec-2026
Organska in organsko-mineralna gnojila - Določanje specifičnih elementov
Organic and organo-mineral fertilizers - Determination of specific elements
Organische und organisch-mineralische Düngemittel - Bestimmung spezifischer
Elemente
Engrais organiques et organo-minéraux - Dosage des éléments spécifiques
Ta slovenski standard je istoveten z: prEN 17777
ICS:
65.080 Gnojila Fertilizers
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
prEN 17777
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2026
ICS 65.080 Will supersede CEN/TS 17777:2022
English Version
Organic and organo-mineral fertilizers - Determination of
specific elements
Engrais organiques et organo-minéraux - Dosage des Organische und organisch-mineralische Düngemittel -
éléments spécifiques Bestimmung spezifischer Elemente
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 17777:2026 E
worldwide for CEN national Members.

prEN 17777:2026 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 8
4 Sampling and sample preparation . 8
5 Determination of specific elements . 8
5.1 Total phosphorus content. 8
5.2 Total potassium content . 8
5.3 Total calcium content . 8
5.4 Total magnesium content . 8
5.5 Total sodium content . 8
5.6 Total sulphur content . 8
5.7 Inorganic arsenic content . 8
5.8 Cadmium content . 8
5.9 Total chromium content . 9
5.10 Total mercury content . 9
5.11 Total nickel content . 9
5.12 Total lead content . 9
5.13 Total copper content . 9
5.14 Total zinc content . 9
5.15 Water-soluble calcium content . 9
5.16 Water-soluble magnesium content . 9
5.17 Water-soluble sodium content . 9
5.18 Water-soluble sulphur content . 9
5.19 Water-soluble phosphorus content . 9
5.20 Water-soluble potassium content . 9
5.21 Neutral ammonium citrate soluble phosphorus content . 9
5.22 Formic acid soluble phosphorus content . 10
5.23 Total boron content . 10
5.24 Total cobalt content . 10
5.25 Total iron content . 10
5.26 Total manganese content . 10
5.27 Total molybdenum content . 10
5.28 Water-soluble boron content . 10
5.29 Water-soluble cobalt content . 10
5.30 Water-soluble copper content . 10
5.31 Water-soluble iron content . 10
5.32 Water-soluble manganese content . 10
5.33 Water-soluble molybdenum content . 10
5.34 Water-soluble zinc content . 10
prEN 17777:2026 (E)
Annex ZA (informative) Relationship between 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 . 11
Bibliography . 18

prEN 17777:2026 (E)
European foreword
This document (prEN 17777:2026) 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 17777:2022.
Compared to the previous edition, prEN 17777:2026 includes the following significant technical changes:
— the CEN Technical Specification has been adopted as a European Standard including the addition of
Annex ZA;
— Scope (Clause 1) updated including a clarification on fertilizing product blends.
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.
prEN 17777:2026 (E)
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). Organic and organo-mineral have been classified as PFC 1 (A) and PFC 1 (B)
In order to measure the compliance with the related requirements of the Regulation (EU) 2019/1009 [1]
relevant test methods have to be defined in harmonized standards. In this document the normative
references of the test methods to be used for organic and organo-mineral fertilizers are defined in order
to measure the compliance with the related requirement in the Regulation (EU) 2019/1009 [1].

prEN 17777:2026 (E)
1 Scope
This document specifies references to the methods for the determination of the following specific
elements in organic and organo-mineral fertilizers:
— determination of the total phosphorus content;
— determination of the total potassium content;
— determination of the total calcium content;
— determination of the total magnesium content;
— determination of the total sodium content;
— determination of the total sulphur content;
— determination of the inorganic arsenic content;
— determination of the cadmium content;
— determination of the total chromium content;
— determination of the total mercury content;
— determination of the total nickel content;
— determination of the total lead content;
— determination of the total copper content;
— determination of the total zinc content;
— determination of the water-soluble calcium content;
— determination of the water-soluble magnesium content;
— determination of the water-soluble sodium content;
— determination of the water-soluble sulphur content.
This document specifies references to the methods for the determination of the following specific
elements in organo-mineral fertilizers:
— determination of the water-soluble phosphorus content;
— determination of the water-soluble potassium content;
— determination of the neutral ammonium citrate soluble phosphorus content;
— determination of the formic acid soluble phosphorus content;
— determination of the total boron content;
— determination of the total cobalt content;
prEN 17777:2026 (E)
— determination of the total iron content;
— determination of the total manganese content;
— determination of the total molybdenum content;
— determination of the water-soluble boron content;
— determination of the water-soluble cobalt content;
— determination of the water-soluble copper content;
— determination of the water-soluble iron content;
— determination of the water-soluble manganese content;
— determination of the water-soluble molybdenum content;
— determination of the water-soluble zinc content.
The scope of the standards referenced in this document specifies in which cases the method is also
applicable to fertilizing product blends.
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.
prEN 12944-1:2026, Fertilizers, liming materials and inhibitors — Vocabulary — Part 1: General terms
prEN 12944-2:2026, Fertilizers, liming materials and inhibitors — Vocabulary — Part 2: Terms relating to
fertilizers
prEN 17766:2025, Organic and organo-mineral fertilizers — Extraction by water for subsequent
determination of elements
prEN 17767:2026, Organo-mineral fertilizers — Extraction of phosphorus by formic acid
prEN 17768:2026, Organic and organo-mineral fertilizers — Digestion by aqua regia for subsequent
determination of elements
prEN 17769:2026, Organic and organo-mineral fertilizers — Determination of the mercury content
prEN 17770:2026, Organic and organo-mineral fertilizers — Determination of total content of specific
elements by ICP-AES after digestion by aqua regia
prEN 17774:2026, Organic and organo-mineral fertilizers — Determination of the content of specific
elements by ICP-AES after extraction by water and weak solvents
prEN 17775:2026, Organic and organo-mineral fertilizers — Determination of the inorganic arsenic
content
prEN 17779:2026, Organo-mineral fertilizers — Extraction of phosphorus soluble in a neutral ammonium
citrate solution
prEN 17777:2026 (E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in prEN 12944-1:2026 and
prEN 12944-2:2026 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/
4 Sampling and sample preparation
Sampling an
...