oSIST prEN 12944-1:2026
(Main)Fertilizers, liming materials and inhibitors - Vocabulary - Part 1: General terms
- Abstract
This document defines the general terms used in the production, sampling and marketing of fertilizers, liming materials and inhibitors.
- Status
- Not Published
- Public Enquiry End Date
- 01-Apr-2026
- Technical Committee
- KAT - Soil quality
- Current Stage
- 4020 - Public enquire (PE) (Adopted Project)
- Start Date
- 27-Jan-2026
- Due Date
- 16-Jun-2026
- Completion Date
- 29-Apr-2026
oSIST prEN 12944-1:2026 is the Slovenian edition of the draft European Standard prEN 12944-1 from CEN. It gives the general vocabulary for fertilizers, liming materials and inhibitors, for people who produce, sample, market, label or test these products. Because it is a vocabulary standard, its main job is to align meanings, not to set product performance limits.
What does oSIST prEN 12944-1:2026 specify?
oSIST prEN 12944-1:2026 specifies the general terms used in the production, sampling and marketing of fertilizers, liming materials and inhibitors. It organizes that vocabulary in Clause 3, with an informative index in Annex A to help users find terms quickly.
The document is arranged as follows:
- Clause 1 Scope
- Clause 2 Normative references
- Clause 3 Terms and definitions, split into topic groups from general terms to sampling and delivery
- Annex A, informative index
- Bibliography
Annex A, Table A.1 lists all defined terms in English, French and German, which matters in multilingual work because it helps match labels, technical files and contracts across languages.
What are the key requirements of oSIST prEN 12944-1:2026?
The central purpose of oSIST prEN 12944-1:2026 is to give one shared vocabulary for fertilizer-related work. In practice, that means the document helps companies, laboratories and buyers use the same words for the same product, sample or process.
Core commercial and product terms
Clause 3.1 defines the basic words used to describe products and their declared characteristics, including fertilizer, fertilizing product, fertilizer unit, nutrient formula, declarable content, declaration, guarantee and liming material. These terms matter because they are the words that appear on labels, specifications and contracts, so they need to mean the same thing to every party.
The definitions distinguish between a product’s nutrient content, the way that content is expressed, and the statement made to customers or authorities. In practice, that helps reduce disputes about whether a declaration refers to a content value, a composition guarantee or a product class.
Terms for fertilization and nutrient behavior
Clause 3.2 covers fertilization, application, application rate, availability, soil fertility, solubility of a fertilizer nutrient and mineralization. These terms are important when deciding how a product is used in the field and how its nutrients become available to plants or mushrooms.
For a user, the practical point is that the standard separates the act of applying a product from the behavior of the nutrient after application. That supports clearer agronomic advice, product comparison and field documentation.
Product types and formulation language
Clause 3.3 classifies the main types of fertilizers, including inorganic fertilizer, inorganic macronutrient fertilizer, organic fertilizer, organo-mineral fertilizer, mineral fertilizer, straight fertilizer, compound fertilizer, complex fertilizer, chelated fertilizer, blended fertilizer, foliar fertilizer, slow-release fertilizer, controlled-release fertilizer and nitrophosphate fertilizer. It also defines related terms such as chelating agent, complexing agent, fertilizing product blend and intermediate product.
This matters in practice because buyers and manufacturers need to know whether a product is organic, mineral, blended, complexed, coated or controlled-release. Those distinctions affect product selection, labeling, handling, and how the product is described in technical data sheets and procurement documents.
Nutrient categories
Clause 3.4 defines plant nutrient, primary nutrient, secondary nutrient, macronutrient, micronutrient and non-nutrient element. These definitions are used to decide which elements count as nutrients and how they are grouped.
That is important for analysis and declaration work. If a laboratory result or label uses the wrong nutrient category, the product may be described incorrectly even if the measured content is right.
Additives and inhibitors
Clause 3.5 defines additive, filler and inhibitor, and then separates urease inhibitor, nitrification inhibitor and denitrification inhibitor. These terms matter for products that are designed to change how nutrients are released or lost.
In practice, this helps users specify whether a product includes a substance added for handling or formulation, or an inhibitor added to affect nitrogen transformation in soil or in the product.
Physical form and size terms
Clause 3.6 defines solid form, liquid form, physical unit, granular fertilizer, granulation, prilled fertilizer, pelletized fertilizer, liquid fertilizer, solution fertilizer, suspension fertilizer, powdered fertilizer, coated fertilizer, particle size and particle size analysis by sieving. These terms are used to describe how the product looks, behaves and is measured.
That matters because physical form affects packaging, storage, sampling and application equipment. It also affects how a product is checked for size distribution, uniformity and representativeness during quality control.
Sampling, storage and delivery terminology
Clause 3.7 defines batch, sampling point, sampling unit, sub-sample, division, reduction, segment, segment sample, incremental sample, combined sample, reduced sample, final sample, sampled portion, laboratory sample, test sample, test portion, static heap, bulk, bulk material, bulk blend, packaging, package, big bag, consignment and delivery. This is the part users rely on when taking representative samples and tracing a product through the supply chain.
For a buyer or laboratory, the practical value is traceability. The standard gives a common vocabulary for deciding what was sampled, how the sample was built, and what part of it was actually tested.
What terms does oSIST prEN 12944-1:2026 define?
- fertilizing product - a substance, mixture, micro-organism or other material applied to plants, their rhizosphere, mushrooms or their mycosphere to provide nutrients or improve nutrient efficiency.
- liming material - a mineral substance or mixture used mainly to correct soil acidity and improve soil properties through calcium and/or magnesium compounds.
- nutrient formula - the nutrient content of a compound fertilizer expressed as percentage mass fractions in a defined order.
- primary nutrient - nitrogen, phosphorus and potassium.
- secondary nutrient - calcium, magnesium, sulphur and sodium.
- controlled-release fertilizer - a fertilizer whose nutrient release is controlled to meet a stated release rate and release time at a specified temperature.
- batch - the total quantity of product assumed to have the same characteristics for sampling purposes.
- sampling unit - a defined quantity of product with a physical or hypothetical boundary from which samples are taken.
Who uses oSIST prEN 12944-1:2026?
oSIST prEN 12944-1:2026 is used by manufacturers, formulators, laboratories, sampling teams, quality managers, regulators, traders and buyers working with fertilizers, liming materials and inhibitors. They use it to describe products correctly, prepare labels and technical documents, agree sampling plans, and interpret laboratory results in the same way.
It is also relevant for organizations that handle chemical, physical or microbiological testing of these products. The sampling chain in Clause 3.7 is especially useful for anyone who needs to prove that a test sample represents a batch or a consignment.
What changed in oSIST prEN 12944-1:2026 from the previous edition?
The foreword says this draft will supersede EN 12994-1:1999 and EN 12944-1:1999/AC:2000. Compared with the previous edition, the stated technical changes are:
- the scope is extended to include inhibitors
- definitions are reviewed, amended and extended in light of new legislation and other European and international standards
- many new terms are added, including fertilizing product, nutrient formula, liming material, inorganic macronutrient fertilizer, chelating agent, complexing agent, fertilizing product blend, controlled-release fertilizer, macronutrient, urease inhibitor, nitrification inhibitor and the sampling and delivery terminology in Clause 3.7
- the term soil improver is deleted
Which standards are used with oSIST prEN 12944-1:2026?
The document points users to several related standards and companion texts that support its terminology:
- EN 13535 - classification scheme for fertilizers and liming materials
- ISO 8157:2022 - source vocabulary for several general, nutrient, additive, physical and sampling terms
- EN 12944-3:2025 - terms relating to liming materials
- EN 17836:2024 - description of forms of the physical unit, including granular, prilled, pelletized and powdered forms
- EN 1482-1:2024 - general sampling provisions and sample preparation
- EN 1482-3:2024 - sampling of static heaps
- EN 1482-4:2024 - sampling for microbial presence
- CEN/TS 17732:2022 - terminology for soil improvers and growing media
- EN 17724 - terminology for plant biostimulants
What does the oSIST prEN 12944-1:2026 document contain?
The document is a terminology standard, so its main content is a structured list of definitions with source notes and occasional notes to entry. Clause 3 groups the terms into general terms, fertilization, types of fertilizers, nutrients, additions, physical properties, and sampling, storing and delivery.
Annex A provides a trilingual index table of all defined terms in English, French and German. The bibliography points to the regulations and related standards behind many of the definitions, which helps users trace how the vocabulary fits into wider fertilizer and sampling practice.
Relations
- Effective Date
- 01-Mar-2026
- Effective Date
- 01-Mar-2026
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Frequently Asked Questions
oSIST prEN 12944-1:2026 is a draft published by the Slovenian Institute for Standardization (SIST). Its full title is "Fertilizers, liming materials and inhibitors - Vocabulary - Part 1: General terms". This standard covers: This document defines the general terms used in the production, sampling and marketing of fertilizers, liming materials and inhibitors.
This document defines the general terms used in the production, sampling and marketing of fertilizers, liming materials and inhibitors.
oSIST prEN 12944-1:2026 is classified under the following ICS (International Classification for Standards) categories: 01.040.65 - Agriculture (Vocabularies); 65.080 - Fertilizers. The ICS classification helps identify the subject area and facilitates finding related standards.
oSIST prEN 12944-1:2026 has the following relationships with other standards: It is inter standard links to SIST EN 12944-1:2002/AC:2002, SIST EN 12944-1:2002. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
oSIST prEN 12944-1:2026 is associated with the following European legislation: EU Directives/Regulations: 2019/1009. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
oSIST prEN 12944-1:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2026
Gnojila, sredstva za apnjenje in inhibitorji - Slovar - 1. del: Splošni izrazi
Fertilizers, liming materials and inhibitors - Vocabulary - Part 1: General terms
Düngemittel und Calcium-/Magnesium-Bodenverbesserungsmittel - Wörterbuch - Teil 1:
Allgemeine Begriffe
Engrais et amendements calciques et/ou magnésiens - Vocabulaire - Partie 1: Termes
généraux
Ta slovenski standard je istoveten z: prEN 12944-1
ICS:
01.040.65 Kmetijstvo (Slovarji) Agriculture (Vocabularies)
65.080 Gnojila Fertilizers
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
EUROPEAN STANDARD
prEN 12944-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2026
ICS 01.040.65 Will supersede EN 12944-1:1999
English Version
Fertilizers, liming materials and inhibitors - Vocabulary -
Part 1: General terms
Engrais, amendements minéraux basiques et Düngemittel, Kalkdünger und Hemmstoffe - Begriffe -
inhibiteurs - Vocabulaire - Partie 1: Termes généraux Teil 1: Allgemeine Begriffe
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 12944-1:2026 E
worldwide for CEN national Members.
prEN 12944-1 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
3.1 General terms . 5
3.2 Terms related to fertilization . 6
3.3 Types of fertilizers . 7
3.4 Terms related to nutrients . 10
3.5 Additions to fertilizers . 10
3.6 Physical properties of fertilizers . 11
3.7 Sampling, storing and delivery of fertilizers . 13
Annex A (informative) Index . 17
Bibliography . 20
prEN 12944-1 (E)
European foreword
This document (prEN 12944-1:2026) 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 EN 12994-1:1999 and EN 12944-1:1999/AC:2000.
In comparison with the previous edition, the following technical mödificatiöns have been made:
— Scope extended to include inhibitors;
— Définitiöns reviewed, amended and extended where appropriate in light of new legislation,
international and other European standards;
— Inclusion of the following terms: fertilizing product, nutrient formula, liming material, inorganic
macronutrient fertilizer, chelating agent, complexing agent, fertilizing product blend, controlled-
release fertilizer, macronutrient, urease inhibitor, nitrificatiön inhibitor, solid form, liquid form,
physical unit, powdered fertilizer, particle size analysis by sieving/granulometry by sieving, batch,
sampling point, sampling unit, sub-sample, division, reduction, segment, segment sample,
incremental sample, combined sample, reduced sample, final sample, sampled portion, laboratory
sample, test sample, test portion, static heap, bulk material, packaging, package, consignment,
delivery;
— The term soil improver was deleted.
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.
EN 12944, Fertilizers, liming materials and inhibitors — Vocabulary, currently consists of the
following parts:
— Part 1: General terms.
— Part 2: Terms relating to fertilizers.
— Part 3: Terms relating to liming materials.
These définitiöns do not necessarily correspond with those used in national legislation.
NOTE A classificatiön scheme for fertilizers and liming materials is given in EN 13535 [1] .
prEN 12944-1 (E)
Introduction
Fertilizers, liming materials and inhibitors are définéd in Regulation (EU) 2019/1009 [2].
Other vocabulary standards relating to soil improvers and growing media (CEN/TS 17732 [3]) and plant
biostimulants (EN 17724 [4]) are available.
An index of all terms définéd in this part of the EN 12944 series is given in Annex A, Table A.1 in English,
French and German.
prEN 12944-1 (E)
1 Scope
This document définés the general terms used in the production, sampling and marketing of fertilizers,
liming materials and inhibitors.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and définitiöns apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1 General terms
3.1.1
fertilizer
product the main function of which is to provide nutrients to plants or mushrooms
Note 1 to entry: Based on Regulation (EU) 2019/1009, Annex I, Part II, PFC 1 [2].
3.1.2
fertilizing product
substance, mixture, micro-organism or any other material, applied or intended to be applied on plants
or their rhizosphere or on mushrooms or their mycosphere, or intended to constitute the rhizosphere
or mycosphere, either on its own or mixed with other material, for the purpose of providing the plants
or mushrooms with nutrient or improving their nutrition éfficiéncy
Note 1 to entry: Based on Regulation (EU) 2019/1009, Chapter 1, Article 2, point (1) [2].
3.1.3
fertilizer unit
unit mass of a fertilizer nutrient expressed in the form of the element or an oxide
Note 1 to entry: The unit is generally the kilogram.
3.1.4
nutrient formula
mass fraction expressed as a percentage as element or oxide, in the order nitrogen: phosphorus:
potassium: secondary nutrients and micro-nutrients, of the respective content of these nutrients in a
compound fertilizer
Note 1 to entry: A zero may be used to indicate the absence of an element.
[SOURCE: ISO 8157:2022 [5], 3.1.37 - mödifiéd: "primary" from "primary nutrient formula" removed
and définitiön replaced with Note 1]
3.1.5
declarable content
that content of an element (or an oxide) which can be declared on a label or document associated with
a fertilizing product
[SOURCE: ISO 8157:2022 [5], 3.1.38 – mödifiéd: given changed to declared]
prEN 12944-1 (E)
3.1.6
declaration
statement of the nutrient content or other information
[SOURCE: ISO 8157:2022 [5], 3.1.39]
3.1.7
nutrient ratio
ratio by mass of the primary nutrients in the fertilizer, expressed in the form of the element or an oxide,
in the order of nitrogen, phosphorus and potassium
Note 1 to entry: The ratio can be based on nitrogen as unity or on the nutrient with the lowest proportion.
[SOURCE: ISO 8157:2022 [5], 3.1.43]
3.1.8
guarantee
guarantee of composition
quantitative and/or qualitative characteristics with which a marketed product complies to satisfy
contractual and/or legal requirements
3.1.9
liming material
agricultural lime
mineral substances and mixtures whose main function is to correct soil acidity improving physical,
chemical and biological soil properties and which contains either oxides, hydroxides, carbonates, or
silicates of the nutrients calcium and/or magnesium
Note 1 to entry: The terms “lime” and “liming soil amendment” are also used, but “liming material” is the preferred
term.
[SOURCE: EN 12944-3:2025 [6], 3.1.20]
3.2 Terms related to fertilization
3.2.1
fertilization
aspects of the use of fertilizing products to improve crop growth and soil fertility and structure
[SOURCE: ISO 8157:2022 [5], 3.1.29 – mödifiéd: Note 1 to entry removed]
3.2.2
application
general term for all processes of administering fertilizers, liming materials and inhibitors to a crop or
soil or both
Note 1 to entry: This term embraces broadcasting, spreading/spraying or dusting, as well as more spécific
placement methods including injection into the soil and the combined drilling of seed and fertilizer. It may be
broadened to cover nutrient film techniques (foliar application) and the addition of fertilizers to irrigation water
(fertigation).
3.2.3
application rate
dose rate
mass or volume of a fertilizer, liming material, inhibitor or nutrient applied to a unit area or the unit
mass or unit volume of growth medium
prEN 12944-1 (E)
3.2.4
availability
extent to which fertilizer nutrients can be taken up by plants and mushrooms
[SOURCE: ISO 8157:2022 [5], 3.1.61 – mödifiéd: mushrooms added]
3.2.5
soil fertility
ability of a soil to support and ensure plant growth
[SOURCE: ISO 8157:2022 [5], 3.1.28]
3.2.6
solubility of a fertilizer nutrient
mass or volume of a given nutrient which is extracted by a spécific medium under spécifiéd conditions
Note 1 to entry: Expressed as a percentage by mass or volume of the fertilizer.
[SOURCE: ISO 8157:2022 [5], 3.1.33]
3.2.7
mineralization
microbial breakdown releasing nutrients from organic matter, making them available to plants and
mushrooms for uptake
3.3 Types of fertilizers
3.3.1
inorganic fertilizer
fertilizer containing or releasing nutrients in a mineral form, other than an organic or organo-mineral
fertilizer
Note 1 to entry: The terms “mineral fertilizer” and “chemical fertilizer” are also used but “inorganic fertilizer” is
preferred.
Note 2 to entry: An inorganic fertilizer can be labelled as mineral fertilizer if the inorganic fertilizer complies with
Regulation (EU) 2019/1009, Annex III, Part II, PFC 1, point 4 [2].
Note 3 to entry: Based on Regulation (EU) 2019/1009, Annex I, Part II, PFC 1(C), point 1 [2].
3.3.2
inorganic macronutrient fertilizer
fertilizer aiming at providing plants or mushrooms with one or more primary macronutrients and/or
secondary macronutrients
Note 1 to entry: Primary macronutrients: nitrogen (N), phosphorus (P), potassium (K); secondary macronutrients:
calcium (Ca), magnesium (Mg), sodium (Na), sulphur (S).
Note 2 to entry: Based on Regulation (EU) 2019/1009, Annex I, Part II, PFC 1(C)(I) point 1 [2]
[SOURCE: EN 17836:2024 [7], 3.5]
prEN 12944-1 (E)
3.3.3
organic fertilizer
fertilizer containing organic carbon and nutrients of solely biological origin
Note 1 to entry: An organic fertilizer may contain peat, leonardite and lignite, but no other material, which is
fossilized or embedded in geological formations.
Note 2 to entry: Based on Regulation (EU) 2019/1009, Annex I, Part II, PFC 1(A), point 1 [2].
3.3.3.1
organic nitrogenous fertilizer
organic fertilizer of biological origin in which the declarable nitrogen content is bonded directly to
carbon and which can contain other elements, but which does not have a declarable phosphorus or
potassium content
[SOURCE: ISO 8157:2022 [5], 3.1.7 – mödifiéd: materials changed to organic fertilizer]
3.3.3.2
synthetic organic nitrogenous fertilizer
nitrogenous fertilizer in which the nitrogen is combined with carbon by industrial organic synthesis
3.3.4
organo-mineral fertilizer
fertilizer, which is a co-formulation of one or more inorganic fertilizer (3.3.1), and one or more materials
containing organic carbon and nutrients of solely biological origin
Note 1 to entry: An organo-mineral fertilizer may contain peat, leonardite and lignite, but no other material, which
is fossilized or embedded in geological formations.
Note 2 to entry: Based on Regulation (EU) 2019/1009, Annex I, Part II, PFC 1(B), point 1 [2].
3.3.5
mineral fertilizer
inorganic fertilizer containing not more than 1 % by mass of organic carbon
Note 1 to entry: This définitiön does not depict all legal requirements and is based on Regulation (EU) 2019/1009,
Annex III, Part II, PFC 1, point 4 [2].
3.3.6
straight fertilizer
macronutrient fertilizer having a declared content of more than one primary macronutrient or more
than one secondary macronutrient and no primary macronutrient or an inorganic micronutrient
fertilizer having a declared content of more than one micronutrient
Note 1 to entry: Based on Regulation (EU) 2019/1009, Annex I, Part II: PFC 1(C)(I)(a)(ii), point 1; PFC (C)(I)(b)
(ii), point 1 and PFC 1(C)(II)(b), point 1 [2].
3.3.7
compound fertilizer
macronutrient fertilizer having a declared content of more than one primary macronutrient or more
than one secondary macronutrient and no primary macronutrient or an inorganic micronutrient
fertilizer having a declared content of more than one micronutrient
Note 1 to entry: Based on Regulation (EU) 2019/1009, Annex I, Part II: PFC 1(C)(I)(a)(ii), point 1; PFC (C)(I)(b)
(ii), point 1 and PFC 1(C)(II)(b), point 1 [2].
3.3.8
complex fertilizer
solid inorganic macronutrient fertilizer in which each physical unit contains all the declared nutrients
in their declared content
Note 1 to entry: Based on Regulation (EU) 2019/1009, Annex III, Part II, PFC 1(C)(I)(a)(ii), point 1 [2].
prEN 12944-1 (E)
3.3.9
chelated fertilizer
fertilizer in which one or more nutrients are bonded by chelating agents
[SOURCE: ISO 8157:2022 [5], 3.1.27]
3.3.10
chelating agent
organic molecule having two or more sites that donate electron pairs to a central metal cation and is
large enough to form a fivé- or six-membered ring structure
EXAMPLE EDTA, NTA (nitrile-triacetic acid) and IDHA (iminodiscuccinic acid)
[SOURCE: ISO 8157:2022 [5], 3.1.27.3]
3.3.11
complexing agent
organic substance forming a flat or steric structure with one di- or tri-valent transition metal cation
Note 1 to entry: Based on Regulation (EU) 2019/1009, Annex II, Part II, CMC 1, point 3(b) [2].
3.3.12
fertilizing product blend
mix of at least two of the fertilizing products: fertilizer, liming material, soil improver, growing media,
inhibitor and plant biostimulant
Note 1 to entry: Based
...