ISO 17323:2015

INTERNATIONAL ISO
STANDARD 17323
First edition
2015-06-01
Fertilizers and soil conditioners —
Sulfur Coated Urea (SCU) — General
requirements
Matières fertilisantes — Urée enrobée de soufre (SCU) — Exigences
générales
Reference number
©
ISO 2015
© ISO 2015, Published in Switzerland
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ii © ISO 2015 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 2
4.1 Appearance . 2
4.2 Requirement of sulfur coated urea . 2
5 Sampling and preparation of test sample . 2
5.1 Sampling method . 2
5.1.1 Products in bags . 2
5.1.2 Products in bulk . . . 2
5.2 Reduction of samples . 3
5.3 Test sample preparation . 3
6 Marking and labelling . 3
7 Packaging, transport, and storage . 4
Annex A (informative) Some examples for SCU . 5
Bibliography . 6
Foreword
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The committee responsible for this document is ISO/TC 134, Fertilizers and soil conditioners.
iv © ISO 2015 – All rights reserved

Introduction
Sulfur Coated Urea (SCU) is a coated slow release fertilizer consisting of urea particles coated with
sulfur, which was first developed by the Tennessee Valley Authority’s National Fertilizer Development
Center (TVA/NFDC), Alabama in 1961, and produced commercially in 1967. SCU is made by coating urea
with sulfur and sealant. The main coating material of SCU is sulfur. Sulfur is insoluble in water and its
chemical properties are stable, thus it is an impermeable coating material. In addition, sulfur itself is a
secondary nutrient and it does not pollute the soil when applied appropriately.
This International Standard specifies general requirements, sampling, and preparation of test sample,
marking and labelling, packaging, transport, and storage for SCU.
NOTE Some countries or regions might have published other standards covering requirements for SCU.
INTERNATIONAL STANDARD ISO 17323:2015(E)
Fertilizers and soil conditioners — Sulfur Coated Urea
(SCU) — General requirements
1 Scope
This International Standard specifies general requirements, sampling and preparation of test sample,
marking and labelling, packaging, transport, and storage for SCU.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 7409, Fertilizers — Marking — Presentation a
...