ISO INTERNATIONAL STANDARD 1673 Second edition 1991-05-01 Onions -- Guide to storage Oignons - Guide pour I'entreposage Reference number ISO 1673:1991(E) No reproduction Not for Resale ISO 1673:1991(E) Foreword isO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through iso technicalcommittees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with IsO, also take part in the work. iso collaborates closely with the International Electrotechnical Commission(lEC)on all matters of electrotechnical standardization Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Interna- tional Standard requires approval by at least 75 % of the member bodies casting a vote International Standard iso 1673 was prepared by Technical Committee ISO/TC 34, Agricultural food products. This second edition cancels and replaces the first edition (IsO 1673:1978),of whichit constitutes a technical revision Annex A of this International Standard is for information only. C ISO1991 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case Postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland Copyright internatioal Organization for Standardizatin Not for Resale d without licensefrom IHS ISO 1673:1991(E) INTERNATIONAL STANDARD Onions --- Guide to storage differentiated outer scales signifying that they are in Scope 1 a state of physiological rest. This International Standard gives recommendations The onions should be harvested in such a way that for the storage, with or without the use of artificial they are neither bruised or otherwise damaged. refrigeration, of onions of the species Allium cepa Linnaeus, intended for long-term conservation and The stem should be cut so that it does not exceed consumption in the fresh state. 4 cm after drying (see 3.4). Information on the limits of application of this Inter- 3.3Quality characteristics national Standard are given annex A. Qualitative inspection of onions for conservation is 2 Normative reference strongly recommended. It is necessary to choose onion bulbs of good qual- The following standard contains provisions which, ity, meeting the following requirements: sound, free through reference in this text, constitute provisions from mechanical injuries, well covered by outer of this International Standard. At the time of publi- scales, well dried, ripe and homogeneous. cation, the edition indicated was valid. All standards are subject to revision, and parties to agreements The onions should be free from foreign odour. based on this International Standard are encour- aged to investigate the possibility of applying the Bulbs having floral stems, or which are not covered most recent edition of the standard indicated below. by outer scales, which are double, triple, too large, Members of IEC and ISO maintain registers of cur- too small, deformed, or not fully mature, should not rently valid International Standards. be stored. Iso 2169:1981, Fruits and vegetables -- Physical 3.4 Various treatments before storage conditions in cold stores --- Definitions and measure- ment. To avoid sprouting. approved phytosanitary inhibi- tors may be applied if their use is not restricted. 3 Conditions of harvesting and putting Before storage, the onions should be dried to elimi into store nate excess external moisture and moisture in the outer scales,the rootlets and the neck. 3.1 Cultivars If natural drying is not