STD.1S014240-2-ENGL19974851903 0701410167 INTERNATIONAL ISO STANDARD 14240-2 First edition 1997-01-15 Soil quality -- Determination of soil microbial biomass - Part 2: Fumigation-extraction method Qualitedusol-Déterminationdelabiomassemicrobiennedusol--- Partie 2: Methode d'extraction parfumigation This material is reproduced from Iso documents under International Organization for Standardization (IsO) Copyright License number IHS/IcC/1996. Not for resale. No part of these ISo documents may be reproduced in any form, electronic retrieval system or otherwise, except as allowed in the copyright law of the country of use, or with the prior written consent of Iso (Case postale 56, 1211 Geneva 20, Switzerland, Fax +41 22 734 10 79), IHs or the Iso Licensor's members. so Reference number ISO14240-2:1997(E) STD.15014240-2-ENGL1997485190307014110T3 ISO 14240-2:1997(E) @ ISO 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 technical committees. Each member body interested in a subject for which a technical committee has been established has liaison with IsO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) 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 International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 14240-2 was prepared by Technical Committee ISO/TC 190, Soil quality, Subcommittee SC 4, Biological methods. Iso 14240 consists of the following parts, under the general title Soil quality - Determination of soil microbial biomass: Part 1: Substrate-induced respiration method Part2:Fumigation-extractionmethod @1S01997 All rights reserved.Unless otherwise specified, nopartof thispublication maybe reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. InternationalOrganizationforStandardization Casepostale56.CH-1211Geneve20.Switzerland Internet [email protected] X.400 C=ch; a=400net; p=iso; 0=isocs; s=central Printed in Switzerland ii Copyright International Organization for Standardizatior STD.IS0 1424D-2-ENGL 1997 4851903 0701412T3T @ ISO ISO 14240-2:1997(E) Introduction Soil consists of both living and nonliving components which exist in a complex and heterogeneous environment. Soil microflora is responsible for the degradation of organic matter, stability of aggregates and most nutrient cycling which occurs in soils. The purpose of determining the microbial biomass of soils is to allow assessment of the continued maintenance of soil fertility, the potential ability to degrade added organic materials, and the effects of addedmaterialsonthenaturalmicrobialpopulation. ii Copyright International Organization for Standardization ttedwithoutlicensefrom IHS Not for Resale