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<em>Nitrogen Economy in Tropical Soils presents an authoritative and comprehensive state-of-the-art review on soil/plant nitrogen inter-relationships, with special reference to tropical soils and crops in aerobic and anaerobic environments. Use of isotopically labelled nitrogen in experimentation, especially in tropical environments, and recently developed analytical techniques for soil and plant materials are presented. An important aspect is the emphasis placed on the impact of the tropical environment on nitrogen transformations in the soil environment. This book should be an excellent source of information for senior undergraduate and graduate students with interest in soil/plant nitrogen inter-relationships, and for all levels of research workers in these fields.
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NITROGEN ECONOMY IN TROPICAL SOILS Developments in Plant and Soil Sciences VOLUME 69 The titles published in this series are listed at the end of this volume. Nitrogen Economy in Tropical Soils Proceedings of the International Symposium on Nitrogen Economy in Tropical Soils, held in Trinidad, W.I., January 9-14, 1994 Edited by N.AHMAD The University of the West Indies St. Augustine Trinidad W.I. Partly reprinted from Fertilizer Research, Volume 42, Nos. 1-3 (1995) KLUWER ACADEMIC PUBLISHERS DORDRECHT / BOSTON / LONDON A C.I.P. Catalogue record for this book is available from the Library of Congress. ISBN -13: 978-94-010-7264-9 e-ISBN-13: 978-94-009-1706-4 DOl: 10.1007/978-94-009-1706-4 Published by Kluwer Academic Publishers, P.O. Box 17,3300 AA Dordrecht, The Netherlands. Kluwer Academic Publishers incorporates the publishing programmes of D. Reidel, Martinus Nijhoff, Dr W. Junk and MTP Press. Sold and distributed in the U.S.A. and Canada by Kluwer Academic Publishers, 101 Philip Drive, Norwell, MA 02061, U.S.A. In all other countries, sold and distributed by Kluwer Academic Publishers Group, P.O. Box 322, 3300 AH Dordrecht, The Netherlands. Printed on acid-free paper All Rights Reserved © 1996 Kluwer Academic Publishers Softcover reprint of the hardcover 1st edition 1996 No part of the material protected by this copyright notice may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording or by any information storage and retrieval system, without written permission from the copyright owner. Contents Preface ix *1. Forms and nature of organic N in soil K.R. Kelley, FJ. Stevenson *2. Seasonal fluctuations of native available N and soil management implications M.T.F. Wong, S. Nortcliff 13 Effect of cultivation on the nitrogen fertility of selected agro-ecosystems in South Africa C.C. du Preez, M.E. du Toit 27 Assessment of biological nitrogen fixation S.K.A. Danso 33 High productivity analysis of 15N and 13C in soil/plant research A. Barrie, S.T. Brookes, SJ. Prosser, S. Debney 43 Adapting the potentially mineralizable N concept for the prediction of fertilizer N requirements C.A. Campbell, Y.W. Jame, 0.0. Akinrerni, M.L. Cabrera 61 Field application of the 15N isotope dilution technique for the reliable quantification of plant-associated biological nitrogen fixation R.M. Boddey, O.C. de Oliveira, BJ.R. Alves, S. Urquiaga 77 *8. Rational nitrogen fertilization in intensive cropping systems C.W. Rice, J.L. Havlin, J.S. Schepers 89 *9. Nitrogen assimilation by legumes - processes and ecological limitations S.Schubert 99 *3. *4. *5. *6. *7. *10. *11. *12. Fate of CO(NH2h-15N applied to taro (Colocasi