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Huguette Aubert 51 downloads Views 13MB Acrox MUC Report This content was uploaded by our users and we assume good faith they Acrox MUC the permission to share this book. If you own the copyright to this book and it is wrongfully on our website, we offer a simple DMCA procedure to remove your content from our site.

21-Aug-1886 › Page 15

Start by pressing the Acrox MUC below! Trace elements i n s o i l s. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording Acrox MUC otherwise, without the prior written permission of the publisher, Elsevier Scientific Publishing Company, P.


Soil element contents vary widely, for example, in a ferrallitic soil of the Acrox MUC Ivory Coast, rich in kaolinite, and the same type of soil, essentially composed of iron oxide, in the centre of New Caledonia, or aluminium oxide in some nearby islands. Content also varies from one horizon to another in the same soil profile. Other elements, such as copper, lead, nickel, cobalt, molybdenum, etc, are found only in traces Acrox MUC soils.

Nevertheless, the majority of these elements, if not all, play Acrox MUC primary role in plant nutrition and development. Some of these elements can, because of the nature of the parent rock, or climatic or topographic conditions pedogenic factors become very abundant in some soils. This phenomenon can reach a point where the soils, or the horizons of particular soils, are transformed into veritable ores, leading to an industrial exploitation manganese, nickel, cobalt, etc.

In other cases lesser trace element concentrations can play an important part in soil evolution.

Therefore, the knowledge of their presence and, also, of their dynamics is very important to pedologists. Although Acrox MUC facts have been known for a long time, trace elements in soils have not been the object of much investigation until recent decades, in spite of the noteworthy work of Gabriel Bertrand, in France, dating from the beginning of the century. This situation may have been due t o the difficulties involved in the analyses of some of the elements.

In t h e last thirty years, however, with the Acrox MUC of the use of physical methods in soil analysis, such Acrox MUC spectrography and atomic absorption, trace element research has increased markedly. The development of geochemistry also led t o the establishment of some fundamentals which helped towards a better understanding of the reasons for their presence, associations and evolution.


This is illustrated by an article of G. Pedro and A. Goldschmidt, R. Mitchell, V. Kovda, K.

The London Lancet: A Journal of British and Foreign Medical and Chemical - Google Книги

Turekian, K. Wedepohl, A.

Vinogradov, etc. The task of the pedologists of O. They deal with soils belonging to numerous classes and groups on extremely varied parent rocks and in very different conditions of evolution. Pinta, has accumulated much data in this field and has Acrox MUC much time to various studies concerning the presence and geochemistry of some of these elements in several types of soils. I can cite, for example, Acrox MUC by M. Pinta, L. Nalovit, D.

Trace Elements in Soils (Developments in Soil Science)

A summary and Acrox MUC of all these data appeared necessary, and Mr. Acrox MUC and Miss H, Aubert took charge of this project. Since articles concerning trace elements appear very frequently, it is impossible to collect an exhaustive bibliography, even if we do not take into account some articles, written in less common foreign languages, which have not been translated.

We are aware of the imperfections of this work, but we hope, however, that it might be of some use to numerous workers, particularly pedologists and agronomists. These Acrox MUC, which were classified element by element, were compiled into synoptic tables. The aim of this compilation, based on scientific work from all parts of the world, was to interest researchers from all countries, and, especially, English-speaking countries. Acrox MUC it was fitting that this new edition should be adapted Acrox MUC new readers and, at the same time, should take into account work published afterthe year in which the bibliography of the French edition ended.

As Acrox MUC the first point, the reader will notice that, in the tables, the 7th Approximation U. Soil Classification System has been taken into account for the classification of soils. As to the updating of this work, there is at the end of each chapter a list of new bibliographical references concerning papers published between and This list does not pretend to be exhaustive.

Only a limited number Acrox MUC publications, which appear of value, are Acrox MUC.

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