tailieunhanh - SOIL FERTILITY

Soil fertility is critical for the provision of adequate food, fiber and renewable natural resources(fuel,wood etc.). In the developing world soil fertility is linked to economic well being of many farm families. Poor soils means poor harvest leading to low returns for the over 60% of the population of developing countries relying on agriculture for of inorganic and organic fertilizers in addition to biological processes to improve the fertility of the soil requires good understanding of their practical use and management. The effect of these materials on the environment and economic returns need to be understood. There are many locally available resources that can be collected,. | SOIL FERTILITY Edited by Roland Nuhu Issaka Soil Fertility http 55414 Edited by Roland Nuhu Issaka Contributors Renato De Mello Prado Gustavo Caione Braulio Valles-De La Mora Epigmenio Castillo-Gallegos Jesús Jarillo-Rodriguez Eliazar Ocana-Zavaleta James M. Kombiok Jean Sogbedji Samuel Saaka Jeduah Buah Satoshi Nakamura Monrawee Fukuda Roland Nuhu Issaka Israel Dzomeku Satoshi Tobita Mohammed Moro Buri Eric Owusu Adjei Vincent Avornyo Joseph Awuni Witold Grzebisz Léon Etienne Parent Serge-Etienne Parent Danilo Rozane Amanda Hernandes William Natale Daniel Angelucci Amorim Henrique Antunes Souza Fujio Nagumo Sarita Leonel Luis Reis Published by InTech Janeza Trdine 9 51000 Rijeka Croatia Copyright 2012 InTech All chapters are Open Access distributed under the Creative Commons Attribution license which allows users to download copy and build upon published articles even for commercial purposes as long as the author and publisher are properly credited which ensures maximum dissemination and a wider impact of our publications. After this work has been published by InTech authors have the right to republish it in whole or part in any publication of which they are the author and to make other personal use of the work. Any republication referencing or personal use of the work must explicitly identify the original source. Notice Statements and opinions expressed in the chapters are these of the individual contributors and not necessarily those of the editors or publisher. No responsibility is accepted for the accuracy of information contained in the published chapters. The publisher assumes no responsibility for any damage or injury to persons or property arising out of the use of any materials instructions methods or ideas contained in the book. Publishing Process Manager Viktorija Zgela Technical Editor InTech DTP team Cover InTech Design team First published December 2012 Printed in Croatia A free online edition of this book is available at .