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Organic matter dynamics in mixed-farming systems of the West African savanna : a village case study from South Senegal

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Organic matter dynamics in mixed-farming systems of the West African savanna : a village case study from South Senegal ORGANIC MATTER DYNAMICS IN MIXED-FARMING SYSTEMS OF THE WEST AFRICAN SAVANNA A VILLAGE CASE STUDY FROM SOUTH SENEGAL RAPHAËL MANLAY ENVIRONMENT DOCTORAL THESIS ��������� ����������� � ���������� �� � ��� ���� ������� ����� �� �� ������������ ��� ���������� �� ��������� ���� ��� � �������� ������������������ �� ��� ������� ����� ����������� � �� ��� � !�" � �� ���"�#�������" �$ � �����%��� �������& ��� � ��� �������� � ��� ��� ����� �� ���������� �������������� � ��� � �� �� �� �� ���� ����������� ��� ��������� � � ����������� ����������� �� �!""" #��$%� ���& � � ������'�� ��(�� �)�����% ������* �+�� ,���������- ������ �� ��� ������������� � ���� ������ ����������� 5DSSRUWHXU ������������ ���� 5DSSRUWHXU ����������� � ����� 'LUHFWHXU GH 7KqVH ���������!�� �� ([DPLQDWHXU ����������� � ����� ([DPLQDWHXU ����! ��������"#� ([DPLQDWULFH ����������������� ([DPLQDWHXU ACKNOWLEDGEMENTS The work reported here is the fruit of personal labour as much as that of a team effort. This owes not only to the holistic essence of the subject, but also to great humane qualities of so many people more or less directly involved in the project. I am very much grateful to Dr Christian Feller for having accepted to supervise this thesis. However constraining our distance and his functions may have been, he brought unfailing scientific support and benevolence to this work. As a soil scientist, he took a gamble on this pluridisciplinary project which benefited from his great open-mindedness. Dr Christian Floret was his counterpart in Senegal to oversee this work. I express special thanks to him for having put his trust in this project and brought any possible scientific, humane and material support needed for this thesis. He and Dr Roger Pontanier welcomed me into the team of the Research program on Fallows in We

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